Question 1

Which of the following best describes the role of enzymes in biological systems?

Accepted Answer

Enzymes lower the activation energy, thereby speeding up chemical reactions.

Question 2

A scientist is studying the effect of temperature on enzyme activity. She observes that at very high temperatures, the enzyme loses its function. What is the most likely explanation for this observation?

Accepted Answer

The enzyme denatures, losing its three-dimensional structure necessary for activity.

Question 3

Which equation correctly represents the process of photosynthesis?

Accepted Answer

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

Question 4

Which of the following is a major difference between prokaryotic and eukaryotic cells?

Accepted Answer

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

Question 5

A patient is diagnosed with sickle cell anemia, a genetic disorder caused by a mutation in the hemoglobin gene. Which type of mutation is most likely responsible for this disease?

Accepted Answer

A point mutation resulting in a single amino acid substitution.

Question 6

Which of the following best explains why ATP is considered the 'energy currency' of the cell?

Accepted Answer

ATP stores energy in its phosphate bonds, which can be released to power cellular processes.

Question 7

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

Accepted Answer

Oxygen ($$O_2)$$

Question 8

Which of the following statements about diffusion is correct?

Accepted Answer

Diffusion is the passive movement of molecules from high to low concentration.

Question 9

A cell placed in a hypertonic solution will:

Accepted Answer

Lose water and shrink.

Question 10

Which process is responsible for the synthesis of RNA from a DNA template?

Accepted Answer

Transcription

Question 11

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

Accepted Answer

Mitochondria generate ATP through cellular respiration.

Question 12

Which of the following is a product of glycolysis?

Accepted Answer

Pyruvate

Question 13

Which of the following best describes the structure of a phospholipid bilayer in cell membranes?

Accepted Answer

Hydrophilic heads face outward, hydrophobic tails face inward.

Question 14

Which equation represents the net reaction for aerobic cellular respiration?

Accepted Answer

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

Question 15

A researcher uses Polymerase Chain Reaction (PCR) to amplify a segment of DNA. Which enzyme is essential for this process?

Accepted Answer

DNA polymerase

Question 16

Which of the following is true about Mendel's first law of inheritance (Law of Segregation)?

Accepted Answer

Alleles for a trait separate during gamete formation.

Question 17

Which organelle is responsible for protein synthesis in eukaryotic cells?

Accepted Answer

Ribosome

Question 18

A cell is observed to have a large central vacuole, a cell wall, and chloroplasts. What type of cell is this most likely to be?

Accepted Answer

Plant cell

Question 19

Which of the following best describes the process of natural selection?

Accepted Answer

Individuals with traits best suited to their environment are more likely to survive and reproduce.

Question 20

Which of the following statements about viruses is correct?

Accepted Answer

Viruses are intracellular parasites that hijack cellular machinery for replication.

General Biology I: Core Concepts and Study Guide

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