Excretion as an Example of Homeostatic Control (OCR A-Level Biology A): Quizzes
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Practise the questions
10 questions from this quiz
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Practise the questions
10 questions from this quiz
How many main categories of excretory waste are produced by mammalian metabolism?
How many main categories of excretory waste are produced by mammalian metabolism?
Five
Which metabolic waste forms crystals in joints, causing gout?
Which metabolic waste forms crystals in joints, causing gout?
Uric acid
Which vessel carries nutrient-rich blood from the digestive system to the liver?
Which vessel carries nutrient-rich blood from the digestive system to the liver?
Hepatic portal vein
What key structural feature of sinusoids maximizes substance exchange with hepatocytes?
What key structural feature of sinusoids maximizes substance exchange with hepatocytes?
Incomplete endothelial lining
What two products are formed when amino acids undergo deamination?
What two products are formed when amino acids undergo deamination?
Ammonia and organic acid
Which ornithine cycle intermediate contains three nitrogen atoms?
Which ornithine cycle intermediate contains three nitrogen atoms?
Citrulline
How many amino groups are needed to produce one molecule of urea in the ornithine cycle?
How many amino groups are needed to produce one molecule of urea in the ornithine cycle?
Two
In the Cori cycle, what compound is lactate first oxidized to in the liver?
In the Cori cycle, what compound is lactate first oxidized to in the liver?
Pyruvate
Which enzyme oxidizes ethanol to ethanal in hepatocytes?
Which enzyme oxidizes ethanol to ethanal in hepatocytes?
Alcohol dehydrogenase (ALD)
Why does fatty liver occur during alcohol metabolism?
Why does fatty liver occur during alcohol metabolism?
ATP from ethanol reduces fat use