Lecture 11 and 12

Question 1

What bases are Purines

Answer 1

Adenine and Guanine

Question 2

What bases are pyrimidines

Answer 2

Thymine, Cytosine and Uracil

Question 3

Describe the Purine structure

Answer 3

A 5 and 6 ring carbon joined together to make one molecule

Question 4

Describe the Pyrimidine structure

Answer 4

a 6 ring carbon

Question 5

Adenine and Thymine connect via how many Hydrogen bonds

Answer 5

Adenine and Thymine connect via 2 hydrogen bonds

Question 6

guanine and cytosine connect via how many bonds

Answer 6

3 h bonds

Question 7

what are chargiffs rules

Answer 7

A-T and C-G,, and The composition of DNA varies between species

Question 8

what else did chargaff discover

Answer 8

there is large variation in DNA, this could be the genetic material

Question 9

what did franklin and wilkins discover

Answer 9

DNA has a helical structure, this was shown in photo 51
the bases are perpendicular to the DNA strand
Double-stranded helix

Question 10

what did watson and crick discover

Answer 10

determined that C and T are pyrimidines. A and G are purines. they thus determined A - T and C- G works structurally and chemically to give a constant diameter double helix.