Ka 1

Question 1

Describe structure of DNA nucleotide

Answer 1

Phosphate
Deoxyribose sugar
Base

Question 2

Describe the structure of sugar phosphate backbone

Answer 2

Deoxyribose sugar and phosphate joined by covalent bonds
Phosphate at 5’ end
Deoxyribose sugar at 3’ end

Question 3

Describe the structure of a double helix

Answer 3

Hydrogen bonds between complementary base pairs
Double stranded anti parallel structure
Phosphate at 5’ end
Deoxyribose sugar at 3’ end

Question 4

Describe what forms the genetic code

Answer 4

The base sequence of DNA

Question 5

Organisation of prokaryote DNA

Answer 5

No nucleus
Single circular chromosomes
Smaller circular plasmids

Question 6

Organisation of eukaryote DNA

Answer 6

Linear chromosomes in a nucleus tightly coiled and packaged around proteins called histones
Circular chromosomes in mitochondria and chloroplast

Question 7

What type of cell yeast is

Answer 7

It’s a special type of eukaryote as it has a nucleus but also contains plasmids

Question 8

What is the name given to a DNA molecule

Answer 8

Double helix

Question 9

How are the two DNA strands held together

Answer 9

Held together by hydrogen bonds between the complementary base pairs

Question 10

Name the associated protein used in DNA storage in the nucleus

Answer 10

Histones