plumiUrea and ultrafiltration: Edexcel International A Level Biology questions
Edexcel International A Level Biology past-paper questions on 7.4.4 Urea and ultrafiltration, 2019–2025, with mark schemes and examiner’s reports where available.
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Q1(b)
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All 13 questions on Urea and ultrafiltration, as a list
- January 2025, Unit 5, Q1(b) (3 marks): Excess proteins are broken down into amino acids. Describe what happens to these amino acids. (3)
- January 2025, Unit 5, Q3(a)(i) (1 mark): The afferent arteriole leading to the glomerulus is wider than the efferent arteriole leaving the glomerulus. Which describes the effect that this produces? (1)
- January 2025, Unit 5, Q3(a)(ii) (1 mark): In each hour, the kidneys will filter 6 000 cm3 of blood. How much blood will be filtered in 24 hours? (1) A 124 dm3 B 144 cm3 C 144 dm3 D 1 440 cm3
- October 2024, Unit 5, Q6(d)(ii) (2 marks): The Bowman’s capsule of a healthy kidney filters up to 7.5 g of glucose per hour. Calculate the rate of glucose filtration in milligrams per second. (2) Answer
- June 2023, Unit 5, Q5(a)(i) (1 mark): Which substances are filtered from the blood in the Bowman’s (renal) capsule of a healthy individual? (1) A glucose and prothrombin B glucose and urea C glycoge
- June 2023, Unit 5, Q5(a)(ii) (1 mark): Which part of the Bowman’s (renal) capsule prevents plasma proteins from being filtered out of the bloodstream? (1) A basement membrane B smooth muscle of the c
- June 2022, Unit 5, Q2(a)(ii) (1 mark): Which substances are normally filtered from the blood in the Bowman’s capsule? (1) A amylose and glucose B glucose and sodium chloride C potassium ions and haem
- June 2022, Unit 5, Q2(c) (1 mark): Urea is produced by the metabolic breakdown of some organic molecules. Which statement describes the production of urea? (1) A in the kidneys from excess amino
- October 2021, Unit 5, Q4(c)(i) (3 marks): Explain how small molecules like creatinine are filtered from the blood in the glomerulus. (3)
- October 2021, Unit 5, Q4(c)(ii) (1 mark): In 15 hours, a person excreted 1960 mg of creatinine in the urine. Calculate the GFR for this person. Give your answer to 3 significant figures. (1) Answer
- June 2021, Unit 5, Q4(b)(i) (1 mark): Name the process by which the fluid moves from the plasma into the renal tubule (nephron). (1)
- October 2020, Unit 5, Q2(a)(ii) (1 mark): In which structure does ultrafiltration take place? (1) A W B X C Y D Z
- October 2020, Unit 5, Q2(b) (2 marks): Urea is a toxic substance that is excreted from the body. Explain how ultrafiltration removes urea from the blood. (2)
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