Q: Which of the following equations correctly represents the net ATP yield from glycolysis per molecule of glucose?

$$2 \text{ ATP} = 4 \text{ ATP produced} - 2 \text{ ATP consumed}$$

Question 1

Which of the following best describes the main difference between catabolic and anabolic pathways in cellular metabolism?

Accepted Answer

Catabolic pathways release energy by breaking down complex molecules, while anabolic pathways require energy to build complex molecules from simpler ones.

Question 2

Which of the following metabolic strategies is unique to prokaryotes and not found in eukaryotes?

Accepted Answer

Chemolithoautotrophy

Question 3

Which of the following statements about enzymes is correct?

Accepted Answer

Enzymes lower the activation energy ($$E_A) $$but do not affect $$\Delta G.$$

Question 4

A bacterium that uses light as an energy source and organic compounds as a carbon source is classified as a:

Accepted Answer

Photoheterotroph

Question 5

Which of the following best explains why fermentation is necessary under anaerobic conditions?

Accepted Answer

Fermentation regenerates NAD$$^+$$, allowing glycolysis to continue in the absence of a terminal electron acceptor.

Question 6

Which of the following is an example of substrate-level phosphorylation?

Accepted Answer

ATP synthesis during glycolysis

Question 7

In a redox reaction, which molecule acts as the electron donor?

Accepted Answer

The molecule with a more negative reduction potential ($$E_0$$'$$)

Question 8

Which of the following equations correctly represents the net ATP yield from glycolysis per molecule of glucose?

Accepted Answer

$$2 	ext{ ATP} = 4 	ext{ ATP produced} - 2 	ext{ ATP consumed}$$

Question 9

Which of the following best describes the role of NAD$$^+ in $$cellular metabolism?

Accepted Answer

It acts as an electron carrier, accepting electrons during catabolic reactions and becoming reduced to NADH.

Question 10

Which of the following scenarios best illustrates reaction coupling in metabolism?

Accepted Answer

A spontaneous reaction drives a non-spontaneous reaction, resulting in an overall negative $$\Delta G.$$

Question 11

A chemolithoautotroph obtains energy and carbon from which sources?

Accepted Answer

Inorganic compounds and CO$$_2$$

Question 12

Which of the following is true regarding the reduction potential ($$E_0$$'$$) in redox reactions?

Accepted Answer

A molecule with a more negative $$E_0$$'$$ is more likely to donate electrons.

Question 13

Which of the following best explains why glycolysis can occur in both the presence and absence of oxygen?

Accepted Answer

Glycolysis does not require a terminal electron acceptor.

Question 14

Which of the following is a correct statement about the fate of pyruvate under anaerobic conditions in yeast?

Accepted Answer

Pyruvate is converted to ethanol and CO$$_2.$$

Question 15

Which of the following best describes the process of substrate-level phosphorylation?

Accepted Answer

ATP is produced directly by transferring a phosphate group from a high-energy substrate to ADP.

Question 16

Which of the following is a true statement about the diversity of fermentation in microbes?

Accepted Answer

Different microbes produce a variety of fermentation products, some of which are useful and some undesirable.

Question 17

Which of the following best describes the role of ATP in cellular metabolism?

Accepted Answer

ATP is an activated carrier that couples exergonic and endergonic reactions.

Question 18

Which of the following is a correct example of a chemolithotroph?

Accepted Answer

An organism that oxidizes H$$_2S $$for energy.

Question 19

Which of the following best explains why enzymes are essential for life?

Accepted Answer

They allow reactions that would otherwise be too slow to proceed rapidly enough to sustain life.

Metabolic Strategies and Energy Flow in Microorganisms

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