AQA A2 Biology B12 Respiration Kerboodle Answers

 

Banner 1 C12 Respiration

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Practice Questions

 

• (a)

Answer:      (b) Answer: ADP + Pi → ATP (c)   Answer:

1. Energy released in small/suitable amounts;
2. Soluble;
3. Involves a single/simple reaction;

  (d) Answer:

1. ATP is unstable;
2. ATP cannot be stored / is an immediate source of energy;
3. Named process uses ATP ;
4. ATP only releases a small amount of energy at a time

 

• (a) Answer:

(b)   Answer: 1. Glucose is used/broken down during glycolysis/in cytoplasm;

2. Glucose cannot cross mitochondrial membrane(s) / pyruvate can cross mitochondrial membrane(s);

• Answer: Is a competitive inhibitor / attaches to active site;

2. Reduces/prevents enzyme-substrate/E-S complex forming;

• Answer:

1. Krebs cycle inhibited;
2. NAD/Coenzyme/FAD not/less reduced;
3. Hydrogens not passed to ETC;
4. Oxygen used as final/terminal (electron) acceptor;

 

 

• Answer: 8;

 

• (i)

Answer: 1. Aerobic respiration;

2. Increase in uptake (of oxygen) with growth/reproduction/division of yeast cells; 3. Glucose/nutrients/oxygen decreases/becomes limiting / cells die / ethanol/toxins form / heat produced / anaerobic respiration occurs;

  (ii) Answer:

1. Allow description e.g. respiration using oxygen
2. Accept ‘oxidative phosphorylation’
3. Ignore any reference to time
4. Accept decrease in oxygen being linked to oxygen being ‘used up’ or equivalent

 

• Answer: Oxygen uptake decreases/stopped;

2. Oxygen is final (electron) acceptor/combines with electrons (and protons);
3. Ethanol produced sooner / more ethanol produced;

      4 (a) Answer:

1. Affects enzymes;
2. Affects respiration;
3. Affects volume/pressure of gases;
4. Affects readings

(b)(i) 4 (b) (i)  1. Oxygen taken up/used (by seeds);

2. Carbon dioxide (given out) is absorbed by solution/potassium hydroxide;
3. Decrease in volume / pressure (inside flask);

4 (b) (ii) Answer:

• (b) (ii) 03 mm³;

(b) Answer: 4 (c) 1. Remains the same; 2. No oxygen uptake/used; Banner 4

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