$$CO_2 + H_2O$$ + \text{energy (light)} \rightarrow \text{glucose} + $$O_2$$

Question 1

Which of the following best describes the role of ATP in cellular metabolism?

Accepted Answer

ATP is the 'energy currency' of the cell, directly fueling cellular work such as mechanical, transport, and chemical processes.

Question 2

During aerobic cellular respiration, which molecule is the final electron acceptor in the electron transport chain?

Accepted Answer

Oxygen ($$O_2)$$

Question 3

Which process occurs in the cytoplasm of eukaryotic cells and results in the production of pyruvate?

Accepted Answer

Glycolysis

Question 4

A patient with a high fever (above 104°F) is at risk for which cellular process disruption?

Accepted Answer

Protein denaturation, leading to loss of enzyme function

Question 5

Which of the following statements about enzyme action is correct?

Accepted Answer

Enzymes bring reactant molecules together and lower the activation energy required for reactions.

Question 6

What is the net yield of glycolysis from one molecule of glucose?

Accepted Answer

$$2$$ NADH, $$2$$ ATP, and $$2$$ pyruvic acids

Question 7

Which regulatory mechanism involves a molecule binding to an enzyme at a site other than the active site, causing a change in enzyme shape?

Accepted Answer

Allosteric regulation

Question 8

In the citric acid cycle, what happens to acetyl CoA?

Accepted Answer

It is oxidized to produce $$CO_2$$, NADH, FADH$$_2$$, and ATP.

Question 9

Which of the following best explains why most biological chemical reactions require enzymes?

Accepted Answer

Enzymes bring reactants together in precise orientations and lower the energy needed for reactions.

Question 10

Which of the following is an example of feedback inhibition in a metabolic pathway?

Accepted Answer

The final product of a pathway inhibits an enzyme earlier in the pathway.

Question 11

Which of the following equations correctly represents the overall process of photosynthesis?

Accepted Answer

$$CO_2 + H_2O$$ + 	ext{energy (light)} ightarrow 	ext{glucose} + $$O_2$$

Question 12

Which statement best describes the difference between aerobic and anaerobic respiration?

Accepted Answer

Aerobic respiration uses $$O_2 as $$the final electron acceptor, while anaerobic uses other molecules.

Question 13

What is the primary function of the electron transport chain in cellular respiration?

Accepted Answer

To transfer electrons and create a proton gradient used to synthesize ATP.

Question 14

Which molecule acts as an electron shuttle during cellular respiration?

Accepted Answer

NAD$$^+$$

Question 15

A mutation causes an enzyme to lose its ability to undergo conformational change. What is the most likely effect?

Accepted Answer

The enzyme will be unable to facilitate the reaction, reducing its catalytic activity.

Question 16

Which of the following best describes substrate-level phosphorylation?

Accepted Answer

ATP is produced directly by transferring a phosphate group from a substrate to ADP.

Question 17

Which cellular structure is the site of pyruvate processing in eukaryotes?

Accepted Answer

Mitochondrial matrix

Question 18

Which of the following is NOT a function of enzymes in biological reactions?

Accepted Answer

Enzymes are used up and cannot be reused.

Question 19

Which of the following would most likely inhibit phosphofructokinase during glycolysis?

Accepted Answer

High levels of ATP

Energy Transformations, Enzyme Function, and Cellular Respiration in General Biology

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