Q1
Q2–5
Q6–8
Q9
Q9(e) Graph
Deshawn Williams – 13 Science
Q1 The substrate is molecule A.
Q2 B – enzymes lower activation energy by correct orientation.
Q3 C – inhibitor binds allosterically and changes active site.
Q4 B – lowest time at optimum temperature.
Q5 C – tertiary structure disrupted.
Q6 B – active sites saturated at X.
Q7 B – activation energy with enzyme.
Q8 D – reversible non-competitive at allosteric site.
Q9(a) Substrate: succinic acid.
(b) Malonic acid competes at active site; blocks succinic acid.
(c) Ethanol competes with ethylene glycol; reduces oxalic acid formation.
(d) Heavy metals bind –SH groups irreversibly; distort or block active site.
(e) Competitive: same Vmax lower initial rate. Non■competitive: lower Vmax.