Question 1

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

Accepted Answer

An element is a pure substance composed of atoms with the same number of protons, while a compound is a chemical substance composed of atoms of two or more different elements.

Question 2

A patient receives a PET scan using a radioisotope. Which property of the radioisotope is most critical for its use in this diagnostic procedure?

Accepted Answer

It emits radiation that can be detected by imaging equipment as it decays.

Question 3

Which of the following best explains why oxygen is more electronegative than hydrogen in a water molecule?

Accepted Answer

Oxygen has more protons in its nucleus, resulting in a stronger attraction for electrons.

Question 4

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

Accepted Answer

$$AB + H_2O \rightarrow AH + BOH$$

Question 5

A sodium atom loses one electron to a chlorine atom. What type of bond is formed between the resulting ions?

Accepted Answer

Ionic bond

Question 6

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

Accepted Answer

They lower the activation energy required for reactions to occur.

Question 7

A solution has a pH of 5. Which of the following statements is true about this solution?

Accepted Answer

It contains more hydrogen ions ($$H^+) $$than hydroxide ions ($$OH^-).$$

Question 8

Which of the following is a function of triglycerides in the human body?

Accepted Answer

They provide insulation, energy storage, and protection for organs.

Question 9

Which of the following best describes the difference between a saturated and an unsaturated fatty acid?

Accepted Answer

Saturated fatty acids have no double bonds in their hydrocarbon tails, while unsaturated fatty acids have one or more double bonds.

Question 10

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

Accepted Answer

It consists of two complementary strands held together by hydrogen bonds between nitrogenous bases.

Question 11

A protein is exposed to a high fever, causing it to lose its three-dimensional shape. What is this process called, and what is the likely consequence?

Accepted Answer

Denaturation; the protein becomes nonfunctional.

Question 12

Which of the following best explains why humans cannot digest cellulose but can digest starch?

Accepted Answer

The bonds between glucose molecules in cellulose are different from those in starch, and humans lack the enzymes to break cellulose bonds.

Question 13

Which of the following is a correct example of a dehydration synthesis reaction?

Accepted Answer

$$AH + BOH \rightarrow AB + H_2O$$

Question 14

Which of the following statements about ATP is correct?

Accepted Answer

ATP contains two high-energy bonds between its three phosphate groups.

Question 15

A patient’s blood pH is measured at 7.2. Which of the following best describes this condition?

Accepted Answer

Acidosis, which can damage cells and tissues if not corrected.

Question 16

Which of the following best describes the relationship between monomers and polymers in macromolecules?

Accepted Answer

Monomers are joined by dehydration synthesis to form polymers, and polymers are broken down into monomers by hydrolysis.

Question 17

Which of the following is a trace element in the human body and is essential for oxygen transport?

Accepted Answer

Iron (Fe)

Question 18

Which of the following best describes a polar covalent bond?

Accepted Answer

A bond in which electrons are shared unequally, resulting in partial charges on the atoms.

Question 19

Which of the following is a function of phospholipids in the human body?

Accepted Answer

They are the primary component of plasma membranes.

Question 20

Which of the following best describes the structure of an amino acid?

Accepted Answer

A central carbon atom bonded to a hydrogen atom, an amino group, a carboxyl group, and an R group.

Chapter 2: The Chemical Level of Organization – Study Notes for Anatomy & Physiology

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