DNA

Question 1

What are the monomers of DNA called? (1)

Answer 1

the monomers from which DNA is made are called nucleotides

Question 2

What is a nucleotide molecule made up of? (3)

Answer 2

-A phosphate
-a sugar
-a base

Question 3

What are the different bases? (4)

Answer 3

Cytosine, thymine, adenine and guanine

Question 4

How can the linking of nucleotides be seen as a polymerisation reaction? (1)

Answer 4

Two nucleotides can link together when an -OH group of a phosphate on one nucleotide reacts with an -OH group on a sugar molecule on another nucleotide to eliminate a molecule of water.

Question 5

What is it called when more than two nucleotides link? (1)

Answer 5

Forms a polymer chain usually called a phosphate backbone.

Question 6

What is DNA sequencing? (1)

Answer 6

Reading the DNA sequence and interpreting it

Question 7

What is the double helix? (1)

Answer 7

ENA exists as two strands held together by hydrogen bonding, the bases adenine and thymine can hydrogen bond with each other as can guanine and cytosine.

Question 8

1
What occurs during cell division? (1)

Answer 8

The hydrogen bonds of the DNA double helix break and the strands start to unravel but the covalently bonded chain remains intact retaining the sequence of bases.

Question 9

2
What occurs in cell division? (1)

Answer 9

the cell contains a mixture of separate nucleotide molecules. The move in and pair up with the newly - exposed bases then link together by phosphate-sugar bonding. This results in two double helix molecules each exactly the same as the original one