A2jlg

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31 questions

1

A2 Many molecules (DNA, proteins, carbohydrates etc) are polymers. There are many reasons polymers are so important in biology.
Which is not a correct reason?

Polymers give structural strength

Polymers are more compact than small molecules

Polymers are less soluble and have less impact on osmolarity than small molecules

Polymers often require little energy to assemble/disassemble

Polymers are more chemically reactive than small molecules

A1 Which of the following is present in eukaryotic cells, but is NOT found in prokaryotic cells?

A2 What is the key difference between lipids (fats) and carbohydrates?

A2 In people with diabetes, blood sugar levels may become very high. The kidney usually reabsorbs all the sugar from blood plasma it fliters into urine. However, in diabetic people, the rate of glucose reabsorption in the kidney may become saturated. A Benedict's test used to be used to test the amount of sugar in samples from diabetic people.
Which is order of samples, from left to right, giving the results shown in the test-tubes?

Urine from healthy person; urine from diabetic; blood plasma from diabetic; positive control (glucose)

Urine from diabetic person; urine from healthy person; blood plasma from diabetic; positive control (glucose)

Urine from healthy person; blood plasma from diabetic; urine from diabetic; positive control (glucose)

Blood plasma from healthy person; urine from healthy person; urine from diabetic; positive control (glucose)

Positive control (glucose); urine from diabetic; blood plasma from diabetic; urine from healthy person

Positive control (glucose); blood plasma from diabetic; urine from diabetic; urine from healthy person

A2 Plants use underground tubers to store carbohydrates densely over the winter. Plants pack fruits with sweet tasting carbohydrates to attract animals which will disperse their seeds. Other parts of the plant contain a mix of sugars being transported and metabolised or stored.
An iodine test was used on samples from a plant. Which is order of samples, from left to right, giving the results shown in the test-tubes?

A2 Albumins are soluble proteins present at extremely high concentrations in biological fluids (such as blood). When denatured, albumins loose certain properties, which is why fluids (such as egg whites) set when heated.
What key property do you suppose albumins have?

A2 A Biuret test was carried out on samples from these experiments.
Which is order of samples, from left to right, giving the results shown in the test-tubes?

Protein, protein exposed to pineapple, no protein

Protein, no protein, protein exposed to pineapple

Protein exposed to pineapple, protein, no protein

Protein exposed to pineapple, no protein, protein

No protein, protein, protein exposed to pineapple

No protein, protein exposed to pineapple, protein

A2 Various forces are important in the interactions contributing to the tertiary structure of a protein.
The figure below is a diagram showing several possible interactions.
Which of the following letters represent the correct names for each type of interaction?

A

B

C

D

A2 In which of the following polymers would you find alpha glucose joined only by 1,4 glycosidic bonds?

Amylopectin

Amylose

Cellulose

Glycogen

A2 Four different concentrations of glucose solution were each tested using Benedict's solution. The same volume of glucose and Benedict's solution was used in each case. After 5 minutes the colour of the precipitate was noted:
Place the samples in increasing order of concentration.

Sample 2: yellow
Sample 4: brick-red
Sample 3: green
Sample 1: orange

A2 The amino acid alanine is shown below.
Which of the following parts of the molecule are the amino group, the carboxyl group and the R (variable) group?

A

B

C

D

A2 Titin is the largest known protein and is a component of muscle. In humans the protein is 34,350 amino acids long.
What is the minimum length of the human gene for titin?

34,350 bases

68,700 bases

103,050 bases

137,400 bases

A2 Which of the following is true of human metabolism?

Fats are not needed except as an energy store

Fats can be used in anaerobic respiration

Proteins cannot be used as an energy source

Storing sugar results in more retention of water than storing fat

Sugars provide more energy than fat because they are less oxidised

A2 Plants use starch to store glucose, whilst animals store glycogen. Starch and glycogen stores have
different properties which reflect the different ways plants and animals function.
Which of the following is NOT a correct explanation of the difference between plant and animal stores?

Animals need to release glucose quicker than plants to contract muscles

Animals store most of their energy as fat

Animals need to store their glucose in a denser form than plants

Animals need to control the concentration of glucose in their fluids more than plants

Animals often synthesise glucose form amino acids

A2 Which of the following elements is NOT present in haemoglobin?

A2 Humans have various stores of chemical energy. We store more of our energy reserves in some chemicals than others.
Put them in order from least energy stored to most energy stored.

