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Describe how low blood water levels are controlled in the human body. (5 marks)

Changes in blood water levels are detected by the hypothalamus through the negative feedback mechanism in homeostasis (2 marks). The pituitary gland releases anti-diuretic hormone into the bloodstream as a r...
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Answered by Rehan J. • Biology tutor
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Genetic engineering can be used to modify the genome of an organism to express desirable characteristics. Outline the steps of producing a recombinant DNA molecule.

The steps are as follows:The desired gene is isolated by 'cutting' it out using a restriction enzyme. The same restriction enzyme is then used to 'cut' a vector (plasmid or virus). These can either be left a...
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Answered by Marium Z. • Biology tutor
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How do I write a compelling descriptive essay question for English Language paper 1

Often students find the narrative choice in the 40 Mark question to be preferable. However it is possible that the exam will feature a choice between 2 descriptive questions, (therefore omitting a narrative ...
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Answered by Samuel W. • English tutor
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Describe simple harmonic motion (SHM). Sketch a displacement-time graph for a particle undergoing SHM and the corresponding velocity-time and acceleration-time graphs. Use these graphs to describe the relationship between accleration and displacment.

Simple harmonic motion is periodic motion in which a restoring force acts in the opposite direction to that of displacement and is directly proportional to the displacement.The displacement-time graph for SH...
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Answered by David G. • Physics tutor
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How do I know which adjectives are placed before or after a noun?

An adjective is a word that describes a noun, such as sweet, yellow and delicious . In French, adjectives agree in number and gender with the noun or pronoun they qualify.Unlike in English, where most adject...
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Answered by Rosanna L. • French tutor
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