Unit 3: Cellular Energetics

Based on the data, which wavelength of light is most effective for driving photosynthesis?

The low rate of oxygen production under green light is best explained by the fact that

The white light control produced slightly less oxygen than red light alone. Which explanation best accounts for this observation?

Based on the data, what is the approximate ratio of oxygen production under red light to oxygen production under green light? Round to the nearest whole number.

The oxygen released during photosynthesis comes from the splitting of which molecule?

Which of the following correctly describes where the Krebs cycle (citric acid cycle) takes place?

During cellular respiration, the majority of ATP is produced during which process?

If a poison blocks the electron transport chain, which of the following would be a direct consequence?

A cell is provided with glucose labeled with radioactive carbon (¹⁴C). After complete aerobic respiration, in which molecule(s) would the ¹⁴C label appear?

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

In the absence of oxygen, yeast cells can produce ethanol and CO₂ through fermentation. What is the primary biological purpose of fermentation?

Which of the following best explains why the Calvin cycle is considered light-independent but not light-unrelated?

During the light reactions of photosynthesis, the proton gradient used to drive ATP synthesis is established across which membrane?

Glycolysis breaks down one molecule of glucose into two molecules of

Based on the data, which substance provided the highest rate of cellular respiration?

The control group (water only) still produced 6.1 mL of CO₂. The best explanation for this is that

If the experiment were repeated at 10°C instead of 25°C, how would the CO₂ production most likely change?

The chemiosmotic hypothesis explains ATP synthesis by describing how

In photosynthesis, carbon fixation refers to

The net ATP yield from glycolysis per molecule of glucose is how many ATP?

A total of approximately 30-32 ATP are produced from the complete aerobic oxidation of one molecule of glucose. Approximately what percentage of the ATP is produced by oxidative phosphorylation? Round to the nearest whole number.

Based on the data, the CO₂ production rate increases most dramatically between which two temperatures?

The decrease in CO₂ production at 40°C and 50°C is most likely due to

The CO₂ in this experiment is a product of which metabolic process?

During the light-dependent reactions of photosynthesis, the splitting of water molecules directly contributes

Where in the mitochondria does the electron transport chain (ETC) take place?

If a cell is treated with oligomycin, which inhibits ATP synthase, which of the following would be the immediate effect?

The Calvin cycle uses ATP and NADPH produced during the light reactions to

Which molecule is the final electron acceptor in aerobic cellular respiration?

Cyanide binds to Complex IV of the electron transport chain. A cell exposed to cyanide would

In C₄ plants, carbon fixation occurs in mesophyll cells using PEP carboxylase before the Calvin cycle runs in bundle-sheath cells. This adaptation primarily

During cellular respiration, the most ATP is produced during which stage?

One molecule of glucose yields a net of 2 ATP, 2 NADH, and 2 pyruvate during glycolysis. If 5 glucose molecules undergo glycolysis, how many total NADH molecules are produced? Express as a whole number.

Substrate-level phosphorylation differs from oxidative phosphorylation in that substrate-level phosphorylation

A plant is exposed to light with a wavelength of 550 nm (green light). Compared to red or blue light, the rate of photosynthesis would most likely

A plant is treated with a herbicide that completely blocks photosystem II but does not affect photosystem I. Which of the following is the most direct consequence?

During aerobic cellular respiration of one glucose molecule, which stage produces the greatest number of ATP molecules?