ATP
Fat
Blood glucose
Liver glucose
Phospho-creatine
Protein

A2 Plants use starch to store glucose, whilst animals store glycogen. Starch and glycogen stores have different properties which reflect the different ways plants and animals function.
Which of the following is NOT a correct explanation of the difference between plant and animal stores?

Animals need to release glucose quicker than plants to contract muscles

Animals store most of their energy as fat

Animals need to store their glucose in a denser form than plants

Animals need to control the concentration of glucose in their fluids more than plants

Animals often synthesise glucose from amino acids

A2 Many biological substances are polymers of simpler subunits. Condensation reactions join two molecules and water is produced as a product.
Which polymer is NOT produced in a condensation reaction?

A8 The main component of blood plasma is:

A2.2 Complete the answer table to indicate which of the following statements are true (+ ) and which are false (-).

Lipids are a group of compounds that include triglycerides and steroid hormones such as oestrogen and testosterone.

More ATP is produced from complete biological oxidation of one molecule of triglyceride than from one molecule of glucose.

The number of ATP molecules produced per oxygen molecule utilised is greater for complete oxidation of glucose than for fat.

Saturated fats contain fatty acids possessing one or more double bonds between adjacent carbon atoms.

A2 The tiny hairs on a gecko's toes enable it to climb walls. The hairs are made of hydrophobic
keratin and adhere to surfaces via van der Waals interaction. At the tiny interface where the
gecko's toe hairs touch the surface it climbs, which amino acid are you LEAST likely to find?

A2 While preparing to teach an organic chemistry class, Professor Dacb has managed to mix up
several beakers. He has taken samples from each beaker and enlisted your help in identifying them. Below are the results of a series of reagent tests.
Which of the following correctly matches each beaker to its possible contents?

1: Gelatin, 2: Corn oil, 3: A solution of asparagine, 4: A solution of glucose, 5: A solution of sucrose

1: Gelatin, 2: Triglycerides, 3: A solution of asparagine, 4: A solution of sucrose, 5: A solution of glucose

1: A solution of asparagine, 2: Triglycerides, 3: Gelatin, 4: A solution of glucose, 5: A solution of sucrose

1: A solution of sucrose, 2: Corn oil, 3: A solution of glucose, 4: A solution of asparagine, 5: Gelatin

1: A solution of glucose, 2: Triglycerides, 3: A solution of sucrose, 4: A solution of asparagine, 5: Gelatin

A2 Which one of the statements relating to the isoelectric pH of a tetrapeptide is true?

The amino and carboxy/ termini are not charged.

Two internal amino acids of the tetrapeptide cannot have ionizable R groups.

The total net charge is zero.

There are four ionic charges.

Only the amino and carboxyl termini contribute charge.

A2 A growing coleoptile was cut from a plant, frozen, thawed, hung on a position transducer and
subjected to constant force first at pH7 and then at pH5. The following plot was obtained (note that
the vertical line indicates the time at which pH was shifted from 7 to 5).
Which statement explains the increase in growth following transfer from pH7 to pHS?

Acid conditions hydrolysed cellulose microfibrils

Low pH stimulated auxin production

Low pH induced sucrose uptake and so higher turgor

Low pH weakend hydrogen bonding between wall components

A2 Which of the following is responsible for the summer and winter stratification of lakes?

Water is densest at 4°C

Oxygen is most abundant in deeper waters.

Winter ice may carry over until spring thaw.

Stratification is caused by a thermocline.

Stratification always follows the fall and spring turnovers.

A2 A sample of human blood is taken, and it is found that all of the cells are alive. The blood is then frozen at –20°C. One day later the blood is thawed and heated to 37°C and it is found that no cells in the blood are living. Why have the cells died?

The cold temperature inhibited important respiratory enzymes and therefore prevented the cells from releasing energy (ATP).

As the water in the cells froze it expanded, fracturing the cells and hence killing them.

As the serum cooled, ions such as sodium precipitated out, causing an osmotic imbalance between the cells and the serum.

Human cells cannot be expected to survive longer than several hours outside the body, under any conditions.

Cooling the cells down caused their cell membranes to solidify, thus preventing vital cellular processes and the exchange of compounds.

