Page 45 - Q & A STPM 2022 Biology

Answers

STPM Model Paper 1 964/1 Section C
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18. (a)
Section A NH
1. D 2. D 3. C 2
4. B 5. A 6. A N C C N
7. D 8. A 9. D CH
10. A 11. D 12. C O O O HC N C N
13. C 14. A 15. B O—P—O—P—O—P—OCH O
2
O O O H H H H
Section B OH OH
16. (a) Paper chromatography
(b) Spot of concentrated – The structure consists of
chlorophyll extract. a purine base (adenine)
(c) (i) R value of A = 9.0/9.7 = attached to the carbon
f
0.93 atom 1 of a pentose sugar /
R value of C = 6.1/9.7 = ribose.
f
0.63 – Three phosphate groups
(ii) The R value can be are attached at the carbon
f
used as a comparison atom 5 of the pentose
to identify unknown sugar.
compounds in a mixture. – Terminal phosphate group
(d) – Molecular size has high energy level.
– Solubility – The structure can be
– Adsorption broken down/hydrolyse
into ADP +P+energy and
– Adhesion of the is a reversible reaction.
i
macromolecules to the
chromatography paper (b) – Occur in the inner
(choose any two answers) membrane of
mitochondria.
17. (a) Condition : Anaerobic – NADH/FADH is oxidised.
Location : Cytoplasm – Remove H ion/ H split
+
(b) Condition : Aerobic into H ion and electron.
+
Location : Matrix of the – The first electron acceptor
mitochondrion for NADH is NADH
(c) P : Ethanol dehydrogenase and FADH -
Q : Lactic acid succinate dehydrogenase.
(d) The pathways are important – As the electrons flow
because NAD is required for through the carriers, the
+
glycolysis to produce NADH. energy is released.
The NADH is oxidised to
regenerate NAD for glycolysis
+
to continue in living cells.

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