$$[H^+] = 1 \times 10$$^{-4}$$ M

Question 1

Which of the following best explains why water is considered the 'universal solvent' in biological systems?

Accepted Answer

Water is a polar molecule, allowing it to form hydration spheres around ions and polar molecules.

Question 2

A patient is experiencing muscle cramps due to an electrolyte imbalance. Which of the following ions is most likely involved in this scenario?

Accepted Answer

K+ (potassium)

Question 3

Which of the following chemical equations represents a balanced synthesis reaction for the formation of water?

Accepted Answer

$$2H_2 + O_2$ \rightarrow 2H_2O$$

Question 4

Which property of water is most responsible for the ability of sweat to cool the body?

Accepted Answer

Water's high heat of vaporization

Question 5

A solution has a pH of 4. What is the hydrogen ion concentration ($$[H^+]) in $$moles per liter?

Accepted Answer

$$[H^+] = 1 	imes 10$$^{-4}$$ M

Question 6

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

Accepted Answer

Saturated fatty acids contain only single bonds between carbon atoms, while unsaturated fatty acids contain one or more double bonds.

Question 7

Which of the following statements about enzymes is correct?

Accepted Answer

Enzymes lower the activation energy and are not changed or consumed in the reaction.

Question 8

A peptide bond is formed between which two functional groups of adjacent amino acids?

Accepted Answer

Amino group and carboxyl group

Question 9

Which of the following best explains why DNA is more stable than RNA in the cell?

Accepted Answer

DNA is double-stranded and contains deoxyribose, making it less reactive than the ribose in RNA.

Question 10

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

Accepted Answer

$$AB + CD \rightarrow AD + CB$$

Question 11

A buffer system in the blood helps maintain pH homeostasis. Which of the following best describes how a buffer works?

Accepted Answer

A buffer system neutralizes acids or bases to prevent large changes in pH.

Question 12

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

Accepted Answer

The sequence of amino acids in a polypeptide chain

Question 13

Which of the following molecules is classified as a disaccharide?

Accepted Answer

Sucrose

Question 14

Which of the following is a physiological role of cholesterol in the human body?

Accepted Answer

It is a component of plasma membranes and a precursor for steroid hormones.

Question 15

Which of the following best describes the process of hydrolysis?

Accepted Answer

The breakdown of a molecule by the addition of a water molecule

Question 16

Which of the following statements about ATP is correct?

Accepted Answer

ATP stores energy in the bonds between its phosphate groups.

Question 17

Which of the following best describes a hydrogen bond?

Accepted Answer

A weak attraction between a hydrogen atom in a polar covalent bond and a partially negative atom in another molecule

Question 18

Which of the following is an example of an organic compound?

Accepted Answer

C6H12O6 (glucose)

Question 19

Which of the following functional groups acts as a base and is found in amino acids?

Accepted Answer

Amino group ($$-NH_2$)

The Chemical Level of Organization: Foundations for Anatomy & Physiology

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