DNA

Question 1

Maurice Wilson and Rosalind Franklin

Answer 1

conducted xray crystallography studies of DNA and proteins, couldn’t figure out whether DNA or proteins carried genetic info

Question 2

James Watson and Francis Crick

Answer 2

won Nobel Prize for structure of DNA

Question 3

Structure of DNA

Answer 3

• double helix
• 4 nucleotides
• deoxyribonucleic acid
• eukaryotes have linear DNA, prokaryotes have circular DNA

Question 4

width of DNA double helix

Answer 4

2.0 nm

Question 5

distance between bases

Answer 5

0.34 nm

Question 6

length of 1 complete turn of the helix

Answer 6

3-4 nm

Question 7

DNA nucleotide consist of

Answer 7

phosphate group, deoxyribose sugar, nitrogenous base (1 of 4)

Question 8

Thymine (T)

Answer 8

• single ring (pyrimidine)
• bonds with adenine (A)
• 2 H-bonds
• Uracil replaces thymine in RNA

Question 9

Adenine (A)

Answer 9

• double ring (purine)
• bonds with thymine (T) in DNA
• bonds with uracil (U) in RNA
• 2 H-bonds

Question 10

Cytosine (C)

Answer 10

• single ring (pyrimidine)
• bonds with guanine (G)
• 3 H-bonds

Question 11

Guanine (G)

Answer 11

• double ring (purine)
• bonds with cytosine (C)
• 3 H-bonds

Question 12

5’ end

Answer 12

phosphate group

Question 13

3’ end

Answer 13

hydroxyl group

Question 14

the two strands of a DNA molecule are…

Answer 14

antiparallel