Advanced level 2023 south west regional mock biology 2
Advanced level 2023 south west regional mock biology 2
(i) What Ita protein? (p
(II) How is the structure of the protein adapted to its many functions?
(b) Why art amino acids said to be amphotetfc?
(c) Outline the functions of lipids in the life of plants and animals.
(4.5, 3, 8 marks)
(Total “ 20 marks)
2. (a) State the properties of enzymci,
(b) Explain the following types of enzyme Inhibition.
Noncompetitive Inhibition
Allosteric inhibition.*-
(c) Explain how temperature nnd substrate concentration affect the rale of enzyme catalyzed reactions.
(5, 6, 9 mirks)
(Total » 20 marks)
3. (a) Define the following terms:
Parthenogenesis. ‘
Cortical reaction.
Acrosome reaction.
(b) Explain the process of Spermatogenesis in man.
(c) Stale the advantages of vegetative propagation.
(d) Differentiate between mitosis and mciosis
(6, 6, 3, 5 murks)
(Total = 20 murks)
m
4. (a) Draw the structure of a nephron ami its associated blood vessels. f
(b) Describe the process of urine formation in mammals.
(c) What is the role of untidiuretic hormone (Vasopressin) in the formation of a concentrated urine?
(7,10.3 marks)
(Total = 20 marks)
5. (a ) Outline the difference between the following:
(i) l;ood chain nnd food web.
/ ( ii) Pyramid ofbiomass and pyramid of energy,
(b) Explain the following ecological concepts.
(i) Ozone layer depletion.
(ii) Acid rain.
(iii) Eutrophication /
(8, 12 marks)
(Total = 20 marks)
(y fa) Describe the main stages of (he Calvin eyelet
ib ) Distinguish between ,
(i) Mitochondria and chloroplast.
(ii) G* and Ci plants.
ib ) What is the role of NADP in photosynthesis?
(6, 10, 4 marks) 15
(Total = 20 marks)
7* (a) Define the following terms:
( i ) Water potential.
( ii) Solute potential.
( h ) Describe the path taken by water m an angiosperm plant from the soil into ami across the roots,
(c) Discuss FIVE forces that move water and mineral tons from the roots to the leaves of plants.
! P
m
(J, 6 )Q marks)
(Total = 20 marks)
s. m) Define the term fermentation as used in biotechnology.
Hou can a Transgenic bacterium be cultured in an industrial fermenter to produce a useful
product?
(b)E>plain the rule of microorganisms in the production of:
(ii)
( i ) Cheese .
( ii) Yoghourt (2, 8, 5, 5 marks)
(Total = 20 marks)
