12.1-12.3

Question 1

Nitrogen Base

Answer 1

a nitrogen-containing organic compound that has the chemical properties of a base, especially a pyrimide or purine (p. 329)

Question 2

Double Helix

Answer 2

twisted ladder shape, formed by two strands of nucleotides twisted around each other (p. 330)

Question 3

DNA

Answer 3

deoxyribonucleic acid (p. 337)

Question 4

Semiconservative Replication

Answer 4

parental strands of DNA separate, serve as templates, and produce DNA molecules that have one strand of parental DNA and one strand of new DNA (p. 333)

Question 5

Mutation

Answer 5

a permanent change that occurs in a cell’s DNA (p. 345)

Question 6

Variation

Answer 6

a difference or deviation in structure or character from others of the same species or group (p. 337)

Question 7

Base Pairing

Answer 7

the process of binding separate DNA sequences by base pairs (p. 329)

Question 8

DNA Polymerase

Answer 8

catalyzes the addition of appropriate nucleotides to the new DNA strand (p. 334)