Biology Paper 2

Question 1

Answer 1

D

Question 2

Answer 2

C

Question 3

Label this blood smear?

Answer 3

1-Plasma
2-Platelets
3- RBC
4-Neutrophil
5-Lymphocyte

Question 4

Answer 4

C

Question 5

State one methods by which tannase could be immobilised? (1 mark)

Answer 5

-Entrapment (1)

Question 6

Suggest why immobilised enzymes are more active over a range of PH values than free enzymes (3)

Answer 6

-Less easily denatured (1) as part of enzyme is not fully exposed to PH (1)
-Tertiary structure is supported by support material (1)

Question 7

State one disadvantage of using immobilised enzymes in industrial processes? (2)

Answer 7

-Higher set up costs (1)
-Fewer exposed active sites (1)

Question 8

What are the conditions for the hardy-weinberg principle to apply? (2)

Answer 8

-Population must be sufficiently large (1)
-Population must be randomly mating (1)

Question 9

Complete the table of the main differences between glucose and starch? (3)

Answer 9

Question 10

Polypeptides contain carbon, hydrogen, oxygen and nitrogen.
Name the other element present? (1)

Answer 10

-Sulfur (1)

Question 11

State the role of cytokines and opsonins in phagocytosis? (2)

Answer 11

-Cytokines: attract phagocytes to site of infection
-Opsonins: bind to pathogens and are recognised by phagocytes