Question 1

Which of the following best describes the difference between mass and weight?

Accepted Answer

Mass is the amount of matter an object contains and is constant, while weight is the force of gravity on that mass and can vary with location.

Question 2

Which of the following statements about isotopes is correct?

Accepted Answer

Isotopes of an element have the same number of protons but different numbers of neutrons.

Question 3

Which of the following best explains why water is an excellent solvent for ionic compounds?

Accepted Answer

Water is a polar molecule, so its partial charges attract and surround ions, separating them from each other.

Question 4

Which of the following is a correct representation of a synthesis (anabolic) reaction?

Accepted Answer

$$A + B \rightarrow AB$$

Question 5

A solution with a pH of 4 has how many times more hydrogen ions ($$[H^+]) $$than a solution with a pH of 7?

Accepted Answer

1000 times more

Question 6

Which of the following best describes the role of enzymes in chemical reactions?

Accepted Answer

Enzymes lower the activation energy required for a reaction, increasing the reaction rate.

Question 7

Which of the following is a property of water that helps maintain body temperature homeostasis?

Accepted Answer

High heat of vaporization

Question 8

Which of the following best describes a buffer in biological systems?

Accepted Answer

A buffer resists changes in pH by accepting or donating hydrogen ions ($$H^+).$$

Question 9

Which of the following statements about covalent bonds is correct?

Accepted Answer

Covalent bonds involve the sharing of electrons between atoms.

Question 10

Which of the following is an example of a decomposition (catabolic) reaction in the human body?

Accepted Answer

Glycogen breaking down into glucose molecules

Question 11

Which of the following best explains why saturated fats are solid at room temperature while unsaturated fats are liquid?

Accepted Answer

Saturated fats have straight chains that pack closely together, while unsaturated fats have kinks due to double bonds, preventing tight packing.

Question 12

Which of the following is a correct description of the primary structure of a protein?

Accepted Answer

The sequence of amino acids in a polypeptide chain.

Question 13

Which of the following best describes the difference between a solution, a colloid, and a suspension?

Accepted Answer

Solutions have tiny particles that do not settle or scatter light, colloids have larger particles that scatter light but do not settle, and suspensions have large particles that settle out.

Question 14

Which of the following is true regarding the structure of DNA?

Accepted Answer

DNA is a double-stranded helix with complementary base pairing between adenine and thymine, and cytosine and guanine.

Question 15

Which of the following best explains why enzymes are highly specific for their substrates?

Accepted Answer

Enzymes have active sites with unique shapes that only fit specific substrate molecules.

Question 16

Which of the following is a correct representation of the hydrolysis of ATP?

Accepted Answer

$$\mathrm{ATP} + \mathrm{H}_2\mathrm{O} ightarrow \mathrm{ADP} + \mathrm{P}_i + 	ext{energy}$$

Question 17

Which of the following best describes the amphipathic nature of phospholipids?

Accepted Answer

Phospholipids have both a polar (hydrophilic) head and nonpolar (hydrophobic) tails.

Question 18

Which of the following is a correct example of an exchange reaction?

Accepted Answer

$$\mathrm{AB} + \mathrm{CD} \rightarrow \mathrm{AD} + \mathrm{CB}$$

Question 19

Which of the following best explains why carbon is so versatile in forming organic molecules?

Accepted Answer

Carbon can form up to four covalent bonds with other atoms, allowing for a variety of structures.

Chemistry Comes Alive: Essential Concepts for Anatomy & Physiology

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