A2 It is often commented that when the air is 30°C and has a relative humidity value of 95% that it "feels" much hotter than when the air is 30°C and has a relative humidity value of 50%. The reason for this is:

high humidity disrupts the ability of the body to accurately detect external heat.

that at 95% relative humidity the air holds more warm water vapour than at 50% humidity, and so the air feels warmer to the skin.

high humidity interferes with heat loss by evaporation which is an important cooling mechanism in humans.

in high humidity, humans have greater difficulty in obtaining oxygen from the water-saturated air, and hence feel more uncomfortable or warmer.

that the body regulates its temperature in an energy demanding and dependent way, and so in humid conditions a greater amount of heat is produced by metabolic activity.

A2 Which property of water is most important to plants living below the surface of water in ponds?

A2.31 The structural level of a protein least affected by a disruption in hydrogen bonding is:

A2.22 The hydrolysis of a triglyceride leads to which of the following:
1. products which are less soluble in water than are triglycerides
2. an increase in pH
3. a decrease in pH

A2.31 A2.21 Which of the following statements are true of both cellulose and protein?
1. They may be used as an energy source by certain organisms
2. They are polymers of large molecular mass
3. They act as structural materials in the cell membrane
4. They are synthesized by a series of condensation reactions

A2 Many molecules (DNA, proteins, carbohydrates etc) are polymers. There are many reasons polymers are so important in biology.
Which is not a correct reason?

Polymers give structural strength

Polymers are more compact than small molecules

Polymers are less soluble and have less impact on osmolarity than small molecules

Polymers often require little energy to assemble/disassemble

Polymers are more chemically reactive than small molecules

A1 Which of the following is present in eukaryotic cells, but is NOT found in prokaryotic cells?

Rigid cell walls.

Membrane bound organelles.

Ribosomes.

DNA.

RNA.

A2 What is the key difference between lipids (fats) and carbohydrates?

Molecular size

Amount of carbon

Amount of nitrogen

Presence of closed rings versus open chains

Amount of oxygen

A2 In people with diabetes, blood sugar levels may become very high. The kidney usually reabsorbs all the sugar from blood plasma it fliters into urine. However, in diabetic people, the rate of glucose reabsorption in the kidney may become saturated. A Benedict's test used to be used to test the amount of sugar in samples from diabetic people.
Which is order of samples, from left to right, giving the results shown in the test-tubes?

Urine from healthy person; urine from diabetic; blood plasma from diabetic; positive control (glucose)

Urine from diabetic person; urine from healthy person; blood plasma from diabetic; positive control (glucose)

Urine from healthy person; blood plasma from diabetic; urine from diabetic; positive control (glucose)

Blood plasma from healthy person; urine from healthy person; urine from diabetic; positive control (glucose)

Positive control (glucose); urine from diabetic; blood plasma from diabetic; urine from healthy person

Positive control (glucose); blood plasma from diabetic; urine from diabetic; urine from healthy person

A2 Plants use underground tubers to store carbohydrates densely over the winter. Plants pack fruits with sweet tasting carbohydrates to attract animals which will disperse their seeds. Other parts of the plant contain a mix of sugars being transported and metabolised or stored.
An iodine test was used on samples from a plant. Which is order of samples, from left to right, giving the results shown in the test-tubes?

Fruit; tuber

Leaf; tuber

Leaf; fruit

Tuber; fruit

Tuber; leaf

A2 Albumins are soluble proteins present at extremely high concentrations in biological fluids (such as blood). When denatured, albumins loose certain properties, which is why fluids (such as egg whites) set when heated.
What key property do you suppose albumins have?

Very large molecular size

Hydrophobic surfaces

Long, fibrous shapes

Approximately neutral pH

Shape mostly maintained by covalent bonds

A2 A Biuret test was carried out on samples from these experiments.
Which is order of samples, from left to right, giving the results shown in the test-tubes?

Protein, protein exposed to pineapple, no protein

Protein, no protein, protein exposed to pineapple

Protein exposed to pineapple, protein, no protein

Protein exposed to pineapple, no protein, protein

No protein, protein, protein exposed to pineapple

No protein, protein exposed to pineapple, protein

A2 Various forces are important in the interactions contributing to the tertiary structure of a protein.
The figure below is a diagram showing several possible interactions.
Which of the following letters represent the correct names for each type of interaction?

A

B

C

D

A2 In which of the following polymers would you find alpha glucose joined only by 1,4 glycosidic bonds?

Amylopectin

Amylose

Cellulose

Glycogen

A2 Four different concentrations of glucose solution were each tested using Benedict's solution. The same volume of glucose and Benedict's solution was used in each case. After 5 minutes the colour of the precipitate was noted:
Place the samples in increasing order of concentration.

