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Describe the structure of a standard eukaryotic animal cell

The cell has an outer membrane known as the cell membrane, which envelops the cytoplasm. The cell also contains mitochondria which work to provide the cell with energy (in the form of ATP) and a nucleus, ...

Answered by Safia A. • Biology tutor

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Highlight 3 differences between mRNA and DNA molecules

mRNA is only single stranded, whereas DNA is a double stranded molecule 2. mRNA has Uracil instead of thymine which is found in DNA 3. mRNA contains no introns as they have been spliced out, however...

Answered by Safia A. • Biology tutor

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What is a synapse and how is information transmitted across it?

Synapse = the junction between two neurones (nerve cells) OR the junction between a neuron and an effector cell such as a muscle cell

A synapse between two neurones consists of:

Answered by Emma Louisa S. • Biology tutor

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What are the differences between the structure and function of arteries and veins?

Arteries are blood vessels that carry blood away from the heart. They have thicker walls than veins in order to cope with far higher blood pressure level...

Answered by William H. • Biology tutor

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