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Course: Edexcel A Level Biology A (SNAB) 9BI0
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Edexcel A Level Biology A (SNAB) 9BI0

Topic 1 · Lifestyle, Health and Risk

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Topic 2 · Genes and Health

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Topic 3 · Voice of the Genome

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Topic 4 · Biodiversity and Natural Resources

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Topic 5 · On the Wild Side

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Topic 6 · Immunity, Infection and Forensics

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Topic 7 · Run for your Life

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Topic 8 · Grey Matter

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Quiz

7.3.1 Homeostasis- An Overview – Unit exam questions

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  • Questions count: 12
  • Passing grade: B+
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1.
Which molecule combines with the acetyl group at the start of the Krebs cycle?
Oxaloacetate
Citrate
Pyruvate
Coenzyme A
2.

Too little exercise increases the risk of

wear and tear on joints
obesity, coronary heart disease and type 2 diabetes
suppressed immunity from overtraining
none of these
3.

Fast twitch fibres

have many mitochondria
are red
are used for endurance
contract rapidly, rely mainly on anaerobic respiration and fatigue quickly
4.
Which pairing of stage and location is correct?
Glycolysis — inner membrane
ETC — cytoplasm
Krebs cycle — cytoplasm
Krebs cycle — mitochondrial matrix
5.
Fast twitch fibres have:
Many mitochondria and much myoglobin
Rich capillary supply
Resistance to fatigue
Few mitochondria and rely on anaerobic respiration
6.
How many turns of the Krebs cycle occur per glucose molecule?
1
2
3
6
7.

Slow twitch muscle fibres have

many mitochondria, much myoglobin and a rich capillary supply
few mitochondria
little myoglobin
mainly anaerobic respiration
8.

Lactate after exercise is

excreted in urine
stored in muscle permanently
converted back to pyruvate and oxidised, or converted to glycogen in the liver
converted to fat
9.
Heart rate before and after a sudden fright is shown. Which hormone explains the change?
Insulin
Adrenaline
Oestrogen
Glucagon only
10.

On an ECG, the QRS complex represents

atrial depolarisation
ventricular repolarisation
atrial repolarisation
ventricular depolarisation
11.
What is the cause of the cramps you feel in your muscles during strenuous exercise?
What is the cause of the cramps you feel in your muscles during strenuous exercise?
Lactic acid fermentation
Alcohol fermentation
Chemiosmotic coupling
Too much oxygen delivery to the muscles
Oxidative phosphorylation
12.
Adrenaline increases heart rate and blood glucose. True or false?
False
False, it lowers both
True only during sleep
True
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Part of Topic 7 · Run for your Life — see every lesson and quiz in this unit.
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