Sample 2: yellow

Sample 4: brick-red

Sample 3: green

Sample 1: orange

A2 The amino acid alanine is shown below.
Which of the following parts of the molecule are the amino group, the carboxyl group and the R (variable) group?

A

B

C

D

A2 Titin is the largest known protein and is a component of muscle. In humans the protein is 34,350 amino acids long.
What is the minimum length of the human gene for titin?

34,350 bases

68,700 bases

103,050 bases

137,400 bases

A2 Which of the following is true of human metabolism?

Fats are not needed except as an energy store

Fats can be used in anaerobic respiration

Proteins cannot be used as an energy source

Storing sugar results in more retention of water than storing fat

Sugars provide more energy than fat because they are less oxidised

A2 Plants use starch to store glucose, whilst animals store glycogen. Starch and glycogen stores have
different properties which reflect the different ways plants and animals function.
Which of the following is NOT a correct explanation of the difference between plant and animal stores?

Animals need to release glucose quicker than plants to contract muscles

Animals store most of their energy as fat

Animals need to store their glucose in a denser form than plants

Animals need to control the concentration of glucose in their fluids more than plants

Animals often synthesise glucose form amino acids

A2 Which of the following elements is NOT present in haemoglobin?

Iron

Oxygen

Nitrogen

Phosphorus

Hydrogen

A2 Humans have various stores of chemical energy. We store more of our energy reserves in some chemicals than others.
Put them in order from least energy stored to most energy stored.

ATP

Fat

Blood glucose

Liver glucose

Phospho-creatine

Protein

A2 Plants use starch to store glucose, whilst animals store glycogen. Starch and glycogen stores have different properties which reflect the different ways plants and animals function.
Which of the following is NOT a correct explanation of the difference between plant and animal stores?

Animals need to release glucose quicker than plants to contract muscles

Animals store most of their energy as fat

Animals need to store their glucose in a denser form than plants

Animals need to control the concentration of glucose in their fluids more than plants

Animals often synthesise glucose from amino acids

A2 Many biological substances are polymers of simpler subunits. Condensation reactions join two molecules and water is produced as a product.
Which polymer is NOT produced in a condensation reaction?

Glycogen

Protein

Cellulose

Triglycerides

DNA

A8 The main component of blood plasma is:

Ca2+

CO2

O2

Urea

Water

A2.2 Complete the answer table to indicate which of the following statements are true (+ ) and which are false (-).

Lipids are a group of compounds that include triglycerides and steroid hormones such as oestrogen and testosterone.

More ATP is produced from complete biological oxidation of one molecule of triglyceride than from one molecule of glucose.

The number of ATP molecules produced per oxygen molecule utilised is greater for complete oxidation of glucose than for fat.

Saturated fats contain fatty acids possessing one or more double bonds between adjacent carbon atoms.

A2 The tiny hairs on a gecko's toes enable it to climb walls. The hairs are made of hydrophobic
keratin and adhere to surfaces via van der Waals interaction. At the tiny interface where the
gecko's toe hairs touch the surface it climbs, which amino acid are you LEAST likely to find?

A

B

C

D

E

A2 While preparing to teach an organic chemistry class, Professor Dacb has managed to mix up
several beakers. He has taken samples from each beaker and enlisted your help in identifying them. Below are the results of a series of reagent tests.
Which of the following correctly matches each beaker to its possible contents?

1: Gelatin, 2: Corn oil, 3: A solution of asparagine, 4: A solution of glucose, 5: A solution of sucrose

1: Gelatin, 2: Triglycerides, 3: A solution of asparagine, 4: A solution of sucrose, 5: A solution of glucose

1: A solution of asparagine, 2: Triglycerides, 3: Gelatin, 4: A solution of glucose, 5: A solution of sucrose

1: A solution of sucrose, 2: Corn oil, 3: A solution of glucose, 4: A solution of asparagine, 5: Gelatin

1: A solution of glucose, 2: Triglycerides, 3: A solution of sucrose, 4: A solution of asparagine, 5: Gelatin

A2 Which one of the statements relating to the isoelectric pH of a tetrapeptide is true?

The amino and carboxy/ termini are not charged.

Two internal amino acids of the tetrapeptide cannot have ionizable R groups.

The total net charge is zero.

There are four ionic charges.

Only the amino and carboxyl termini contribute charge.

