Question

1. Metabolism is best defined as the _________.

A. Reactions of living cells

B. Reactions that synthesize large molecules in living cells

C. Reactions that degrade molecules in living cells

D. Conversion of food molecules to energy

E. Reactions that synthesize and/or degrade molecules in living cells

2. Which of the following groups of molecules can participate in a hydrogen bond as a hydrogen bond donor?

A. NH3 +

B. CH3

C. C=O

D. C=N-C

3. Which of the following is not a component of nucleic acid?

A. Nucleotides

B. Glucose

C. Phosphate group

D. Purines

E. Pyrimidines

4. Which of the following is not an example of a macromolecule?

A. Nucleic acid

B. Protein

C. Polysaccharide

D. Enzyme

E. Amino acid

5. The ΔG^o of a reaction:

A. will change if the temperature of the reaction is changed.

B. will change if the concentration of reactants and products are changed.

C. can be used to calculate whether a reaction is thermodynamically favorable under defined non-standard conditions.

D. the value alone can directly predict whether a reaction will be thermodynamically favorable under non-standard conditions.

E. is not related to the equilibrium constant.

Answer 1

1) The correct answer is-

E. Reactions that synthesize and/or degrade molecules in living cells

Metabolism is all chemical reactions involved in maintaining the living state of the cells and the organism. It consists of Anabolism (synthesis of molecules) and catabolism (breakdown of large molecules)

2) The correct answer is-

A. NH3 +

The donor in a hydrogen bond is the electronegative atom to which the hydrogen atom participating in the hydrogen bond is covalently bonded.

3)The correct answer is-

B. Glucose

This is because nucleic acids contains- phosphate group, ribose or deoxyribose sugar, nitrogenous base which can be purine or pyrimidine.

4) The correct answer is-

E- amino acid

This is because amino acid is monomer of protein and monomer are the building blocks of the macromolecules