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 molecule of water ($$\mathrm{H_2O}) is $$considered polar because:

Accepted Answer

The oxygen atom attracts electrons more strongly than the hydrogen atoms.

Question 3

Which of the following is NOT a characteristic shared by living and nonliving things?

Accepted Answer

Ability to maintain homeostasis

Question 4

A cell placed in an isotonic solution will:

Accepted Answer

Maintain its shape and size

Question 5

Which protein complex is responsible for most ATP production during the electron transport chain?

Accepted Answer

ATP synthase

Question 6

Which of the following elements is most abundant in the human body?

Accepted Answer

Oxygen ($$\mathrm{O})$$

Question 7

Which type of bond involves the sharing of electrons between atoms?

Accepted Answer

Covalent bond

Question 8

Which of the following best describes the process of diffusion?

Accepted Answer

Passive movement of molecules from high concentration to low concentration

Question 9

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

Accepted Answer

Small nonpolar molecules

Question 10

Which type of microscopy would be most appropriate for viewing the internal structure of a mitochondrion?

Accepted Answer

Transmission electron microscopy

Question 11

Which tissue type is primarily found lining the stomach and is responsible for contraction during digestion?

Accepted Answer

Smooth muscle

Question 12

Which of the following best explains why radioisotope technology is important in biology?

Accepted Answer

It enables tracking of molecules in metabolic pathways.

Question 13

Which of the following is the correct order of the scientific method?

Accepted Answer

Observation, hypothesis, experiment, analysis, conclusion

Question 14

Which of the following best describes homeostasis?

Accepted Answer

The maintenance of a stable internal environment

Question 15

Which of the following is a function of the Golgi apparatus?

Accepted Answer

Packaging and modifying proteins for export

Question 16

Which of the following statements about the relationship between cell size and surface area is correct?

Accepted Answer

As cell size increases, the surface area-to-volume ratio decreases.

Question 17

Which of the following is true about active transport across the plasma membrane?

Accepted Answer

It requires energy in the form of ATP.

Question 18

During glycolysis, what is the primary purpose of the pathway?

Accepted Answer

To break down glucose into pyruvate and generate ATP

Question 19

Which electron carriers are involved in the citric acid cycle, and from where do they obtain electrons?

Accepted Answer

NADH and FADH$$_2$$; electrons are obtained from the oxidation of acetyl-CoA

Question 20

Which of the following best describes the difference between an element and a molecule?

Accepted Answer

An element is a pure substance consisting of one type of atom; a molecule is a combination of two or more atoms bonded together.

Human Biology Study Guide: Introduction, Chemistry of Life, Cells, and Tissues

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