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Question 1

Chromosomes

Answer 1

A threadlike structure within a cell’s nucleus that contains DNA that is passed from one generation to the next.

Question 2

Double helix

Answer 2

The shape of a DNA molecule.

Question 3

Nitrogen bases

Answer 3

Molecules that contain nitrogen and other elements.

Question 4

Adenine

Answer 4

a compound that is one of the four constituent bases of nucleic acids. A purine derivative, it is paired with thymine in double-stranded DNA.

Question 5

Thymine

Answer 5

a compound that is one of the four constituent bases of nucleic acids.

Question 6

Guanine

Answer 6

a compound that is one of the four constituent bases of nucleic acids.

Question 7

Cytosine

Answer 7

a compound that is one of the four constituent bases of nucleic acids.

Question 8

Gene

Answer 8

A sequence of DNA that determines a trait and is passed from parent to offspring.

Question 9

DNA Replication

Answer 9

Before a cell divides, the process in which DNA copies itself.

Question 10

RNA

Answer 10

ribonucleic acid, a nucleic acid present in all living cells. Its principal role is to act as a messenger carrying instructions from DNA for controlling the synthesis of proteins, although in some viruses RNA rather than DNA carries the genetic information.

Question 11

Uracil I

Answer 11

a compound found in living tissue as a constituent base of RNA. In DNA its place is taken by thymine.

Question 12

DNA

Answer 12

Deoxyribonucleic acid; the genetic material that carries information about an organism and is passed from parent to offspring.