Question 1

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

Accepted Answer

A molecule is formed by the chemical bonding of two or more atoms, which may be the same or different elements, while a compound is a molecule that contains at least two different elements.

Question 2

Which of the following best defines an isotope?

Accepted Answer

An atom with the same number of protons but a different number of neutrons.

Question 3

Which of the following is the correct definition of a solution?

Accepted Answer

A homogeneous mixture in which one substance (solute) is dissolved in another (solvent).

Question 4

Which type of bond is responsible for the attraction between water molecules?

Accepted Answer

Hydrogen bond

Question 5

A patient is given a solution of sodium chloride in water. What type of mixture is this, and why?

Accepted Answer

Solution, because the sodium chloride is completely dissolved in water.

Question 6

Which of the following chemical reactions is an example of a decomposition reaction?

Accepted Answer

$$ \mathrm{2H_2O_2 \rightarrow 2H_2O + O_2$} $$

Question 7

Which statement best differentiates between exergonic and endergonic chemical reactions?

Accepted Answer

Exergonic reactions release energy, while endergonic reactions absorb energy.

Question 8

Which process is responsible for joining two monosaccharides to form a disaccharide, and what is released during this process?

Accepted Answer

Dehydration synthesis; water is released.

Question 9

A buffer system in the blood helps maintain pH by:

Accepted Answer

Releasing or binding hydrogen ions ($$ \mathrm{H^+} ) as $$needed.

Question 10

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

Accepted Answer

Saturated fatty acids have no double bonds between carbon atoms, while unsaturated fatty acids have one or more double bonds.

Question 11

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

Accepted Answer

The sequence of amino acids in a polypeptide chain.

Question 12

A patient is diagnosed with a genetic disorder that affects the hydrogen bonding in their proteins. Which level of protein structure is most directly affected?

Accepted Answer

Secondary structure

Question 13

Which of the following best explains how enzymes speed up chemical reactions?

Accepted Answer

They lower the activation energy required for the reaction.

Question 14

Which of the following best describes the structure of DNA?

Accepted Answer

A double helix composed of two antiparallel strands held together by hydrogen bonds between complementary bases.

Question 15

Which base pairing is correct for DNA?

Accepted Answer

Adenine pairs with thymine, and cytosine pairs with guanine.

Question 16

Which of the following best describes how ATP is used to produce energy in cells?

Accepted Answer

ATP is hydrolyzed to ADP and inorganic phosphate, releasing energy for cellular work.

Question 17

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

Accepted Answer

$$ \mathrm{C$$_{12}$$H_{22}O$$_{11} + H_2O \rightarrow 2C_6H_{12}$$O_6$$} $

Question 18

Which of the following best differentiates between a monosaccharide, disaccharide, and polysaccharide?

Accepted Answer

A monosaccharide is a single sugar unit, a disaccharide is two sugar units joined together, and a polysaccharide is a long chain of sugar units.

Question 19

A solution has a pH of 4. Which of the following best describes this solution?

Accepted Answer

It is acidic, with a high concentration of $$ \mathrm{H^+} $$ ions.

Question 20

Which of the following best explains why enzymes are specific to their substrates?

Accepted Answer

The active site of an enzyme has a unique shape that fits only specific substrate molecules.

Fundamental Chemistry Concepts for Anatomy & Physiology

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