Question 1

Which of the following best describes an atom?

Accepted Answer

The smallest unit of matter that retains the properties of an element.

Question 2

A neutral atom of sodium ($$Na) $$has an atomic number of 11 and a mass number of 23. How many neutrons does it contain?

Accepted Answer

12

Question 3

Which type of chemical bond is formed when electrons are transferred from one atom to another, resulting in the formation of oppositely charged ions?

Accepted Answer

Ionic bond

Question 4

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 5

Which of the following best explains why water is considered a polar molecule?

Accepted Answer

It has an uneven distribution of electrons, resulting in partial positive and negative charges.

Question 6

A solution has a pH of 3. Which of the following statements is true?

Accepted Answer

The solution is acidic and has a high concentration of hydrogen ions ($$H^+).$$

Question 7

Which of the following is a correct representation of a synthesis (anabolic) chemical reaction?

Accepted Answer

$$A + B \rightarrow AB$$

Question 8

Which of the following is NOT a major element found in the human body?

Accepted Answer

Sodium

Question 9

Which statement best describes a buffer in the context of acids and bases?

Accepted Answer

A buffer is a chemical system that resists changes in pH when acid or base is added.

Question 10

Which of the following best describes the process of hydrolysis?

Accepted Answer

A catabolic reaction that uses water to break up polymers into smaller subunits.

Question 11

Which of the following is the building block of proteins?

Accepted Answer

Amino acids

Question 12

Which of the following is true regarding RNA compared to DNA?

Accepted Answer

RNA contains uracil (U) instead of thymine (T).

Question 13

Which of the following best describes a covalent bond?

Accepted Answer

A bond formed when two atoms share one or more pairs of electrons.

Question 14

Which of the following is a correct description of a mixture?

Accepted Answer

A combination of two or more components with extremely small, evenly distributed particles.

Question 15

Which of the following is a correct statement about energy in the context of chemical reactions?

Accepted Answer

Kinetic energy is energy in motion, while potential energy is stored energy.

Question 16

Which of the following is a correct statement about acids?

Accepted Answer

Acids release hydrogen ions ($$H^+) $$when dissolved in water.

Question 17

Which of the following is a correct description of a hydrogen bond?

Accepted Answer

A weak attraction between partially positive and partially negative regions of molecules.

Question 18

Which of the following is a correct statement about carbohydrates?

Accepted Answer

Carbohydrates are composed of carbon, hydrogen, and oxygen and primarily function as fuel.

Question 19

Which of the following best describes the role of nucleotides in nucleic acids?

Accepted Answer

Nucleotides are the building blocks of DNA and RNA.

Question 20

A patient is given a solution with a pH of 9. What effect will this have on the concentration of hydrogen ions ($$H^+) in $$their blood?

Accepted Answer

The concentration of hydrogen ions ($$H^+) $$will decrease.

Atoms, Molecules, and Biochemistry Foundations in Anatomy & Physiology

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