DNA

Question 1

What is DNA function ?

Answer 1

Stores and transmits genetic info from one organism to next generation

Question 2

What is the DNA made of ?

Answer 2

• building blocks : nucleotide,5 carbon sugar ( deoxyribose ), Phosphate group, nitrogen base

Question 3

What are the 4 nitrogen bases ?

Answer 3

Adenine (A ) and Guanine (G)= purines

Cytosine (C) and Thymine (T)= pyrimidines

Question 4

Nucleotides bond together to create

Answer 4

Polymers

Question 5

Sugar and phosphate are attached by

Answer 5

Covalent bonds

Question 6

Nitrogen bases point outwards and attach toe ach other by

Answer 6

Hydrogen bonds (weaker )

Question 7

What nitrogen bases go together ?

Answer 7

A and T ( adenine and thymine )
C and G ( cytosine and thymine )

Question 8

C only pairs with G (3 hydrogen bonds ) because of

Answer 8

The complementary base pairing rule

Question 9

Why is DNA shaped like a twisted ladder ?

Answer 9

Because sugar and phosphate groups do not line up exactly

Question 10

What did Rosalind Franklin do ?

Answer 10

X-ray diffraction showed DNA helix was 2-3 strands

Question 11

What did Watson and Crick do ?

Answer 11

1953- exact structure double helix held together by nitrogen bases

Question 12

The 2 strands of DNA are arranged in ___ ____ ( ___ ___)

Answer 12

Opposite directions ( anti-parallel)

Question 13

The strands are identified (named ) by the numbered _____ located at the end of the strand

Answer 13

Carbon

Question 14

What does DNA stand for ?

Answer 14

Deoxyribose acid

Question 15

In which direction does DNA read ?

Answer 15

5’ - 3’

Question 16

___ and ___ make up the backbone of DNA

Answer 16

Sugar and phosphate