Topic B

Question 1

What are the three parts of nucleic acids

Answer 1

1) Pentose sugar- ribose (RNA) or deoxyribose (DNA)
2) Nitrogenous base - purine (Guanine, Adenine)
Pyramided (cytosine, thymine (and uricil)
3) Phosphate

Question 2

Nucleosides

Answer 2

Molecules of a sugar and base

Question 3

Deoxyribonucleosides

Answer 3

2-deoxyribose sugar + purine / pyramided base

Question 4

Nucleotide

Answer 4

Nucleoside molecule and phosphate (s)
The phosphate group is attached to the carbon 5’ of the ribose and deoxyribose sugars.

All three components: base sugar and phosphate

Question 5

Polynucleotide

Answer 5

Joining mononucleotides together

Question 6

Base binds to ____ of deoxyribose/ ribose

Answer 6

C’1

Question 7

Erwin chargaff

Answer 7

Analyzed overall quantities of the four nitrogenous bases in various organism.
Rule: %A=%T
%C=%G

%purines (A+G)= %pyrimidine (C+T)

C+GNOT= A + T

Question 8

Rosalind Franklin

Answer 8

DNA molecules were cylindrical and about 2nm in diameter
0.34nm periodicity suggested that bases were stacked like pennies on top of one another
X-shape pattern indicates helical structure->helical
Wikins shows Watson the X-ray image without her permission