A2 A growing coleoptile was cut from a plant, frozen, thawed, hung on a position transducer and
subjected to constant force first at pH7 and then at pH5. The following plot was obtained (note that
the vertical line indicates the time at which pH was shifted from 7 to 5).
Which statement explains the increase in growth following transfer from pH7 to pHS?

Acid conditions hydrolysed cellulose microfibrils

Low pH stimulated auxin production

Low pH induced sucrose uptake and so higher turgor

Low pH weakend hydrogen bonding between wall components

A2 Which of the following is responsible for the summer and winter stratification of lakes?

Water is densest at 4°C

Oxygen is most abundant in deeper waters.

Winter ice may carry over until spring thaw.

Stratification is caused by a thermocline.

Stratification always follows the fall and spring turnovers.

A2 A sample of human blood is taken, and it is found that all of the cells are alive. The blood is then frozen at –20°C. One day later the blood is thawed and heated to 37°C and it is found that no cells in the blood are living. Why have the cells died?

The cold temperature inhibited important respiratory enzymes and therefore prevented the cells from releasing energy (ATP).

As the water in the cells froze it expanded, fracturing the cells and hence killing them.

As the serum cooled, ions such as sodium precipitated out, causing an osmotic imbalance between the cells and the serum.

Human cells cannot be expected to survive longer than several hours outside the body, under any conditions.

Cooling the cells down caused their cell membranes to solidify, thus preventing vital cellular processes and the exchange of compounds.

A2 It is often commented that when the air is 30°C and has a relative humidity value of 95% that it "feels" much hotter than when the air is 30°C and has a relative humidity value of 50%. The reason for this is:

high humidity disrupts the ability of the body to accurately detect external heat.

that at 95% relative humidity the air holds more warm water vapour than at 50% humidity, and so the air feels warmer to the skin.

high humidity interferes with heat loss by evaporation which is an important cooling mechanism in humans.

in high humidity, humans have greater difficulty in obtaining oxygen from the water-saturated air, and hence feel more uncomfortable or warmer.

that the body regulates its temperature in an energy demanding and dependent way, and so in humid conditions a greater amount of heat is produced by metabolic activity.

A2 Which property of water is most important to plants living below the surface of water in ponds?

Cohesion

Oxygen solubility

High surface tension

Transparency

High latent heat of fusion

A2.31 The structural level of a protein least affected by a disruption in hydrogen bonding is:

primary level

secondary level

tertiary level

quaternary level

all structural levels are equally affected

A2.22 The hydrolysis of a triglyceride leads to which of the following:
products which are less soluble in water than are triglycerides
an increase in pH
a decrease in pH

1 only;

2 only;

3 only;

1 & 2;

1 & 3;

A2.31 A2.21 Which of the following statements are true of both cellulose and protein?
They may be used as an energy source by certain organisms
They are polymers of large molecular mass
They act as structural materials in the cell membrane
They are synthesized by a series of condensation reactions

1 & 2;

2 & 3;

3 & 4;

1, 2 & 3;

1, 2 & 4.

A2jlg

A2jlg

A2 Many molecules (DNA, proteins, carbohydrates etc) are polymers. There are many reasons polymers are so important in biology.Which is not a correct reason?

A1 Which of the following is present in eukaryotic cells, but is NOT found in prokaryotic cells?

A2 What is the key difference between lipids (fats) and carbohydrates?

A2 Albumins are soluble proteins present at extremely high concentrations in biological fluids (such as blood). When denatured, albumins loose certain properties, which is why fluids (such as egg whites) set when heated.What key property do you suppose albumins have?

A2 A Biuret test was carried out on samples from these experiments.Which is order of samples, from left to right, giving the results shown in the test-tubes?

A2 Various forces are important in the interactions contributing to the tertiary structure of a protein.The figure below is a diagram showing several possible interactions.Which of the following letters represent the correct names for each type of interaction?

A2 In which of the following polymers would you find alpha glucose joined only by 1,4 glycosidic bonds?

A2 Four different concentrations of glucose solution were each tested using Benedict's solution. The same volume of glucose and Benedict's solution was used in each case. After 5 minutes the colour of the precipitate was noted:Place the samples in increasing order of concentration.

A2 The amino acid alanine is shown below.Which of the following parts of the molecule are the amino group, the carboxyl group and the R (variable) group?

A2 Titin is the largest known protein and is a component of muscle. In humans the protein is 34,350 amino acids long.What is the minimum length of the human gene for titin?

