Question 1

Which of the following best describes the difference between catabolic and anabolic pathways in metabolism?

Accepted Answer

Catabolic pathways break down complex molecules into simpler ones, releasing energy; anabolic pathways build complex molecules from simpler ones, requiring energy input.

Question 2

A scientist measures the change in free energy ($$\Delta G) $$for a chemical reaction and finds $$\Delta G = -15 kJ/$$mol. Which statement is correct about this reaction?

Accepted Answer

The reaction is exergonic and will proceed spontaneously.

Question 3

Which of the following is an example of negative entropy change ($$\Delta S \u003c 0) in a $$biological system?

Accepted Answer

The folding of a polypeptide chain into a functional protein.

Question 4

Which statement best explains why ATP hydrolysis releases so much energy?

Accepted Answer

The repulsion between negatively charged phosphate groups is relieved when ATP is hydrolyzed.

Question 5

During glycolysis, what are the net products generated from one molecule of glucose?

Accepted Answer

2 pyruvate, 2 ATP, and 2 NADH

Question 6

Which of the following best describes the role of oxygen in aerobic cellular respiration?

Accepted Answer

Oxygen is the final electron acceptor, forming water.

Question 7

A patient’s muscle cells are deprived of oxygen during intense exercise. Which process allows ATP production to continue under these conditions?

Accepted Answer

Lactic acid fermentation

Question 8

Which of the following statements about competitive and non-competitive enzyme inhibitors is correct?

Accepted Answer

Competitive inhibitors bind to the active site, while non-competitive inhibitors bind to a different site on the enzyme.

Question 9

Which of the following best describes the function of ATP synthase in mitochondria?

Accepted Answer

It synthesizes ATP as protons flow down their gradient from the intermembrane space to the matrix.

Question 10

Which of the following is a correct sequence of events in cell signaling?

Accepted Answer

Reception → Transduction → Response

Question 11

Which of the following is an example of endocrine signaling?

Accepted Answer

A hormone released by the pancreas traveling through the bloodstream to affect liver cells.

Question 12

Which enzyme degrades cyclic AMP (cAMP) in a cell signaling pathway?

Accepted Answer

Phosphodiesterase

Question 13

During mitosis, what is the primary function of the mitotic spindle?

Accepted Answer

To separate sister chromatids and move them to opposite poles of the cell

Question 14

Which checkpoint in the cell cycle ensures that all chromosomes are properly attached to the spindle before anaphase begins?

Accepted Answer

M (spindle assembly) checkpoint

Question 15

Which of the following best describes the difference between cytokinesis in plant and animal cells?

Accepted Answer

Animal cells form a cleavage furrow, while plant cells form a cell plate.

Question 16

Which of the following statements about the Calvin cycle is correct?

Accepted Answer

It uses ATP and NADPH to convert CO$$_2$$ into sugars.

Question 17

Which enzyme is responsible for carbon fixation in the Calvin cycle?

Accepted Answer

Rubisco

Question 18

Which of the following best describes the role of kinases and phosphatases in cell signaling?

Accepted Answer

Kinases add phosphate groups to proteins; phosphatases remove phosphate groups.

Question 19

Which of the following is true about the flow of electrons during the light-dependent reactions of photosynthesis?

Accepted Answer

Electrons are transferred from water to NADP$$^+$$, forming NADPH.

Question 20

A cell is observed to have two sets of chromosomes (2n). What term best describes its ploidy?

Accepted Answer

Diploid

Comprehensive Study Notes: Enzymes, Metabolism, Respiration, Photosynthesis, Cell Signaling, and Cell Division

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