#1: DNA-Structure, Function

Question 1

DNA function

Answer 1

Store heredity info

Determines structural/functional characteristics of organisms

Question 2

Structure: Nucleotides

Answer 2

Consist of a phosphate group (PO4), a sugar, and a nitrogenous base
Sugar is deoxyribose
Bases are adenine, cytosine, guanine, and thymine

Question 3

Pyrimidines

Answer 3

cytosine, thymine, and uracil

1 ring

Question 4

Purines

Answer 4

adenine and guanine

2 rings

Question 5

Bond formed between nucleotides…

Answer 5

phosphodiester bond

Question 6

Bonding Pairs

Answer 6

pyrimidine always binds with a purine

bonding pairs of bases: adenine and thymine, guanine and cytosine

adenine and thymine always form two hydrogen bonds
guanine and cytosine always form three hydrogen bonds

Question 7

Antiparallel

Answer 7

3’ is used to denote the sugar end of a nucleotide strand
5’ is used to denote the phosphate end of a nucleotide strand
one DNA strand runs 3’ to 5’ and the other strand runs 5’ to 3