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Biology

A Level

What is Mitosis?

During mitosis, one cell divides into two daughter cells.

First, the cell grows and doubles the amount of DNA (in human cells from 23 pairs of chromosomes to...

Answered by Simone V. • Biology tutor

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Name the 5 stages of mitosis in order

I remember using this handy mnemonic: "IPMAT".

Interphase

Prophase

Metaphase

Answered by Luke R. • Biology tutor

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What are the differences between DNA and RNA?

There are three main differences between DNA and RNA:

1. RNA has the base uracil instead of the base thymine. These bases are ve...

Answered by Charlotte C. • Biology tutor

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Why are organisms within a species genetically different?

1) Crossing over - in Prophase I of meiosis, non-sister chromatids in the same bivalent (i.e. chromatids on separate chromosomes within a homologous pair) can exchange alleles, creating n...

Answered by Katherine F. • Biology tutor

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Transcription is the formation of an mRNA molecule from its complementary DNA template.
First the enzyme DNA helicase unwinds the double helix, and the hydrogen bonds between complementary bases brea...

Answered by Katherine F. • Biology tutor

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