Question 1

Which of the following best describes the role of autotrophs in an ecosystem?

Accepted Answer

They produce organic matter from inorganic substances using energy from sunlight or chemicals.

Question 2

Cellular respiration is summarized by the following equation:
$$
C_6H_{12}O_6$ + 6O_2 ightarrow 6CO_2 + 6H_2O + 	ext{ATP}
$$
What is the primary purpose of this process in cells?

Accepted Answer

To harvest chemical energy from glucose and store it as ATP.

Question 3

Which stage of cellular respiration occurs in the cytoplasm and does not require oxygen?

Accepted Answer

Glycolysis

Question 4

During the electron transport chain, what is the final electron acceptor?

Accepted Answer

Oxygen ($$O_2)$$

Question 5

Which of the following is a correct sequence of the main stages of aerobic cellular respiration?

Accepted Answer

Glycolysis → Citric acid cycle → Electron transport chain

Question 6

What is the role of high-energy electron carriers such as NADH in cellular respiration?

Accepted Answer

They transport electrons to the electron transport chain for ATP production.

Question 7

If a cell is deprived of oxygen, which process will it rely on to generate ATP?

Accepted Answer

Fermentation

Question 8

Which waste product is produced during lactic acid fermentation in muscle cells?

Accepted Answer

Lactic acid

Question 9

In the mitochondrion, ATP synthase produces ATP by utilizing the movement of which ion across the membrane?

Accepted Answer

Hydrogen ions ($$H^+)$$

Question 10

Which of the following statements about heterotrophs is correct?

Accepted Answer

They obtain energy by consuming other organisms.

Question 11

A marathon runner experiences muscle fatigue due to a lack of oxygen. Which metabolic pathway is most responsible for the continued production of ATP under these conditions?

Accepted Answer

Lactic acid fermentation

Question 12

Which of the following best explains why cellular respiration is considered an aerobic process?

Accepted Answer

It requires oxygen to accept electrons at the end of the electron transport chain.

Question 13

Which molecule is oxidized during glycolysis?

Accepted Answer

Glucose ($$C_6H_{12}O_6$)

Question 14

A patient with mitochondrial disease has impaired electron transport chain function. Which consequence is most likely?

Accepted Answer

Decreased ATP production

Question 15

Which process directly produces the most ATP during cellular respiration?

Accepted Answer

Electron transport chain and chemiosmosis

Question 16

In the chemical cycling of an ecosystem, which process converts $$CO_2$$ and $$H_2O$$ into glucose and $$O_2$$?

Accepted Answer

Photosynthesis

Question 17

Which of the following is NOT a product of aerobic cellular respiration?

Accepted Answer

Glucose ($$C_6H_{12}O_6$)

Question 18

A cell is placed in an environment lacking oxygen. Which of the following will most likely increase?

Accepted Answer

Lactic acid accumulation

Question 19

Which of the following best describes the relationship between photosynthesis and cellular respiration in the chemical cycling of an ecosystem?

Accepted Answer

Photosynthesis produces glucose and $$O_2$$, which are used in cellular respiration to generate $$CO_2$$, $$H_2O$$, and ATP.

Question 20

Which of the following is a real-world consequence of fermentation in human muscle cells?

Accepted Answer

Accumulation of lactic acid causing muscle soreness

Cellular Respiration: Obtaining Energy from Food

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