Q: Which of the following is a correct summary of the reactants and products of aerobic cellular respiration?

$$ \text{C}_6\text{H}_{12}\text{O}_6 + 6\ \text{O}_2 \rightarrow 6\ \text{CO}_2 + 6\ \text{H}_2\text{O} + \text{ATP} $$

Question 1

Which of the following best describes the relationship between photosynthesis and cellular respiration in the global carbon cycle?

Accepted Answer

Photosynthesis converts carbon dioxide into glucose, and cellular respiration breaks down glucose to release carbon dioxide.

Question 2

During aerobic cellular respiration, what is the net ATP yield from one molecule of glucose?

Accepted Answer

$$ 38 $$

Question 3

Which of the following statements about the electron transport chain (ETC) is correct?

Accepted Answer

The ETC consists of proteins embedded in the inner mitochondrial membrane that transfer electrons and pump protons.

Question 4

Which molecule acts as the final electron acceptor in the electron transport chain during aerobic respiration?

Accepted Answer

Oxygen ($$ O_2$ )$$

Question 5

What is the main purpose of photosynthesis in plants?

Accepted Answer

To convert solar energy into chemical energy stored in glucose

Question 6

Which of the following best explains why oxygen is described as an 'electron grabber' in cellular respiration?

Accepted Answer

Oxygen is highly electronegative and pulls electrons down the electron transport chain, allowing energy to be released.

Question 7

Which of the following correctly matches the stage of cellular respiration with its location in the cell?

Accepted Answer

Electron transport chain – inner mitochondrial membrane

Question 8

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

Accepted Answer

$$ 2 $$ ATP and $$ 2 $$ NADH

Question 9

Which of the following best describes the difference between slow-twitch and fast-twitch muscle fibers?

Accepted Answer

Slow-twitch fibers are adapted for endurance and use aerobic respiration; fast-twitch fibers are adapted for short bursts of power and use anaerobic respiration.

Question 10

Which of the following is a correct summary of the reactants and products of aerobic cellular respiration?

Accepted Answer

$$ 	ext{C}_6	ext{H}_{12}	ext{O}_6 + 6\ 	ext{O}_2 ightarrow 6\ 	ext{CO}_2 + 6\ 	ext{H}_2	ext{O} + 	ext{ATP} $$

Question 11

Which of the following best explains why lactic acid fermentation is considered a 'short-circuit' of aerobic respiration?

Accepted Answer

It allows ATP production to continue in the absence of oxygen by regenerating NAD$$^+$$, but produces much less ATP than aerobic respiration.

Question 12

Which of the following molecules is the reduced form in the NAD$$^+/$$NADH redox pair?

Accepted Answer

NADH

Question 13

Which of the following best describes the role of ATP synthase in cellular respiration?

Accepted Answer

It uses the flow of H$$^+$$ ions down their concentration gradient to synthesize ATP from ADP and inorganic phosphate.

Question 14

Which of the following statements about fermentation is correct?

Accepted Answer

Fermentation allows glycolysis to continue by regenerating NAD$$^+ in $$the absence of oxygen.

Question 15

Which of the following is a primary difference between lactic acid fermentation and alcoholic fermentation?

Accepted Answer

Alcoholic fermentation produces ethyl alcohol and CO$$_2$$, while lactic acid fermentation produces lactic acid and no CO$$_2.$$

Question 16

Which of the following best explains why glycolysis is considered one of the earliest metabolic pathways to have evolved?

Accepted Answer

It occurs in the cytoplasm and does not require oxygen, suggesting it evolved before complex organelles and atmospheric oxygen.

Question 17

Which of the following molecules can enter the aerobic cellular respiration pathway at the citric acid cycle stage?

Accepted Answer

Fatty acids, after being converted to acetyl CoA

Question 18

Which of the following best describes a redox reaction in the context of cellular respiration?

Accepted Answer

A reaction where one molecule is oxidized (loses electrons) and another is reduced (gains electrons).

Question 19

Which of the following is a correct sequence of events in aerobic cellular respiration?

Accepted Answer

Glycolysis $$\rightarrow$$ Citric Acid Cycle $$\rightarrow$$ Electron Transport Chain

Question 20

Which of the following best explains why oxygen is essential for the survival of aerobic organisms?

Accepted Answer

Oxygen acts as the final electron acceptor in the electron transport chain, allowing for efficient ATP production.

Cellular Respiration & Photosynthesis Study Guide – Step-by-Step Guidance

Study Guide - Practice Questions

Study Guide - Flashcards