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Biology

GCSE

Explain how transcription of genes occurs

Transcription occurs in the nucleus of the cell.The enzyme DNA helicase catalyses the 'unzipping' or splitting of the two DNA chains in the region of the gene by catalysing the breaking of the hydrogen bo...

Answered by Vanessa T. • Biology tutor

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Explain and define the roles of producers, primary, secondary and tertiary consumers, and decomposers

Every organism has a tropic relationship in a food chain. Producers are at the bottom of the food chain and they are autotrophs, meaning they get their nutrition through sunlight via photosynthesis, for e...

Answered by Jessica B. • Biology tutor

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Explain the role of anti-diuretic hormone in the production of concentrated urine

when the water potential of the blood is too low (1) * This is detected by receptors in the hypothalamus (2)* the pituitary gland in the brain then secretes more ADH (3) * ADH increases the permeabi...

Answered by Sara B. • Biology tutor

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Compare anaerobic respiration in a yeast cell with aerobic respiration in a muscle cell (3 marks)

yeast cells produce ethanol whereas muscle cells produce lactic acid as a by-product yeast cells produce CO2, muscle cells do not they both produce small amounts of energy

Answered by Cat F. • Biology tutor

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How does the hormone ADH help the kidneys regulate the water content of blood?

ADH is produced by the pituitary gland located in the brain. When the water content of blood is low, more ADH is released from the pituitary gland into the blood. When it reaches the kidneys, it causes th...

Answered by Gabriella Z. • Biology tutor

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