The DNA Structure

Question 1

___(He)____ experimented using a rough and a smooth strain of the bacteria __________

Answer 1

Frederick Griffith
Diplococcus pneumoniae

Question 2

Which strain contains polysacharide capsule (virulent, nonvirulent)

Answer 2

Virulent strain

Question 3

What was the transforming principle

Answer 3

DNA

Question 4

How many amino acids are in a protein

Answer 4

20 AA

Question 5

Which strain is virulent (III-S or II-R)

Answer 5

III-S

Question 6

3 steps in Hershey & Chase experiment

Answer 6

1. Infection
2. Blending
3. Centrifugation

Question 7

He showed the amounts of the four bases on DNA ( A,T,C,G)

Answer 7

Erwin Chargaff

Question 8

Chargaff’s Rule

Answer 8

*Adenine must pair with Thymine
*Guanine must pair with Cytosine

*The bases form weak hydrogen
bonds

Question 9

_________ took diffraction x-ray photographs of DNA crystals

Answer 9

Rosalind Franklin

Question 10

____ built the first model of DNA using Franklin’s x-rays

Answer 10

Watson & Crick

Question 11

What is the type of bond formed between pentose sugar and phosphate group

Answer 11

Covalent phosphodiester bond