Q: Which of the following is a correct example of an ionic bond?

The attraction between Na\textsuperscript{+} and Cl\textsuperscript{–} in NaCl

Q: A solution has a pH of 4. Which of the following statements is true?

The solution is acidic and has a higher concentration of H\textsuperscript{+} ions than a solution with pH 7.

Q: Which of the following best describes the role of buffers in the human body?

Buffers help maintain pH by minimizing changes in H\textsuperscript{+} concentration.

Question 1

Which of the following best describes the difference between anatomy and physiology?

Accepted Answer

Anatomy studies the structure of body parts, while physiology studies their function.

Question 2

A scientist observes that a new drug lowers blood pressure in rats. She forms a hypothesis, tests it with experiments, analyzes the data, and publishes her results. Which step of the scientific method is she performing when she forms a hypothesis?

Accepted Answer

Developing a testable explanation based on observations.

Question 3

Which of the following is NOT a characteristic common to all living things?

Accepted Answer

Inability to respond to stimuli

Question 4

Which of the following best explains why the anatomic position is important in anatomy?

Accepted Answer

It provides a standardized reference for describing body parts and directions.

Question 5

A patient is experiencing a decrease in blood glucose. The pancreas releases glucagon, which causes the liver to release glucose into the blood, restoring normal levels. This is an example of:

Accepted Answer

Negative feedback

Question 6

Which of the following best describes the octet rule?

Accepted Answer

Atoms tend to gain, lose, or share electrons to have eight electrons in their valence shell.

Question 7

Which of the following is a correct example of an ionic bond?

Accepted Answer

The attraction between Na	extsuperscript{+} and Cl	extsuperscript{–} in NaCl

Question 8

Which property of water allows it to moderate temperature changes in the human body?

Accepted Answer

High specific heat

Question 9

A solution has a pH of 4. Which of the following statements is true?

Accepted Answer

The solution is acidic and has a higher concentration of H	extsuperscript{+} ions than a solution with pH 7.

Question 10

Which of the following best describes the role of buffers in the human body?

Accepted Answer

Buffers help maintain pH by minimizing changes in H	extsuperscript{+} concentration.

Question 11

Which of the following is a distinguishing characteristic of carbohydrates?

Accepted Answer

They are composed of carbon, hydrogen, and oxygen in a 1:2:1 ratio.

Question 12

Which of the following best describes the difference between DNA and RNA?

Accepted Answer

DNA contains deoxyribose and is double-stranded; RNA contains ribose and is single-stranded.

Question 13

Which of the following best describes the primary structure of a protein?

Accepted Answer

The sequence of amino acids joined by peptide bonds

Question 14

Which of the following is an example of denaturation?

Accepted Answer

A protein loses its three-dimensional structure when exposed to high heat.

Question 15

Which of the following equations correctly represents the overall chemical reaction for glucose oxidation in cellular respiration?

Accepted Answer

$$\mathrm{C_6H_{12}O_6$} + 6\,\mathrm{O_2$} ightarrow 6\,\mathrm{CO_2$} + 6\,\mathrm{H_2O} + 30	ext{--}32\,\mathrm{ATP}$$

Question 16

Which of the following best explains why energy conversion in the body is always less than 100% efficient?

Accepted Answer

Some energy is always lost as heat, according to the second law of thermodynamics.

Question 17

Which of the following best describes the effect of a noncompetitive inhibitor on an enzyme?

Accepted Answer

It binds to an allosteric site, changing the enzyme's shape and reducing its activity.

Question 18

If oxygen is not available during cellular respiration, what is the fate of pyruvate?

Accepted Answer

It is converted to lactate (lactic acid) in the cytosol.

Question 19

Which of the following best describes the role of NADH and FADH$$_2 in $$cellular respiration?

Accepted Answer

They carry high-energy electrons to the electron transport chain for ATP production.

Question 20

Which of the following best describes the entry point for fatty acids in cellular respiration?

Accepted Answer

Fatty acids are converted to acetyl-CoA, which enters the citric acid cycle.

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