2019 paper 2

Question 1

Name the molecule found in a cell membrane that is involved in moving ions by active transport

Answer 1

Proteins

Question 2

What name is given to the substance that an enzyme breaks down

Answer 2

Substrate

Question 3

Name the substance that must be present for yeast to respire aerobically

Answer 3

Oxygen

Question 4

If the temperature was below optimum what would happen to the enzymes?

Answer 4

The enzymes would no longer be active

Question 5

State a reason other than growth why cells continue to be produced throughout life

Answer 5

To replace tissues/organs

Question 6

What does the lacteal and blood capillary absorb

Answer 6

Lacteal- fatty acids
Blood capillary- Glucose

Question 7

Explain why having a large number of villi improves the efficency of absorption in the small intestine

Answer 7

Larger surface area for absorption

Question 8

How would you increase the reliability of these results

Answer 8

Repeat the experiment

Question 9

what is an indicator species

Answer 9

Species that by their presence or
absence indicate (levels of)
pollution/environmental quality

Question 10

Name the product of carbon fixation that is converted into starch

Answer 10

Sugar

Question 11

Name the structure in the source cell from which the required gene is extracted during the first stage of this process

Answer 11

Chromosome