Question 1

Which of the following best describes the structure of a biological membrane?

Accepted Answer

Two layers of phospholipids with proteins either spanning the layers or on the surface of the layers.

Question 2

Which molecule will diffuse most rapidly across a pure phospholipid bilayer membrane?

Accepted Answer

O$$_2$$

Question 3

A correct distinction between facilitated diffusion and active transport is that:

Accepted Answer

Facilitated diffusion depends on an existing energy gradient acting on the transported substance, while active transport makes such a gradient.

Question 4

You are studying a pump protein in the lab. What should you add to ensure the pump will operate?

Accepted Answer

ATP

Question 5

Which of the following factors would tend to increase membrane fluidity?

Accepted Answer

A greater proportion of unsaturated phospholipids

Question 6

Which of the following statements about enzymes is correct?

Accepted Answer

Enzymes decrease the activation energy barrier.

Question 7

A reaction has a $$\Delta G of$$ $$-5.6$$ kcal/mol. Which of the following would most likely be true?

Accepted Answer

The reaction would proceed by itself but might be very slow.

Question 8

Vioxx and other NSAIDs are potent inhibitors of the cyclooxygenase-2 (COX-2) enzyme. High substrate concentrations reduce the efficacy of inhibition by these drugs. These drugs are:

Accepted Answer

Competitive inhibitors.

Question 9

Which of the following metabolic processes can occur without a net influx of energy from some other process?

Accepted Answer

$$\mathrm{C_6H_{12}O_6$} + 6\ \mathrm{O_2$} \rightarrow 6\ \mathrm{CO_2$} + 6\ \mathrm{H_2O}$$

Question 10

If you removed the inner membrane of the mitochondrion, could the cell produce any ATP from glucose?

Accepted Answer

Yes, by glycolysis

Question 11

Which of the following is NOT an immediate net product of the typical mitochondrial electron transport chain?

Accepted Answer

ATP

Question 12

Which of the following sequences correctly represents the flow of electrons during photosynthesis?

Accepted Answer

H$$_2O$$ $$\rightarrow$$ NADPH $$\rightarrow$$ Calvin cycle

Question 13

In mechanism, photophosphorylation is most similar to:

Accepted Answer

Oxidative phosphorylation in cellular respiration.

Question 14

Which checkpoint ensures that each of the chromosomes is appropriately attached to spindle fibers in order to segregate properly during the cell cycle?

Accepted Answer

Metaphase checkpoint

Question 15

The decline of MPF (Maturation Promoting Factor) activity at the end of mitosis is due to:

Accepted Answer

The degradation of cyclin.

Question 16

A change in the coding region of a gene can lead to a new allele for that gene. Which property of the protein, coded for by this new allele, could be changed as a result?

Accepted Answer

All of the above could be altered by mutations.

Question 17

Suppose you are preparing to visit a space station that uses photosynthesis to provide you with oxygen. What color lightbulbs should you take with you to maximize oxygen production?

Accepted Answer

Red and blue

Question 18

Which of the following best links photosynthesis and cellular respiration?

Accepted Answer

Chemiosmosis

Question 19

Which phase is the non-dividing phase of mammalian cells?

Accepted Answer

G0

Question 20

Which of the following statements is TRUE regarding the cell cycle?

Accepted Answer

Chromosome replication occurs during S phase.

General Biology Exam 2 Practice – Step-by-Step Study Guidance

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