11.1

Question 1

DNA is a nucleic acid composed of nucleotides

Answer 1

-nucleotides consist of
1. 5 carbon sugar called deoxyribose
2. Nitrogenous base (A,T,C, G)
3. Phosphate group (PO4)
Attached to a 5’ carbon of sugar

Question 2

Purines

Answer 2

Adenine and thymine (2 h bonds)

Question 3

Pyrmadines

Answer 3

Guanine and cytosine (3 h bonds)

Question 4

Nucleotides are linked together by

Answer 4

Phosphodiester bonds

Question 5

Phosphodiester bonds

Answer 5

Formed between the phosphate group of 1 nucleotide and the 3’ OH of another nucleotide

Question 6

Chargaffs rules

Answer 6

Amount of adenine=amount of thymine
Amount of cytosine=amount of guanine

Question 7

Maurice Wilkins/ rosalind Franklin

Answer 7

-Performed x ray diffraction studies to identify 3-D structure
-Discovered that DNA is helical
-DNA has a diameter of 2 nm and makes a complete turn of the helix every 3.4 nm

Question 8

Watson crick model of DNA

Answer 8

-deduced the structure of DNA using evidence from Franklin, chargaff, and others
-did not perform a single experiment related to DNA
-proposed a double helix structure
-2 nucleotide strands