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Biology
A Level

Explain, with a digram, the difference between meiosis and mitosis

Meiosis produces 4 daughter cells from the original parent cell. These cells are haploid cells- they have half the number of chromosomes that the parent cell, and the process creates gametes for sexual re...

Answered by Heather T. Biology tutor
2384 Views

What is crossing-over?

In prophase I of meiosis, homologous, non-sister chromatids form connections called chiasmata at matching loci. The complex then splits to give chromatids with different combinations of genes than were pr...

Answered by Emma S. Biology tutor
2528 Views

Where do all the stages of respiration (aerobic and anaerobic) happen?

The first part of aerobic respiration is to convert glucose into pyruvate in a series of reactions known as glycolysis, which happens in the cytoplasm of cells. Glycolysis consumes 2 molecules of ATP and ...

Answered by Eve L. Biology tutor
2218 Views

Describe the process that allows an action potential to be passed across a synapse in the parasympathetic nervous system.

The action potential arrives at the presynaptic knob and causes the depolarisation of the plasma membrane. This causes voltage gated calcium channels to open allowing calcium to diffuse into the presynapt...

Answered by Rebecca O. Biology tutor
1971 Views

Explain how the structure of mRNA differs from the structure of DNA

The structure of mRNA differs from the structure of DNA in that mRNA is a single-stranded molecule whereas DNA is a double-stranded molecule in the form of a helix. Another difference between them is that...

Answered by Maria Z. Biology tutor
16877 Views

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