AQA · Biology · 8461
GCSE Biology: Metabolism
Bioenergetics · AQA GCSE Biology (8461), specification point 4.4.2.3. Cards are generated from the exam board's own specification for "Metabolism", and every card links back to the page it came from. Specification © AQA — used with attribution.
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Define metabolism.
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The sum of all the reactions in a cell or the body.
Which process transfers the energy used for the enzyme-controlled reactions of metabolism?
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Respiration in cells.
Name the three polymers that glucose is converted into during metabolism.
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Starch, glycogen and cellulose.
What is a lipid molecule made from?
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One molecule of glycerol and three molecules of fatty acids.
Which two substances are used to form amino acids?
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Glucose and nitrate ions.
Amino acids are joined together to synthesise ?.
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proteins
What waste product is formed when excess proteins are broken down?
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Urea, which is then excreted.
In a homeostatic control system, what is the role of receptors?
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They sense (detect) changes in the internal or external environment.
In a homeostatic control system, what is the role of effectors?
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They bring about the changes (responses) that restore conditions.
Which coordination system brings about faster responses: nervous or hormonal?
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The nervous system; hormonal responses are usually much slower.
Hormonal coordination controls the ? cycle in reproduction.
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menstrual
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