Topic 3 - DNA

Question 1

What is DNA made up of

Answer 1

Nucleotides

Question 2

What is DNA

Answer 2

Strands of polymer made up of repeating nucleotides

Question 3

What does a nucleotide consist of

Answer 3

One sugar molecule, phosphate molecule and a base

Question 4

What does the sugar and phosphate molecules in the nucleotide form

Answer 4

Backbone

Question 5

What joins to each sugar molecule

Answer 5

A,T,C,G

Question 6

What are the complementary base pairings

Answer 6

A and T

C and G

Question 7

What are the complementary pairs joined together with

Answer 7

Weak hydrogen bonds

Question 8

What is the structure of a chromosome

Answer 8

Long, coiled up molecules of DNA found in the nucleus of eukaryotic cells

Question 9

How do you extract DNA from a fruit cell

Answer 9

1) mash the fruit and put into a beaker that contains detergent and salt
2) filter to get a froth and big bits out
3) add ice cold alcohol
4) fish out the stringy white precipitate with a rod

Question 10

Why is detergent used in extracting DMA from a fruit cell

Answer 10

Breaks down the cell membrane to release DNA

Question 11

Why is salt used in the extraction of fruit cells

Answer 11

Sticks DNA together