Which of the following biological molecules contain peptide bonds?

a. Proteins

b. Carbohydrates

c. Lipids

d. Nucleic Acids

A

B

C

D

B

Which one is…1.a lipid2.a nucleotide3.an amino acid4.a carbohydrate

What is the function of chaperonin proteins?a. Denaturation of polypeptides

b. Assembling amino acids

c. Regulation of gene expression

d. Folding proteins

e. None of the above

Which amino acid is responsible for the formation of disulfide bonds?

a. Alanine

b. Proline

c. Tyrosine

d. Cysteine

e. Isoleucine

Which amino acid would be considered basic? a. Alanine

b. Lysine

c. Tyrosine

d. Cysteine

e. Isoleucine

Which amino acid would be considered acidic? a. Alanine

b. Lysine

c. Tyrosine

d. Glutamate

e. Isoleucine

The addition of water to break a chemical bond is termed –

a. Dehydration synthesis

b. Hydrolysis

c. Condensation

d. Catabolism

e. Disassociation

Which of the following is not a function of proteins?

a. Coding for polypeptides

b. Catalyzes chemical reactions

c. Transport of material

d. Structural components of tissues

e. All of the above are protein functions

Each strand of DNA contains nucleotides that are covalently bonded together through polymerization. These connecting bonds are called phosphodiester bonds.

a. This is true

b. This is false

The energy in carbohydrates is stored in the C-H bonds.

a. This is true

b. This is false

If a chromosome contains 20% thymine, how much guanine should it have?

a. 10%

b. 20%

c. 30%

d. 40%

Which of the following is an amino group?a. -OH

b. -C=O

c. -COOH

d. -SH

e. -NH2

Dehydration synthesis –a. Is used to link monomers

b. Removes water to form bonds

c. Is involved in protein synthesis

d. Can form disaccharides

e. All of the above

Lincosamides are a class of antibiotics that inhibit peptide bond formation. What type of biological molecule would be affected?

a. Lipids

b. Proteins

c. Nucleic Acids

d. Carbohydrates

A person is lactose intolerant. What type of molecule is lactose?

a. Monosaccharide

b. Disaccharide

c. Oligosaccharide

d. Polysaccharide

If a strand of DNA has a sequence

5’-ATCCTAG-3’, what would be the complementary sequence?

a. 5’-CGAAGAT-3’

b. 5’-TAGGATC-3’

c. 3’-TAGGATC-5’

d. 3’-CGAAGTC-5’

If a cell was grown in a growth medium that has a radioactive sulfur isotope which class of biomolecules will show the presence of the isotope?a. Nucleic acids

b. Carbohydrates

c. Lipids

d. Proteins

How can changes in pH affect protein structure?

A.By causing hydrolysis of the peptide bondB.By changing the charges on certain amino acid sidechainsC.By breaking the sidechains off of the alpha carbonsD.By joining proteins together in long chains

This would be : A. beta sheet; B. alpha helix; C. nucleic acid; D. lipid

This would be : A. beta sheet; B. alpha helix; C. nucleic acid; D. lipid

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• Most biological buffers consist of a pair of molecules, one an acid and one a base

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Chemical reactions

• Chemical reactions involve the formation or breaking of chemical bonds

• Atoms shift from one molecule to another without any change in number or identity of atoms

• Reactants = original molecules• Products = molecules resulting from reaction

6H2O + 6CO2 → C6H12O6 + 6O2

reactants products

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• Extent of chemical reaction influenced by1. Temperature2. Concentration of reactants and products3. Catalysts

• Many reactions are reversible