bio paper 2018

Question 1

give two pieces of evidence to suggest that this cell was undergoing mitosis.

Answer 1

• the chromosomes are visible because they are condensed

- each chromosome is made up of two chromatids as DNA has been replicated

Question 2

suggest one way the structure of the chromosomes could differ along its length to result in the stain binding more in some areas

Answer 2

differences in DNA base sequences.

Question 3

what is a homologues pair of chromosomes

Answer 3

two chromosomes that carry the same genes

Question 4

give two ways in which the arrangement of prokaryotic DNA is different from the arrangement of the human DNA.

Answer 4

• prokaryotic DNA is circular whereas human DNA is linear

- prokaryotic DNA only has one DNA molecule whereas human DNA has more.

Question 5

describe a method the student would have used to obtain the results in figure 3. start after all the cubes have been cut

Answer 5

• cut all surface of eight cubes to ensure all of the potato is exposed to sucrose solution
• have the test tubes in a water bath to reach room temperature and keep it at room temperature
• pat dry when taking potato out of test tube so it does not affect the results
• measure the mass of cubes at state time intervals