Lecture 28

Question 1

James watson

Answer 1

american chemist

Question 2

Francis Crick

Answer 2

english molecular biologist

Question 3

Rosalind franklin

Answer 3

British chemist and microphotographer

Question 4

Maurice Wilkins

Answer 4

british researcher; discovered how to prepare uniformly oriented DNA fibers

Question 5

Linus Pauling

Answer 5

was completely wrong about the structure of DNA

Question 6

xray crystallography

Answer 6

x ray diffraction; crystals of a molecule are bombarded with a beam of xrays; the rays are bent (diffracted) by the molecules and the pattern is recorded on photographic film

Question 7

Erwin Chargaff

Answer 7

nucleotide composition of DNA molecules vary in complex ways suggested that DNA was not a simple repeating polymer; discovered that ratio of A= ratio of T and ratio of C = ratio of G

Question 8

Ball and stick models

Answer 8

watson and crick onoly built models and were viewed as lazy; watson went to franklin results report lecture as a spy and built a model but forgot the water content

Question 9

X pattern

Answer 9

Franklin discovered the helix through the picture coming out looking like an X, but wilkins shows watson his picture; watson figured out helix based on that

Question 10

nucleotide

Answer 10

3 main components: 5 carbon sugar, phosphate group (makes it an acid), and nitrogenous base

Question 11

Adenine, Guanine

Answer 11

purine bases

Question 12

Cytosine, thymine, uracil

Answer 12

pyrimidine bases

Question 13

double helix

Answer 13

very stable with spacing of 3.4 angstroms

Question 14

phosphodiester backbone

Answer 14

composed of alternating sugar and phosphate groups