CHM-360 Quiz 1-2

If a reaction has a negative ΔG, it is:

• a) Nonspontaneous and endergonic

• b) Spontaneous and exergonic

• c) Nonspontaneous and exothermic

• d) Spontaneous and endergonic

Which of the following is NOT a type of work performed in living systems?

• a) Osmotic

• b) Chemical

• c) Mechanical

• d) Static

Which of the following best describes coupled reactions?

• a) A reaction where energy is used up without any output.

• b) A reaction where a non-spontaneous reaction is driven by a spontaneous one.

• c) A reaction where two reactions occur independently.

• d) A reaction that always results in heat production.

The molecule acting as the reducing agent in the following reaction is:

Glucose+ NAD+→ Pyruvate+ NADH

• a) Glucose

• b) NAD⁺

• c) NADH

• d) Pyruvate

In redox reactions, oxidation refers to:

• a) Gaining electrons

• b) Losing electrons

• c) Increasing hydrogen atoms

• d) Becoming more negatively charged

The Henderson-Hasselbalch equation is used to calculate:

• a) The equilibrium constant of redox reactions

• b) The solubility of a solute

• c) The pH of a buffer solution

• d) The standard free energy change

If a buffer solution has a pKa of 6.4 and the ratio of conjugate base to acid is 10:1, the pH is:

• a) 5.4

• b) 6.4

• c) 7.4

• d) 8.4

What type of reaction is shown in the reaction pathway?

• endothermic reaction
• exothermic reaction

Which of the following functional groups is acidic and donates protons in solution?

• a) Amine (-NH₂)

• b) Carboxyl (-COOH)

• c) Hydroxyl (-OH)

• d) Sulfhydryl (-SH)

Which of the following is NOT a macromolecule?

• a) Proteins

• b) Nucleic acids

• c) Lipids

• d) Cholesterol