Which property of water allows it to move upward from the roots of a tree to its leaves?
High specific heat
High heat of vaporization
Cohesion
Solvent of life
Hydrophobic properties
There are several emergent properties of water that contribute its powerful affect on living organisms. These emerging properties are mostly due to:
Water's ability to expand when frozen
The abundance of water on Earth
Water's ability to moderate pH
The buffering ability of water
The hydrogen bonds linking water molecules together
What determines the polarity of a molecule?
The number of atoms in the molecule
The symmetry and electronegativity difference between atoms in the molecule
The molecular weight of the compound
The physical state of the molecule (solid, liquid, gas)
The total number of bonds in the molecule
Which property of water would be most affected if hydrogen bonding did not occur?
Its boiling point
Its mass
Its atomic composition
Its pH level
Its radioactivity
How does the hydrogen bonding in water affect its role as a solvent in chemical reactions?
It makes water reactive with all substances it dissolves
It has zero effect on water's solvent properties
It makes water unable to dissolve any substances
It enables water to act as a universal solvent for many polar and ionic compounds
It allows water to dissolve only non-polar molecules
Which type of chemical bond involves the transfer of electrons from one atom to another, resulting in oppositely charged ions that are attracted to each other?
Covalent bond
Ionic bond
Hydrogen bond
Van der Waals interactions
Peptide bond
Which of the following molecules is a carbohydrate?
Palmitic acid
Amino acid
Collagen
Lactose
Insulin
Which of the following in NOT a class of organic compounds that are central to life on Earth:
Water
Proteins
Nucleic acids
Lipids
Carbohydrates
Which of the following combination is TRUE
Dehydration synthesis breaks apart amino acids and hydrolysis bonds them together
Hydrolysis and Dehydration synthesis are similar because they both bond amino acids by a peptide bond
Dehydration synthesis bonds amino acids while hydrolysis breaks bonds apart.
Dehydration synthesis and hydrolysis are similar because they both break amino acids apart by removing water molecules
Dehydration synthesis add hydrogen bonds to hydrolic amino acids
What is the primary characteristic that distinguishes organic compounds from inorganic compounds?
The presence of carbon-hydrogen bonds
The ability to conduct electricty
The presence of ionic bonds
The ability to form crystals
The presence of metallic elements
Which of the following would have the highest pH
Pure water
Soap
Orange juice
Lemonade
Milk
Which of the following is NOT a monosaccharide?
Glucose
Fructose
Galactose
Sucrose
Ribose
In a solution of pH 12, what can you conclude about its acidity and ion concentration?
It's a strong base with high hydroxide ion concentration
It's a strong acid with high hydrogen ion concentration and low hydroxide ion concentration
It's a neutral solution with equal hydrogen and hydroxide ion concentrations
It's a weak acid with moderate hydrogen ion concentration
The pH value alone is not sufficient to draw conclusions about ion concentrations
What is the main structural difference between ribose and deoxyribose?
Ribose has more carbon atoms than dexyribose
Ribose contains and additional hydroxyl group (-OH) compared to deoxyribose
Deoxyribose has a double bond in its structure, whereas ribose does not
Ribose is found only in DNA, while deoxyribose is found only in RNA
Ribose is a six-carbon sugar while deoxyribose is a five-carbon sugar
There are four levels of protein structure. Which level includes the coils of the α helix and the folds of the β pleated sheets?
Primary structure
Secondary structure
Tertiary structure
Quaternary structure
Every protein level include α helix and β pleated sheets
What is the best definition of a monomer?
A small molecule that can bond to other identical molecules to form a polymer
A large molecule made up of repeating units
A molecule that breaks down into simpler substances during chemical reactions
A molecule that exists in a gaseous state at room temperature
A molecule that does not react with other molecules in a chemical reaction
Which functional group(s) in amino acids is involved in forming peptide bonds during protein synthesis? (CHOOSE TWOOOOOOO)
Carboxyl group
R-group
Hydrogen atom
Hydroxyl group
Amino group
What is the role of the R-group (side chain) in amino acids?
It determines the amino acid's hydrophobicity only
It contributes to the acidic properties of the amino acid
It defines the chemical identity and properties of each amino acid
It forms the peptide bonds between amino acids
It is the site where amino acids bond to form polymers
Which of the following statements about the hydrogen atom in an amino acid is true?
It determines the amino acid's acidic nature
Which of the following statements about the hydrogen atom in an amino acid is true?
It provides a reference point for determining the amino acid's unique make up.
It differentiates amino acids from one another
it affects the overall charge of the amino acid
What is the name of the bond that forms between the carboxyl group of one amino acid and the amino group of another?
Hydrogen bond
Ionic bond
Covalent bond
Chaperone bond
Peptide bond
What defines the primary structure of a protein?
The overall 3D shape of the protein
The sequence of amino acids in a polypeptide chain
The folding pattern of alpha-helices and beta-sheets
The interaction between multiple polypeptide chains
The location of disulfide bonds in the protein
What type of bonding is primarily responsible for the secondary structure of proteins?
Disulfide bonds
Ionic bonds
Hydrogen bonds
Peptide bonds
Hydrophobic interactions
Which of the following is an example of a secondary structure in proteins?
Disulfide bridges
Alpha-helices and beta-sheets
The arrangement of polypeptide subunits
The linear sequence of amino acids
Hydrophobic core formation
The tertiary structure of a protein is determined by:
The folding of the protein into a three-dimensional shape due to side chain interactions
The interaction of multiple protein subunits
B) Hydrogen bonding between amino and carboxyl groups
The sequence of amino acids in the protein
The formation of peptide bonds
The interaction of multiple protein subunits
What determines the function of a protein?
The number of peptide bonds
The types of side chains
The protein's specific structure
The tissue that produces the protein
The first amino acid
Lipids (such as triglycerides) has primary functions of all the following EXCEPT:
Energy storage
Source of production
Communication between molecules
Cell membrane formation
Hormone production
Triglycerides are made of a glycerol backbone with three fatty acid chains that are bonded together by removing three molecules of water which means it is bonded together by:
Hydrolysis
Dehydration synthesis
Glyceroid bond
Lipidial bond
None of the above
Which of the following do nucleic acids NOT contain?
Iron
Phosphate
Carbon
Nitrogen
Oxygen
What is the primary difference between saturated and unsaturated fats?
The number of carbon atoms in their fatty acid chains
The presence or absence of double bonds in their fatty acids
The number of glycerol molecules they contain
Their solubility in water
The type of ester linkage they form
Which of the following macromolecules is made up of amino acid monomers?