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Biology · May / June 2024 · Paper 42 · Question 1

0610

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Fungal cells and plant cells contain mitochondria.

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  • 1(a)(i)[1]

    aerobic respiration ;

  • 1(a)(ii)[1]

    any one from:

    (composition of) cell wall OR cell walls (in plants) are made of cellulose / cell walls in fungi are made of chitin ; (presence of) chloroplasts OR chlorophyll (in plants) ; ora AVP ;

  • 1(b)[2]

    C6H12O6 → 2C2H5OH + 2CO2 ;;

  • 1(c)(i)[3]

    1.6 cm3 per minute ;;;

  • 1(c)(ii)[1]

    any one from:

    to prevent oxygen entering (solution) / to keep it anaerobic ; allow carbon dioxide to (still) escape ;

  • 1(c)(iii)[1]

    (all) sugar / glucose / substrate, has been used up / broken down / run out / AW (by the yeast cells) ;

  • 1(c)(iv)[3]

    any three from:

    enzymes / active site, have denatured ;

    enzyme / active site, has changed shape ;

    (denatured) active site, does not fit / does not bind / is not complementary to, substrate ;

    (denatured enzymes / dead yeast) cannot, respire (anaerobically) ;

  • 1(d)[1]

    bread(-making) / to make dough rise / leavening (agent) / AVP ;

  • 1(e)[1]

    methane / AVP ;

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