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Describe the process of meiosis

The first stage of meiosis is Prophase 1, where the homologous chromosomes pair up and spindle microtubules grow from each pole to the equator around the nucleus. The next stage is Metaphase 1, the nucleus m...
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Answered by Conner S. • Biology tutor
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Describe the mechanism of transport in the phloem, involving active loading at the source and removal at the sink.

The active transport of hydrogen ions out of the companion cells using ATP creates a hydrogen ion gradient.This causes the facilitated diffusion of H + ions back into companion cells. This occurs through a c...
JC
Answered by Jonathan C. • Biology tutor
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Describe the process of the reflex arc.

The reflex arc is activated to create a rapid response in order to maintain safety. It is an innate, automatic response to a dangerous stimulus. It involves 3 neurones. A sensory neurone, a motor neurone and...
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Answered by Ria S. • Biology tutor
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How is DNA structured?

DNA stands for deoxyribonucleic acid. Two polynucleotide (which means nucleotide polymer) strands are twisted together and form what looks like a ladder - the DNA double helix . These two strands run antipar...
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Answered by Sadie H. • Biology tutor
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Explain how ATP is generated from reduced NAD and reduced FAD via the electron transport chain?

Reduced NAD is oxidised at the first carrier of the electron transport chain and reduced FAD oxidised at the second. The free electrons move into the system of carriers within the membrane while the protons ...
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Answered by Lewis G. • Biology tutor
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