21-30

Question 0

Covalent bond

Answer 0

forms when electrons are shared between atoms.

Question 1

Ionic bond

Answer 1

formed when one or more electrons are transferred from one atom to
another.

Question 2

Valence electrons

Answer 2

the electrons in the outer shell or energy level that are available
for bonding.

Question 3

pH

Answer 3

the measure of acidity or alkalinity of a solution.

Question 4

Acid

Answer 4

a substance that dissolves in water to release a hydrogen ion. (H+)

Question 5

Base

Answer 5

a substance that dissolves in water to release a hydroxide ion. (OH-)

Question 6

Deoxyribonucleic Acid (DNA)

Answer 6

the nucleic acid that contains all genetic

information for a cell.

Question 7

Double helix

Answer 7

The shape of DNA that resembles a spiral staircase or a twisted ladder.

Question 8

Nucleic Acid

Answer 8

The building block of living organisms that passes genetic information from one generation to the next. (e.g. DNA)

Question 9

Nucleotide

Answer 9

a monomer of nucleic acid; consisting of a sugar, phosphate, and a nitrogen base. (e.g. A,T,G,C)