Q: Which of the following correctly represents the overall chemical equation for photosynthesis?

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

Question 1

Which of the following correctly represents the overall chemical equation for photosynthesis?

Accepted Answer

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

Question 2

During the light-dependent reactions of photosynthesis, which of the following occurs?

Accepted Answer

Water is split, producing oxygen, ATP, and NADPH

Question 3

Which pigment is primarily responsible for absorbing light energy in plants?

Accepted Answer

Chlorophyll a

Question 4

Where in the chloroplast do the light-dependent reactions and the Calvin Cycle occur, respectively?

Accepted Answer

Thylakoid membrane; stroma

Question 5

Which molecule acts as the final electron acceptor in the electron transport chain of cellular respiration?

Accepted Answer

Oxygen ($$\mathrm{O}_2)$$

Question 6

What is the net gain of ATP molecules produced directly by glycolysis from one molecule of glucose?

Accepted Answer

2

Question 7

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

Accepted Answer

A reaction in which electrons are transferred from glucose to oxygen

Question 8

In the 'Mystery of the Seven Deaths' case study, cyanide poisoning led to death because cyanide inhibits which part of cellular respiration?

Accepted Answer

The transfer of electrons to oxygen in the electron transport chain

Question 9

Which of the following is a product of the Calvin Cycle?

Accepted Answer

G3P (glyceraldehyde-3-phosphate)

Question 10

Which process in cellular respiration produces the most ATP per glucose molecule?

Accepted Answer

Oxidative phosphorylation (electron transport chain and chemiosmosis)

Question 11

What is the main purpose of the H$$^+$$ concentration gradient in the electron transport chain?

Accepted Answer

To drive ATP synthesis via ATP synthase

Question 12

Which of the following best explains why fermentation is important for cells under anaerobic conditions?

Accepted Answer

It regenerates NAD$$^+ so $$glycolysis can continue

Question 13

Which of the following is a correct pairing of fermentation type and its main product?

Accepted Answer

Alcoholic fermentation – ethanol

Question 14

During which stage of cellular respiration is carbon dioxide ($$\mathrm{CO}_2) $$produced?

Accepted Answer

Citric acid cycle (Krebs cycle)

Question 15

Which of the following best describes the role of ATP synthase?

Accepted Answer

It uses the flow of H$$^+$$ ions to synthesize ATP from ADP and P$$_i$$

Question 16

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

Accepted Answer

Glycolysis → Pyruvate oxidation → Citric acid cycle → Electron transport chain

Question 17

A student sets up an experiment with floating spinach disks in a solution exposed to light. The disks begin to float as photosynthesis proceeds. What is the best explanation for this observation?

Accepted Answer

Oxygen gas produced during the light reactions accumulates in the disks, causing them to float

Question 18

Which of the following statements about glycolysis is TRUE?

Accepted Answer

It occurs in the cytoplasm and does not require oxygen

Question 19

In the context of photosynthesis, what is the main function of NADPH?

Accepted Answer

It donates electrons and hydrogen to the Calvin Cycle for carbon fixation

Question 20

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

Accepted Answer

It serves as the final electron acceptor, allowing the electron transport chain to continue and ATP to be produced

Photosynthesis and Cellular Respiration: Study Guide and Concept Review

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