A2 Which of the following is true of human metabolism?

A2 Plants use starch to store glucose, whilst animals store glycogen. Starch and glycogen stores havedifferent properties which reflect the different ways plants and animals function.Which of the following is NOT a correct explanation of the difference between plant and animal stores?

A2 Which of the following elements is NOT present in haemoglobin?

A2 Humans have various stores of chemical energy. We store more of our energy reserves in some chemicals than others.Put them in order from least energy stored to most energy stored.

A2 Plants use starch to store glucose, whilst animals store glycogen. Starch and glycogen stores have different properties which reflect the different ways plants and animals function.Which of the following is NOT a correct explanation of the difference between plant and animal stores?

A2 Many biological substances are polymers of simpler subunits. Condensation reactions join two molecules and water is produced as a product.Which polymer is NOT produced in a condensation reaction?

A8 The main component of blood plasma is:

A2.2 Complete the answer table to indicate which of the following statements are true (+ ) and which are false (-).

A2 The tiny hairs on a gecko's toes enable it to climb walls. The hairs are made of hydrophobickeratin and adhere to surfaces via van der Waals interaction. At the tiny interface where thegecko's toe hairs touch the surface it climbs, which amino acid are you LEAST likely to find?

A2 Which one of the statements relating to the isoelectric pH of a tetrapeptide is true?

A2 Which of the following is responsible for the summer and winter stratification of lakes?

A2 A sample of human blood is taken, and it is found that all of the cells are alive. The blood is then frozen at –20°C. One day later the blood is thawed and heated to 37°C and it is found that no cells in the blood are living. Why have the cells died?

A2 It is often commented that when the air is 30°C and has a relative humidity value of 95% that it "feels" much hotter than when the air is 30°C and has a relative humidity value of 50%. The reason for this is:

A2 Which property of water is most important to plants living below the surface of water in ponds?

A2.31 The structural level of a protein least affected by a disruption in hydrogen bonding is:

A2.22 The hydrolysis of a triglyceride leads to which of the following:1. products which are less soluble in water than are triglycerides2. an increase in pH3. a decrease in pH

A2 Many molecules (DNA, proteins, carbohydrates etc) are polymers. There are many reasons polymers are so important in biology.
Which is not a correct reason?

A2 Albumins are soluble proteins present at extremely high concentrations in biological fluids (such as blood). When denatured, albumins loose certain properties, which is why fluids (such as egg whites) set when heated.
What key property do you suppose albumins have?

A2 A Biuret test was carried out on samples from these experiments.
Which is order of samples, from left to right, giving the results shown in the test-tubes?

A2 Various forces are important in the interactions contributing to the tertiary structure of a protein.
The figure below is a diagram showing several possible interactions.
Which of the following letters represent the correct names for each type of interaction?

A2 Four different concentrations of glucose solution were each tested using Benedict's solution. The same volume of glucose and Benedict's solution was used in each case. After 5 minutes the colour of the precipitate was noted:
Place the samples in increasing order of concentration.

A2 The amino acid alanine is shown below.
Which of the following parts of the molecule are the amino group, the carboxyl group and the R (variable) group?

A2 Titin is the largest known protein and is a component of muscle. In humans the protein is 34,350 amino acids long.
What is the minimum length of the human gene for titin?

A2 Plants use starch to store glucose, whilst animals store glycogen. Starch and glycogen stores have
different properties which reflect the different ways plants and animals function.
Which of the following is NOT a correct explanation of the difference between plant and animal stores?

A2 Humans have various stores of chemical energy. We store more of our energy reserves in some chemicals than others.
Put them in order from least energy stored to most energy stored.

A2 Plants use starch to store glucose, whilst animals store glycogen. Starch and glycogen stores have different properties which reflect the different ways plants and animals function.
Which of the following is NOT a correct explanation of the difference between plant and animal stores?

A2 Many biological substances are polymers of simpler subunits. Condensation reactions join two molecules and water is produced as a product.
Which polymer is NOT produced in a condensation reaction?

A2 The tiny hairs on a gecko's toes enable it to climb walls. The hairs are made of hydrophobic
keratin and adhere to surfaces via van der Waals interaction. At the tiny interface where the
gecko's toe hairs touch the surface it climbs, which amino acid are you LEAST likely to find?

A2.22 The hydrolysis of a triglyceride leads to which of the following:
1. products which are less soluble in water than are triglycerides
2. an increase in pH
3. a decrease in pH