Question 1

Which of the following best describes the difference between a scientific theory and a scientific hypothesis?

Accepted Answer

A hypothesis is a prediction about a single experiment, while a theory is a broad explanation supported by extensive evidence.

Question 2

Which of the following is an example of a dehydration reaction in biological systems?

Accepted Answer

Linking two monosaccharides to form a disaccharide, releasing $H_2O$.

Question 3

A patient is given an intravenous solution that is hypertonic relative to their red blood cells. What is the most likely outcome for the red blood cells?

Accepted Answer

They will shrink as water leaves the cells by osmosis.

Question 4

Which of the following best explains why enzymes are highly specific for their substrates?

Accepted Answer

The active site of an enzyme has a unique three-dimensional shape that fits only specific substrates.

Question 5

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

Accepted Answer

Both phospholipids and proteins can move laterally within the layer, giving the membrane flexibility.

Question 6

A scientist wants to test the effect of a new fertilizer on plant growth. Which of the following is the best example of a controlled variable in this experiment?

Accepted Answer

The type of plant used in all experimental groups.

Question 7

Which of the following best describes the process of active transport across a cell membrane?

Accepted Answer

Movement of molecules from low to high concentration using energy from ATP.

Question 8

Which of the following is a correct statement about the citric acid cycle (Krebs cycle)?

Accepted Answer

It produces $CO_2$, ATP, NADH, and FADH_2$ as products.

Question 9

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

Accepted Answer

Water is polar and can form hydrogen bonds with charged and polar molecules.

Question 10

A mutation causes a change in the primary structure of a protein. Which of the following is the most likely consequence?

Accepted Answer

The protein may fold incorrectly, affecting its secondary, tertiary, and quaternary structures.

Question 11

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

Accepted Answer

ATP stores and transfers energy for cellular processes.

Question 12

Which of the following is a correct comparison between prokaryotic and eukaryotic cells?

Accepted Answer

Eukaryotic cells have a nucleus, while prokaryotic cells lack a nucleus.

Question 13

Which of the following best describes the function of the rough endoplasmic reticulum (RER)?

Accepted Answer

Synthesis and modification of proteins destined for secretion or membranes.

Question 14

Which of the following scenarios best illustrates the concept of natural selection?

Accepted Answer

A population of bacteria exposed to antibiotics develops resistance over several generations.

Question 15

Which of the following equations correctly represents the process of aerobic cellular respiration?

Accepted Answer

$C_6H_{12}O_6 + 6O_2 ightarrow 6CO_2 + 6H_2O + 	ext{energy (ATP)}$

Question 16

Which of the following best explains why maintaining pH homeostasis is important for living organisms?

Accepted Answer

Enzyme activity and protein structure are sensitive to changes in pH.

Question 17

Which of the following is a correct statement about facilitated diffusion?

Accepted Answer

It uses membrane proteins to move molecules down their concentration gradient without energy input.

Question 18

Which of the following best describes the relationship between dehydration synthesis and hydrolysis?

Accepted Answer

Dehydration synthesis builds polymers by removing water, while hydrolysis breaks polymers by adding water.

Question 19

A cell is placed in a solution and swells until it bursts. Which of the following best describes the solution relative to the cell?

Accepted Answer

The solution is hypotonic to the cell.

Question 20

Which of the following best describes the function of mitochondria in eukaryotic cells?

Accepted Answer

They are the site of aerobic respiration and ATP production.

General Biology: Core Concepts and Learning Objectives

Study Guide - Practice Questions

Study Guide - Flashcards