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Copy of CK12 1.15- 1.18 (2/1/2024)

Last updated over 2 years ago

52 questions

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1.18

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1.15- 1.18

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Question 2

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Question 3

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Question 4

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Question 5

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Question 6

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Question 7

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Question 8

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Question 9

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Question 10

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Question 11

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Question 12

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Question 13

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Question 14

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Question 15

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Question 16

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Question 17

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Question 18

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Question 19

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Question 20

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Question 21

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Question 26

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Question 27

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Question 28

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Question 30

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Question 31

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Question 35

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Question 36

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Question 37

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Question 48

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Question 50

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Question 51

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Question 52

52.

What happens in an exothermic reaction?

Energy is released

Energy is stored

Reactants are cooled

Heat is absorbed

What is the general chemical equation for an exothermic reaction?

Reactants + Products → Heat

Heat → Reactants + Products

Reactants → Products + Heat

Reactants + Heat → Products

What is an example of an exothermic reaction?

Evaporation

Photosynthesis

Chlorine combining with sodium

Distillation

What is a chemical reaction that absorbs energy called?

Exothermic reaction

Endothermic reaction

Photosynthetic reaction

Kinetic reaction

What is the general chemical equation for an endothermic reaction?

Reactants + Products → Heat

Heat → Reactants + Products

Reactants → Products + Heat

Reactants + Heat → Products

Why does a chemical cold pack cool down?

Because of an exothermic reaction

Because of an endothermic reaction

Due to refrigeration

Due to the evaporation of water

What is activation energy in a chemical reaction?

Permanent energy of a reaction

Energy needed to start a reaction

Energy generated by a reaction

Energy released during a reaction

What is activation energy similar to?

The speed of a child on a slide

The push a child needs on a slide

The color of the slide

The height of a slide

Does a chemical reaction continue needing activation energy after it has started?

Only in endothermic reactions

Sometimes

Yes

No

What term describes the sum of all biochemical reactions in an organism?

Respiration

Catalysis

Digestion

Metabolism

Where do biochemical reactions occur in living organisms?

Inside cells

In the bloodstream

On the cellular surface

In the digestive tract

Which two fields of study are needed to fully understand biochemical reactions?

Physics and Chemistry

Biology and Physics

Biology and Chemistry

Chemistry and Geology

Which biochemical reaction breaks down molecules into smaller units?

Anabolic reactions

Endothermic reactions

Catabolic reactions

Exothermic reactions

What type of reaction is the joining of amino acids to form a protein?

Exothermic reactions

Anabolic reactions

Catabolic reactions

Endothermic reactions

Which type of reaction releases energy?

Endothermic reactions

Exothermic reactions

Anabolic reactions

Catabolic reactions

What type of reaction occurs when your body digests food?  Hint: Glucose.

Catabolic reactions

Exothermic reactions

Endothermic reactions

Anabolic reactions

What are biological catalysts in organisms called?

Enzymes

Cells

Proteins

Mitochondria

Why must the rate of most biochemical reactions be increased by a catalyst?

Cell conditions make reactions too slow

To make cells grow faster

To produce more energy

To eliminate waste products faster

What is the main role of enzymes in biochemical reactions?

They slow down reactions.

They create reactions.

They stop reactions.

They speed up reactions.

Are enzymes used up in the reactions they control?

Sometimes they are used up.

No, they are not used up.

Only partially used up.

Yes, they are used up.

How are enzymes different from other catalysts?

Enzymes are not catalysts.

Enzymes are slower.

Enzymes can't be reused.

Enzymes are highly specific for certain reactions.

What is the efficiency of enzymes in catalyzing reactions?

They catalyze a single reaction per hour.

They catalyze hundreds of reactions per day.

They can catalyze millions of reactions per second.

They catalyze a few reactions per minute.

What role do enzymes play in biochemical reactions?

They speed up biochemical reactions

They slow down biochemical reactions

They stop biochemical reactions

They do not affect biochemical reactions

What is activation energy in the context of biochemical reactions?

Energy needed to start a chemical reaction

Energy released during a reaction

Energy absorbed during a reaction

The total energy in a reaction

Which phrase best describes a catalyst?

Substance that ends a chemical reaction

Substance that initiates a chemical reaction

Substance that speeds up a chemical reaction

Substance that slows a chemical reaction

What are the products of a combustion reaction involving glucose and oxygen?

Glucose and oxygen

Carbon and hydrogen

Carbon dioxide and water

Water and oxygen

What happens to the activation energy in the presence of an enzyme?

It remains the same

It is eliminated

It decreases

It increases

What is the role of enzymes in a chemical reaction?

Does not affect the reaction

Slows down the reaction

Speeds up the reaction

Stops the reaction

What is released during a combustion reaction of glucose and oxygen?

Glucose

Energy

Carbon Dioxide

Oxygen

What is the role of enzymes in a biological reaction?

They lower activation energy

They stop the reaction

They have no role

They increase reaction energy

What is the name given to the reactant molecules enzymes bind?

Product

Mixture

Solution

Substrate

Where do enzymes bind reactant molecules?

In the substrate

Around the enzyme

On the passive site

On the active site

How do enzymes position reactants for a reaction?

Correctly to overcome intermolecular forces

Far apart to increase activation energy

Incorrectly to produce more energy

Close together for proper collision

What is the term for the molecule that binds an enzyme at its active site?

Solution

Reactant

Catalyst

Substrate

What occurs when an enzyme and substrate form a complex?

It stops the reaction

It slows down the reaction

It catalyzes a reaction

It freezes the reaction

What happens to the products after a biochemical reaction on the enzyme's active site?

They destroy the enzyme

They bind permanently

They are released

They become a new enzyme

What factors can influence the activities of enzymes?

Light intensity

Magnetic field

Gravity

Temperature, pH, ionic conditions

Which enzyme functions best in the acidic environment of the stomach?

Pepsin

Lipase

Trypsin

Amylase

What is the optimal pH for the activity of pepsin?

6.5

8

7

1.5

Trypsin operates optimally in which part of the digestive system?

Stomach

Mouth

Small Intestine

Large Intestine

What happens to most enzymes at temperatures higher than 98.6˚F?

They multiply

They become more functional

Their shape deteriorates

Their size increases

Chemical reactions do not necessarily involve energy.

True

False

An endothermic reaction is one that absorbs energy.

True

False

The activation energy is the energy used to end a chemical reaction.

True

False

Exothermic reactions absorb energy from surroundings.

True

False

Biochemical reactions are chemical reactions that take place inside the cells of organisms.

True

False

All chemical reactions in an organism need enzymes to take place.

True

False

Biological catalysts that speed up biochemical reactions are known as enzymes.

True

False

Enzymes increase the activation energy required to start biochemical reactions.

True

False

Enzymes are unaffected by changes in temperature, ionic conditions or pH.

True

False

The function of an enzyme is not dependent on its surrounding environment.

True

False

Enzymes can help to accelerate biochemical reactions.

True

False