Question 1

Which of the following best explains why water is an excellent solvent for many biological molecules?

Accepted Answer

Water molecules form hydrogen bonds with polar molecules, allowing them to dissolve easily.

Question 2

Which equation correctly represents the process of cellular respiration?

Accepted Answer

$$C_6H_{12}O_6$ + 6O_2 \rightarrow 6CO_2 + 6H_2O + ATP$$

Question 3

A scientist is studying a cell that lacks a nucleus and membrane-bound organelles. Which type of cell is she most likely observing?

Accepted Answer

Prokaryotic cell

Question 4

Which of the following best describes the function of ribosomes in a cell?

Accepted Answer

They assemble amino acids into proteins.

Question 5

Which of the following statements about the fluid mosaic model of the plasma membrane is correct?

Accepted Answer

The membrane is composed of a phospholipid bilayer with embedded proteins that can move laterally.

Question 6

During which phase of the cell cycle does DNA replication occur?

Accepted Answer

S phase

Question 7

Which of the following best explains why genetic variation is important in sexual reproduction?

Accepted Answer

It increases the likelihood that some individuals will survive environmental changes.

Question 8

Which of the following is a correct statement about the structure of DNA?

Accepted Answer

DNA is a double helix with complementary base pairing between adenine and thymine, and cytosine and guanine.

Question 9

Which of the following best describes the process of osmosis?

Accepted Answer

The movement of water molecules from low to high solute concentration across a selectively permeable membrane.

Question 10

Which of the following equations represents the law of segregation as described by Mendel?

Accepted Answer

$$Aa \rightarrow A + a$$

Question 11

Which of the following best explains the role of mitochondria in eukaryotic cells?

Accepted Answer

They generate ATP through oxidative phosphorylation.

Question 12

Which of the following is a function of the smooth endoplasmic reticulum?

Accepted Answer

Lipid synthesis and detoxification of harmful substances

Question 13

Which of the following best describes the difference between prokaryotic and eukaryotic cells?

Accepted Answer

Eukaryotic cells have membrane-bound organelles, while prokaryotic cells do not.

Question 14

Which of the following best explains the importance of the citric acid cycle in cellular respiration?

Accepted Answer

It generates high-energy electron carriers for the electron transport chain.

Question 15

Which of the following is a correct description of active transport?

Accepted Answer

Movement of molecules against their concentration gradient using energy from ATP.

Question 16

Which of the following best describes the process of glycolysis?

Accepted Answer

The breakdown of glucose into two molecules of pyruvate, producing ATP and NADH.

Question 17

Which of the following best explains the function of enzymes in biological systems?

Accepted Answer

They act as catalysts to speed up chemical reactions by lowering the activation energy.

Question 18

Which of the following best describes the structure of a phospholipid?

Accepted Answer

A molecule with a hydrophilic head and two hydrophobic tails.

Question 19

Which of the following best explains the significance of crossing over during meiosis?

Accepted Answer

It increases genetic variation by exchanging genetic material between homologous chromosomes.

Question 20

Which of the following best describes the function of the Golgi apparatus?

Accepted Answer

It modifies, sorts, and packages proteins for secretion or delivery to other organelles.

General Biology: Core Concepts and Study Guide (Chapters 1–14)

Study Guide - Practice Questions