$$2 \text{ ATP}, 2 \text{ NADH}$$

It produces $$2 \text{ ATP}$$, $$6 \text{ NADH}$$, and $$2 \text{ FADH}_2$$ per glucose molecule

Each FADH$$_2$$ molecule yields approximately $$2 \text{ ATP}$$ via the electron transport chain

Question 1

During glycolysis, what is the net gain of ATP and NADH molecules per molecule of glucose?

Accepted Answer

$$2 	ext{ ATP}, 2 	ext{ NADH}$$

Question 2

Which molecule is the final electron acceptor in aerobic respiration?

Accepted Answer

$$O_2$$

Question 3

What is the main purpose of the electron transport chain (ETC) in microbial metabolism?

Accepted Answer

To create a proton gradient for ATP synthesis

Question 4

Which of the following is TRUE regarding the Krebs cycle (Citric Acid Cycle)?

Accepted Answer

It produces $$2 	ext{ ATP}$$, $$6 	ext{ NADH}$$, and $$2 	ext{ FADH}_2$$ per glucose molecule

Question 5

In the absence of oxygen, which process allows cells to regenerate NAD$$^+$$ for glycolysis?

Accepted Answer

Fermentation

Question 6

Which of the following statements about FADH$$_2 is $$correct?

Accepted Answer

Each FADH$$_2$$ molecule yields approximately $$2 	ext{ ATP}$$ via the electron transport chain

Question 7

A bacterium is found to use $$NO_3$$^-$$ as its final electron acceptor. Which type of respiration is this?

Accepted Answer

Anaerobic respiration

Question 8

Which of the following best describes a chemoautotroph?

Accepted Answer

An organism that uses inorganic chemicals for energy and $$CO_2 as a $$carbon source

Question 9

Which step in glycolysis requires an initial investment of ATP?

Accepted Answer

Phosphorylation of glucose to glucose-6-phosphate

Question 10

Why is fermentation necessary for some cells under anaerobic conditions?

Accepted Answer

It regenerates NAD$$^+$$ needed for glycolysis to continue

Question 11

Which of the following is a product of the complete oxidation of glucose in aerobic respiration?

Accepted Answer

$$CO_2$$

Question 12

What is the role of ATP synthase in the electron transport chain?

Accepted Answer

It uses the proton gradient to synthesize ATP from ADP and $$P_i$$

Question 13

Which of the following organisms is a photoautotroph?

Accepted Answer

Cyanobacteria

Question 14

A patient’s muscle cells are deprived of oxygen during intense exercise. Which metabolic pathway is most likely to be active?

Accepted Answer

Lactic acid fermentation

Question 15

Which of the following is NOT a product of the Krebs cycle per glucose molecule?

Accepted Answer

$$4 	ext{ ATP}$$

Question 16

What is the main difference between aerobic and anaerobic respiration?

Accepted Answer

The final electron acceptor: $$O_2 in $$aerobic, other molecules in anaerobic

Question 17

Which process directly produces the most ATP during microbial metabolism?

Accepted Answer

Electron transport chain and oxidative phosphorylation

Question 18

If a cell cannot regenerate NAD$$^+$$, what will happen to glycolysis?

Accepted Answer

Glycolysis will stop due to lack of NAD$$^+$$

Question 19

Which of the following is a common misconception about fermentation?

Accepted Answer

Fermentation produces large amounts of ATP

Microbial Metabolism: Glycolysis and the Krebs Cycle (Chapter 5 Study Notes)

Study Guide - Practice Questions