Question 1

Which of the following best describes the subatomic particles of an atom?

Accepted Answer

Protons, neutrons, and electrons, each with distinct charges and locations within the atom.

Question 2

If an atom has an atomic number of 8, what does this indicate?

Accepted Answer

The atom has 8 protons in its nucleus.

Question 3

Valence electrons are important because:

Accepted Answer

They determine the chemical reactivity and bonding properties of an atom.

Question 4

Which of the following best describes a polar molecule?

Accepted Answer

A molecule with an uneven distribution of charge due to differences in electronegativity.

Question 5

A dehydration synthesis reaction can be represented by which of the following equations?

Accepted Answer

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

Question 6

Which statement about the pH scale is correct?

Accepted Answer

A solution with $$pH = 3 is $$more acidic than a solution with $$pH = 7.$$

Question 7

What is a nucleotide made of?

Accepted Answer

A phosphate group, a sugar, and a nitrogenous base.

Question 8

Which of the following compounds is considered inorganic?

Accepted Answer

NaCl (sodium chloride)

Question 9

Which statement about isotopes is correct?

Accepted Answer

Isotopes of an element have the same number of protons but different numbers of neutrons.

Question 10

Which of the following is NOT a major type of biological macromolecule?

Accepted Answer

Minerals

Question 11

Triglycerides are composed of:

Accepted Answer

One glycerol molecule and three fatty acids.

Question 12

In DNA, which bases are complementary?

Accepted Answer

Adenine pairs with Thymine; Guanine pairs with Cytosine.

Question 13

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

Accepted Answer

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

Question 14

Which equation correctly represents the dissociation of a weak acid in water?

Accepted Answer

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

Question 15

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

Accepted Answer

Vitamin D

Question 16

What are the building blocks of proteins?

Accepted Answer

Amino acids

Question 17

Which of the following is a function of enzymes in biological systems?

Accepted Answer

They lower the activation energy of chemical reactions.

Question 18

Hydrogen bonds in water molecules are responsible for which property?

Accepted Answer

High surface tension

Question 19

Where are electrons and protons located in an atom?

Accepted Answer

Protons are in the nucleus; electrons are in orbitals surrounding the nucleus.

Question 20

Which of the following is a multi-step process involving both dehydration synthesis and hydrolysis?

Accepted Answer

The digestion and absorption of dietary proteins, where hydrolysis breaks down proteins into amino acids and dehydration synthesis forms new peptide bonds during protein synthesis.

Fundamental Concepts in Anatomy & Physiology: Chemistry and Biomolecules

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