Question 1

During which specific phase of the cell cycle does DNA replication occur, and what is the main outcome of this process?

Accepted Answer

DNA replication occurs during the S phase, resulting in duplicated chromosomes composed of sister chromatids.

Question 2

Which of the following best describes the difference between haploid and diploid cells?

Accepted Answer

Haploid cells contain one set of chromosomes, while diploid cells contain two sets.

Question 3

During which stage of mitosis do sister chromatids separate and move toward opposite poles of the cell?

Accepted Answer

Anaphase

Question 4

Which of the following statements about cytokinesis is correct?

Accepted Answer

In animal cells, cytokinesis occurs by the formation of a cleavage furrow, while in plant cells, a cell plate forms.

Question 5

What is the main difference between asexual and sexual reproduction in terms of genetic transfer to offspring?

Accepted Answer

Asexual reproduction results in offspring with genetic material identical to the parent, while sexual reproduction results in genetically diverse offspring.

Question 6

During meiosis, at what specific stage do cells become haploid?

Accepted Answer

After telophase I

Question 7

Crossing-over is a critical event in meiosis. When does it occur, and what is its main result?

Accepted Answer

It occurs during prophase I and results in genetic recombination between homologous chromosomes.

Question 8

How many functional ovum (egg) cells and sperm cells are produced from one original cell during meiosis in humans?

Accepted Answer

One ovum and four sperm cells

Question 9

Which of the following best describes the composition of chromatin?

Accepted Answer

Chromatin is composed of DNA and proteins called histones.

Question 10

Which of the following equations correctly represents the overall chemical reaction for cellular respiration?

Accepted Answer

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

Question 11

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

Accepted Answer

2 ATP, 2 NADH, and 2 pyruvate

Question 12

Which of the following statements about NAD+ and NADH is correct?

Accepted Answer

NAD+ is the oxidized form, and NADH is the reduced form.

Question 13

Which stage of aerobic respiration produces the most ATP, and through which process is this ATP generated?

Accepted Answer

Electron transport chain; oxidative phosphorylation

Question 14

During chemiosmosis in mitochondria, in which direction do protons (H+) flow to drive ATP synthesis?

Accepted Answer

From the intermembrane space into the mitochondrial matrix

Question 15

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 16

In the light reactions of photosynthesis, what is the main electron donor, and what is the final electron acceptor?

Accepted Answer

Water is the electron donor, and NADP+ is the final electron acceptor.

Question 17

Which of the following best describes the structure and function of the thylakoid membrane in chloroplasts?

Accepted Answer

It is the site of the light reactions and contains chlorophyll and electron transport chains.

Question 18

During the Calvin cycle (dark reactions) of photosynthesis, what are the main reactants and products?

Accepted Answer

Reactants: CO2, ATP, NADPH; Products: glucose, ADP, NADP+

Question 19

Which of the following statements about redox reactions in photosynthesis is correct?

Accepted Answer

CO2 is reduced to form glucose, and water is oxidized to form O2.

Cell Cycle, Cell Division, Cellular Respiration, and Photosynthesis Study Guide

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