chpt 12 structure of DNA molecules

Question 1

who discovered the structure of DNA molecules?

Answer 1

James Watson and Francis Clark

Question 2

the structure of DNA molecules has how many strands of nucleotides?

Answer 2

2 strands

Question 3

nucleotides in each strand are held together by what?

Answer 3

phosphodiester bonds

Question 4

each strand has what free group on the 5’ C end?

Answer 4

phosphate group

Question 5

what free group is on the 3’ C end?

Answer 5

hydroxyl group

Question 6

2 strands aligned antiparallel around each other is what?

Answer 6

double helix

Question 7

the double helix’s are held together by what?

Answer 7

hydrogen bonds from complimentary base pairs

Question 8

A & T are paired with what?

Answer 8

G& C

Question 9

sugars and phosphate groups aligned along outer edges of the helix are called what?

Answer 9

sugar-phosphate backbone

Question 10

standard DNA is a what type of helix?

Answer 10

right-handed helix

Question 11

how many base pairs are there in each complete turn of the helix?

Answer 11

10.4 base pairs

Question 12

a DNA double helix has how many groves?

Answer 12

2

Question 13

what are the 2 groves called?

Answer 13

minor and major groves