Question 1

Which of the following statements best describes the difference between an ionic bond and a covalent bond?

Accepted Answer

Ionic bonds involve the transfer of electrons from one atom to another, resulting in oppositely charged ions that attract each other, while covalent bonds involve the sharing of electrons between atoms.

Question 2

A patient is injected with a radioisotope for a PET scan. Which property of radioisotopes makes them useful for this diagnostic procedure?

Accepted Answer

They emit radiation as they decay, which can be detected and imaged to track metabolic activity.

Question 3

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

Accepted Answer

The oxygen atom in water has a higher electronegativity than the hydrogen atoms, resulting in an unequal sharing of electrons and partial charges.

Question 4

Which of the following equations represents a hydrolysis reaction?

Accepted Answer

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

Question 5

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

Accepted Answer

It is acidic and contains more hydrogen (H+) ions than hydroxide (OH-) ions.

Question 6

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

Accepted Answer

Enzymes lower the activation energy required for biochemical reactions, allowing them to occur more rapidly.

Question 7

Which of the following is a correct statement about the structure of DNA?

Accepted Answer

DNA is a double helix composed of two complementary strands held together by hydrogen bonds between nitrogenous bases.

Question 8

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

Accepted Answer

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

Question 9

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 10

A patient’s blood pH is measured at 7.2. Which physiological state does this represent, and what could be a potential consequence if not corrected?

Accepted Answer

Acidosis; could result in coma if pH drops below 7.

Question 11

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

Accepted Answer

A molecule consists of two or more atoms held together by shared electrons, while a compound is a chemical substance composed of atoms of two or more different elements.

Question 12

Which of the following equations represents a reversible reaction?

Accepted Answer

$$A + B \leftrightarrow AB$$

Question 13

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

Accepted Answer

The sequence of amino acids in a single polypeptide chain.

Question 14

Which of the following is a correct pairing of a nitrogenous base with its nucleic acid?

Accepted Answer

Thymine is found only in DNA.

Question 15

Which of the following best describes the process of phosphorylation?

Accepted Answer

The attachment of a phosphate group to another molecule, often storing or transferring energy.

Question 16

Which of the following best explains why sodium (Na) forms a cation with a +1 charge?

Accepted Answer

Sodium loses one electron, resulting in one more proton than electron.

Question 17

Which of the following is a correct description of a buffer in the human body?

Accepted Answer

A buffer helps to prevent large fluctuations in pH by absorbing or releasing hydrogen ions.

Question 18

Which of the following best describes the difference between saturated and unsaturated fatty acids?

Accepted Answer

Saturated fatty acids have no double bonds and are saturated with hydrogen atoms, while unsaturated fatty acids have one or more double bonds.

Question 19

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

Accepted Answer

Glycogen is a polysaccharide that serves as the main storage form of glucose in muscle and liver cells.

The Chemical Level of Organization: Foundations for Anatomy & Physiology

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