A-Level Biology Year 1 – Biological Molecules & Enzymes: Complete Answers

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AQA, OCR, Edexcel

A Level

A Level Biology
Biological Molecules and
Enzyme Answers

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Page 1

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M1.(a) C. 1

(b) E. 1

(c) 1. Active ksite k(of kenzyme) khas k(specific) kshape k/ ktertiary kstructure k/
kactive ksite kcomplementary kto ksubstrate k/ kmaltose;
Reject kactive ksite kon ksubstrate.
kMust khave kidea kof kshape
Assume k“it” k= kmaltase
Accept k(specific) k3D kactive ksite
kReject khas ksame kshape


2. (Only) kmaltose kcan kbind k/ kfit;
Accept k“substrate” kfor k“maltose”

3. To kform kenzyme ksubstrate
kcomplex.
Accept kE−S kcomplex 3
[5]

M2. (a) (i) Changes kshape kof kantitrypsin;
Reference kto khydrogen/ionic/disulfide kbonds;
No klonger kattaches kto/interacts/ kreacts kwith ktrypsin;
Accept kprotease
2

(ii) Higher kthe kconcentration kof khydrogen kperoxide, kmore kamino
kacids/ kproteins kaffected;
More kantitrypsin kmolecules kchange kshape;
2

(b) (Longterm ksmokers) kinhale ka klot kof khydrogen kperoxide;
kSmokers khave kmore kactive kenzyme kthat kdamages klung
ktissue; kReducing kgas kexchange ksurface;
2
kmax [6]

M3. (a) (i) condensation;
1

(b) (i) D;
1

(ii) C;
1

(iii) A;
1

(c) absence kof ka kdouble
kbond; kin kthe
k(hydrocarbon) kchain;
unable kto kaccept kmore khydrogen k/ ksaturated kwith 2
khydrogen; kmax [6]




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