Question 1

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

Accepted Answer

A molecule is a combination of two or more atoms, which may be the same or different elements, while a compound is a molecule composed of two or more different elements.

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

A solution is made by dissolving 10 grams of glucose in 100 mL of water. In this solution, which is the solvent and which is the solute?

Accepted Answer

Water is the solvent, glucose is the solute.

Question 4

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

Accepted Answer

Water is a polar molecule, allowing it to dissolve many ionic and polar substances.

Question 5

Which of the following chemical equations correctly represents a decomposition reaction?

Accepted Answer

$$AB \rightarrow A + B$$

Question 6

A patient is experiencing acidosis. Which of the following pH values would most likely be found in their blood?

Accepted Answer

$$pH = 6.8$$

Question 7

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

Accepted Answer

Enzymes lower the activation energy required for a reaction to proceed.

Question 8

Which of the following is a correct description of a phospholipid's structure and its importance in cell membranes?

Accepted Answer

Phospholipids have a polar, hydrophilic head and two nonpolar, hydrophobic tails, allowing them to form bilayers in cell membranes.

Question 9

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

Question 10

Which of the following is a function of ATP in the cell?

Accepted Answer

ATP provides energy for cellular work by transferring a phosphate group to other molecules.

Question 11

A protein loses its three-dimensional structure due to high fever. What is this process called, and what is a likely consequence?

Accepted Answer

Denaturation; the protein may lose its function.

Question 12

Which of the following best describes the difference between DNA and RNA?

Accepted Answer

DNA contains deoxyribose and thymine, while RNA contains ribose and uracil.

Question 13

Which of the following is an example of an oxidation-reduction reaction in the human body?

Accepted Answer

The breakdown of glucose to produce ATP, where electrons are transferred from glucose to oxygen.

Question 14

Which of the following statements about buffers is correct?

Accepted Answer

Buffers resist changes in pH by releasing or binding hydrogen ions.

Question 15

Which of the following best describes the octet rule and its significance in chemical bonding?

Accepted Answer

Atoms are most stable when they have eight electrons in their valence shell, driving them to form bonds to achieve this configuration.

Question 16

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

Accepted Answer

The formation of a disaccharide from two monosaccharides with the removal of a water molecule.

Question 17

Which of the following best explains why ions are important in the human body?

Accepted Answer

Ions conduct electrical currents in solution, which is essential for nerve impulse transmission and muscle contraction.

Question 18

Which of the following best describes the difference between fibrous and globular proteins?

Accepted Answer

Fibrous proteins provide structural support and are insoluble, while globular proteins are water-soluble and perform metabolic functions.

Question 19

Which of the following is a correct statement about the structure of an amino acid?

Accepted Answer

An amino acid contains an amine group, a carboxyl group, and a unique R group.

Chemistry Comes Alive: Essential Concepts for Anatomy & Physiology

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