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What is osmosis? (GCSE question)

Osmosis is the movement of water from an area of high concentration to an area of low concentration across a semi-permeable membrane. A semi-permeable membrane acts like a barrier that allows only small mole...
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Answered by Arabella T. • Biology tutor
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Describe how the origin of living systems is explained by natural processes. Please provide supporting evidence for hypotheses.. Sp

Numerous experimental investigations have been conducted to explain the diversity and unity of life. Specifically, these models have aimed to provide evidence that the conditions of early Earth provided an e...
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Answered by Ruth S. • Biology tutor
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What is transcription?

Transcription is the process of sections of DNA being converted into mRNA (messenger RNA) that occurs in the nucleus of a cell. DNA is made up of a template strand and a coding strand which are complementary...
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Answered by Carolina M. • Biology tutor
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Sandeep has been fasting and is not drinking water during the daytime. Name the hormone and explain the sequence of events involving this hormone, that occur during the day to maintain Sandeep's water balance.

ADH (Anti-diuretic hormone). First his blood plasma becomes more concentrated. This is detected by receptors in the hypothalamus which stimulates the pituitary gland to secrete ADH. ADH enters the blood stre...
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Answered by Nathan B. • Biology tutor
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What are the adaptations of alveoli to increase gas exchange?

Alveoli are folded to increase their surface area to volume ratio, so more volume of air can diffuse in from the blood and and in from the bronchioles. The lining of the alveoli walls are also moist so the g...
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Answered by Lathesha B. • Biology tutor
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