Question 1

Which of the following best describes the subatomic particles of an atom and their respective charges?

Accepted Answer

Protons (positive), neutrons (neutral), electrons (negative)

Question 2

The atomic number of an element is defined as:

Accepted Answer

The number of protons in the nucleus

Question 3

Valence electrons are important because they:

Accepted Answer

Determine the chemical reactivity and bonding properties of an atom

Question 4

A polar molecule is unique because:

Accepted Answer

It has an uneven distribution of charge, resulting in partial positive and negative ends

Question 5

Which equation best represents a dehydration synthesis reaction?

Accepted Answer

$$A + B \rightarrow AB + H_2O$$

Question 6

The pH scale is used to measure:

Accepted Answer

The concentration of hydrogen ions $$[H^+] in a $$solution

Question 7

A nucleotide is composed of which three components?

Accepted Answer

A phosphate group, a five-carbon sugar, and a nitrogenous base

Question 8

Which of the following compounds is considered inorganic?

Accepted Answer

NaCl (sodium chloride)

Question 9

Isotopes of an element differ in their:

Accepted Answer

Number of neutrons

Question 10

Which of the following best describes a triglyceride molecule?

Accepted Answer

Three fatty acids bonded to a glycerol molecule

Question 11

Which bases are complementary in DNA?

Accepted Answer

Adenine with thymine, cytosine with guanine

Question 12

A weak acid is characterized by which of the following equations?

Accepted Answer

$$HA \rightleftharpoons H^+ + A^-$$

Question 13

How are saturated fats different from unsaturated fats at the molecular level?

Accepted Answer

Saturated fats have no double bonds between carbon atoms; unsaturated fats have one or more double bonds

Question 14

Which vitamin is produced in the skin upon exposure to sunlight?

Accepted Answer

Vitamin D

Question 15

What are the building blocks of proteins?

Accepted Answer

Amino acids

Question 16

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

Accepted Answer

They lower the activation energy required for a reaction to occur

Question 17

Hydrogen bonds in water are responsible for which of the following properties?

Accepted Answer

High surface tension

Question 18

Where are electrons and protons located in an atom?

Accepted Answer

Protons are in the nucleus; electrons are in orbitals around the nucleus

Question 19

A patient is diagnosed with acidosis. If their blood pH is 7.1, which of the following best describes their condition?

Accepted Answer

Their blood has a higher concentration of $$H^+$$ ions than normal

Question 20

Which of the following best explains why water is an excellent solvent for ionic compounds?

Accepted Answer

Water is polar and can surround and separate ions due to its partial charges

Fundamental Concepts in Chemistry and Biochemistry for Anatomy & Physiology

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