Question 1

Which of the following statements best explains why water is considered a polar molecule?

Accepted Answer

Water molecules have an unequal sharing of electrons between hydrogen and oxygen, resulting in a slight charge difference.

Question 2

A patient is diagnosed with acidosis, meaning their blood pH is below the normal range. Which of the following reactions would help buffer the excess H+ ions and raise the pH toward normal?

Accepted Answer

$$HCO_3^- + H$$^+ \rightarrow H_2CO_3

Question 3

Which of the following best describes the difference between organic and inorganic compounds in the human body?

Accepted Answer

Organic compounds are characterized by covalently bonded carbon atoms, while inorganic compounds usually lack carbon atoms.

Question 4

Which of the following ions is most directly involved in the transmission of nerve impulses and muscle contraction?

Accepted Answer

$$Ca^{2+}$$

Question 5

A molecule of glucose has the formula $$C_6H_{12}O_6$. Which class of organic molecules does glucose belong to, and what is its primary function in the body?

Accepted Answer

It is a carbohydrate; its primary function is to provide energy for cells.

Question 6

Which of the following best describes the structure of a phospholipid found in cell membranes?

Accepted Answer

A phosphate head group (polar), a glycerol backbone, and two fatty acid tails (non-polar).

Question 7

Which of the following reactions represents the neutralization of an acid by a base in the body?

Accepted Answer

OH^- + H^+ \rightarrow H_2O

Question 8

Which of the following statements about ATP is correct?

Accepted Answer

ATP consists of adenosine (ribose and adenine) and three phosphate groups, with energy stored in covalent bonds.

Question 9

Which of the following best describes the relationship between pH and hydrogen ion concentration in the body?

Accepted Answer

As $$[H^+]$$ increases, pH decreases.

Question 10

A patient is found to have a blood pH of 7.0. Which of the following best describes their condition?

Accepted Answer

They are experiencing acidosis.

Question 11

Which of the following is a correct pairing of a nucleic acid base with its complementary base in DNA?

Accepted Answer

Adenine (A) pairs with Thymine (T)

Question 12

Which of the following best explains why lipids are insoluble in water?

Accepted Answer

Lipids are composed of nonpolar molecules that do not interact with water's polar molecules.

Question 13

Which of the following is NOT a function of proteins in the human body?

Accepted Answer

Source of stored energy in adipose tissue

Question 14

Which of the following best describes the process by which NaCl dissolves in water?

Accepted Answer

NaCl dissociates into Na^+ and Cl^- ions due to the polar nature of water.

Question 15

Which of the following is a correct description of a triglyceride?

Accepted Answer

A molecule composed of glycerol and three fatty acids.

Question 16

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

Accepted Answer

Cholesterol is found in cell membranes and is used to synthesize steroids.

Question 17

Which of the following is a correct formula for a monosaccharide?

Accepted Answer

$$(CH_2O)_n$$

Question 18

Which of the following best describes the basic building blocks of proteins?

Accepted Answer

Amino acids

Question 19

Which of the following is a correct description of the structure of DNA?

Accepted Answer

Double-stranded helix with alternating deoxyribose and phosphate forming the uprights, and bases A, T, C, G forming the rungs.

Question 20

Which of the following best describes the process by which ATP provides energy for cellular activities?

Accepted Answer

ATP is hydrolyzed, breaking a high-energy bond to form ADP and inorganic phosphate, releasing energy.

Chemical Level of Organization: Foundations for Anatomy & Physiology

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