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A Level Biology: Homeostasis MCQs — Biology (page 2)

27 multiple-choice questions on A Level Biology: Homeostasis from Biology, each with the correct answer and, where available, a teacher's explanation. Read through them to revise the chapter, then practise the same questions one by one to test yourself.

26. Cells of the proximal convoluted tubule have many mitochondria to

  1. make urea
  2. store glucose
  3. filter blood
  4. provide ATP for active transport

Answer: D) provide ATP for active transport

Explanation: Na⁺/K⁺ pumps need ATP. AS & A Level Biology · Topic 14 Homeostasis · 14.1 Homeostasis in mammals

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27. High hydrostatic pressure in the glomerulus is created because

  1. the heart is close
  2. the efferent arteriole is narrower than the afferent arteriole
  3. the collecting duct is wide
  4. the renal vein is blocked

Answer: B) the efferent arteriole is narrower than the afferent arteriole

Explanation: Narrow outflow builds pressure. AS & A Level Biology · Topic 14 Homeostasis · 14.1 Homeostasis in mammals

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