Question 1

Which of the following best describes the function of the mitochondrion in a human cell?

Accepted Answer

It produces ATP through cellular respiration.

Question 2

A cell is observed under a microscope and appears to have a large central vacuole, chloroplasts, and a cell wall. Which domain of life does this cell most likely belong to?

Accepted Answer

Eukarya

Question 3

Which of the following best explains why cells are generally small in size?

Accepted Answer

Smaller cells have a higher surface area-to-volume ratio, allowing efficient exchange of materials.

Question 4

Which type of microscopy would be most appropriate for observing the internal structure of mitochondria?

Accepted Answer

Transmission electron microscopy

Question 5

Which element is most abundant in the human body by mass?

Accepted Answer

Oxygen

Question 6

Which of the following best illustrates the concept of reductionism in biology?

Accepted Answer

Analyzing the function of a single enzyme to understand a metabolic pathway.

Question 7

Why is DNA considered essential for life?

Accepted Answer

It encodes the instructions for building proteins.

Question 8

Which of the following bonds is responsible for holding together the two strands of DNA?

Accepted Answer

Hydrogen bonds

Question 9

A molecule has a partial positive charge on one end and a partial negative charge on the other. Which term best describes this molecule?

Accepted Answer

Polar

Question 10

What happens when a negatively charged ion encounters a positively charged ion?

Accepted Answer

They attract and may form an ionic bond.

Question 11

A solution has a pH of 3. Which statement is correct?

Accepted Answer

The solution is acidic.

Question 12

Which is the correct order of steps in the scientific method?

Accepted Answer

Observation, Hypothesis, Experiment, Analysis, Conclusion

Question 13

Which of the following best defines homeostasis?

Accepted Answer

The maintenance of a stable internal environment.

Question 14

Which of the following is a molecule but not an element?

Accepted Answer

O$$_2$$

Question 15

Which characteristic is shared by both living and nonliving things?

Accepted Answer

Presence of atoms and molecules

Question 16

Why is radioisotope technology important in medical diagnostics?

Accepted Answer

It allows visualization of internal structures by tracking radioactive tracers.

Question 17

How can an atom change its charge?

Accepted Answer

By gaining or losing electrons.

Question 18

Which of the following best describes diffusion?

Accepted Answer

Movement of molecules from an area of high concentration to low concentration.

Question 19

During the electron transport chain, most ATP is produced by which protein complex?

Accepted Answer

ATP synthase

Question 20

Which of the following molecules can freely pass through the plasma membrane without assistance?

Accepted Answer

O$$_2$$

Human Biology Exam 1 Study Guide: Chapters 1-4 (Cells, Chemistry, Tissues, and Organ Systems)

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