dna ch 12 quiz

Question 1

what did rosalind franklin accomplish

Answer 1

used x-ray crystallography to prove that dna is a helix

Question 2

what did watson and crick accomplish

Answer 2

proposed the double helix structure

Question 3

what is dna’s role in a cell

Answer 3

holds information

Question 4

what is a double helix

Answer 4

2 strands running in opposite directions like a twisted ladder

Question 5

what is the backbone made of

Answer 5

deoxyribose and phosphate

Question 6

base pair rules

Answer 6

adenine=thymine

cytosine=guanine

Question 7

what type of bond holds together base pairs

Answer 7

weak hydrogen bonds

Question 8

what makes up a nucleotide

Answer 8

deoxyribose
phosphate
nitrogen base

Question 9

dna eukaryotes

Answer 9

has a nucleus
has many replication forks
is linear
found in humans

Question 10

dna prokaryotes

Answer 10

no nucleus
one replication fork
structure is circular

Question 11

helicase

Answer 11

separates dna

Question 12

dna polymerase

Answer 12

fills in matching nitrogen bases

Question 13

semi conservative replication

Answer 13

2 dna models made of half old and half new material