2019 wrong

Question 1

Describe how a non-competitive inhibitor can reduce the rate of an enzyme-controlled reaction.

Answer 1

attach to site on enzyme other than active site
changes shape of active site and tertiary structure
active site and substrate no longer complementary so less substrate can bind

Question 2

what are the cell walls made of
plants
algae
fungi
Prokaryotes

Answer 2

cellullose
cellulose
chitin
muerin

Question 3

Give two ways the students would have ensured their index of diversity was representative of each habitat.

Answer 3

random samples
large number of samples

Question 4

why biodiversity decreases when farmers use larger fields.

Answer 4

more centre
less edge
fewer species

Question 5

Suggest and explain one advantage and one disadvantage to a farmer of replanting
hedges on her farmland.

Answer 5

greater biodiversity so increase in predator of pests
attracts tourists so more income
but reduced land for crop growth and income

Question 6

The scientists calculated a P value of 0.03 when testing their null hypothesis.
What can you conclude from this result? Explain your answer.

Answer 6

probability that result due to chance less than 0.05
reject null hypothesis
and then presence of …. does significantly affect …

Question 7

Describe the structure of the human immunodeficiency virus (HIV).

Answer 7

RNA
RT
AP
capsid
lipid envelope

Question 8

Suggest and explain one way the leaf growth of xerophytic plants would be different
from the leaf growth of sunflowers

Answer 8

slower growth
smaller no of stomata

Question 9

test for amylase

Answer 9

add biuret - purple
add starch - test for reducing sugar