2017

Question 1

give evidence that the cell is undergoing mitosis

Answer 1

chromosomes visible as they have condensed
each chromosome made up of two chromatids as dna has replicated
chromosomes arent arranged in HP which they would be if it was meiosis

Question 2

homologous pair of chromosomes

Answer 2

to chromosomes that carry the same genes

Question 3

Describe the method the student would have used
Start after all of the cubes of potato have been cut.

Answer 3

series of dilutions
water bath to control temp
dry cubes before measuring to remove excess water
measure mass of cubes at stated intervals
Regularly stir and shake to ensure all surfaces covered

Question 4

how to make bee collection ethical and identify which species each bee belongs to

Answer 4

must not harm bees and allow them to be released unchanged
use a key to identify species

Question 5

Formation of an enzyme-substrate complex increases the rate of reaction. Explain how

Answer 5

reduces activation energy due to bending of bonds

Question 6

A mixture of venoms from several snakes of the same species is used. Suggest why.

Answer 6

snakes within one species have different alleles and mutations
so different antibodies needed in venom

Question 7

Compare and contrast the structure and properties of triglycerides and phospholipids.

Answer 7

both contain ester bonds and glycerol
both insoluble in water
both contain C H O
phospholipids also contain P
triglyceride 3 fatty acids phospholipids have 2
triglycerides are hydrophobic but phospholipids have a hydrophobic and Phillic region