Question 1

Which of the following best defines evolution in the context of biology?

Accepted Answer

A change in the genetic composition of a population over successive generations.

Question 2

Which of the following is NOT considered one of the unifying themes of biology?

Accepted Answer

All living things are composed of multiple cells.

Question 3

A scientist observes that plants in a shaded area grow taller than those in direct sunlight. She hypothesizes that light intensity affects plant height. Which of the following is the dependent variable in her experiment?

Accepted Answer

The height of the plants.

Question 4

Which of the following best describes a hypothesis?

Accepted Answer

A tentative explanation that can be tested by experiments or observations.

Question 5

Which of the following is an example of negative feedback regulation in biological systems?

Accepted Answer

The release of insulin to lower blood glucose levels after a meal.

Question 6

Which of the following statements about prokaryotic and eukaryotic cells is correct?

Accepted Answer

Prokaryotic cells do not have a nucleus, while eukaryotic cells do.

Question 7

Which of the following best describes the relationship between structure and function in biology?

Accepted Answer

The structure of a biological component determines its function.

Question 8

Which of the following is the correct order of the hierarchy of biological organization from smallest to largest?

Accepted Answer

Molecule, cell, tissue, organ, organism

Question 9

Which of the following is a base pair found in DNA?

Accepted Answer

Cytosine–Guanine

Question 10

A researcher is studying the effect of temperature on enzyme activity. She keeps all variables constant except for temperature. What is the control group in this experiment?

Accepted Answer

The group maintained at the standard or optimal temperature for enzyme activity.

Question 11

Which of the following best describes chemical cycling in an ecosystem?

Accepted Answer

Energy flows through an ecosystem and is lost as heat, while chemicals are recycled.

Question 12

Which of the following is a characteristic unique to archaea compared to bacteria?

Accepted Answer

Ability to survive in extreme environments.

Question 13

Which of the following is an example of a quantitative observation?

Accepted Answer

The plant grew 5 cm in one week.

Question 14

Which of the following best describes the scientific method?

Accepted Answer

A cyclical process involving observation, hypothesis formation, experimentation, and analysis.

Question 15

Which of the following is a correct statement about experimental and control groups?

Accepted Answer

The control group is identical to the experimental group except for the variable being tested.

Question 16

Which of the following best explains Darwin's theory of natural selection?

Accepted Answer

Individuals with advantageous traits are more likely to survive and reproduce, passing those traits to offspring.

Question 17

Which of the following is an example of an independent variable in a scientific experiment?

Accepted Answer

The amount of fertilizer applied to plants.

Question 18

Which of the following best describes the difference between qualitative and quantitative data?

Accepted Answer

Quantitative data is numerical, while qualitative data is descriptive.

Question 19

Which of the following is a correct base pairing in DNA, and what type of bond holds the bases together?

Accepted Answer

Cytosine–Guanine, held together by hydrogen bonds.

Question 20

Which of the following best describes the role of feedback mechanisms in homeostasis?

Accepted Answer

Negative feedback mechanisms counteract changes to maintain stability.

General Biology: Chapter 1 Study Guide – Key Concepts and Themes

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