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What are the differences between eukaryotic and prokaryotic cells?

Eukaryotes, including animal and plant cells, are characterised by their membrane nucleus. They contain organelles such as mitochondria, which are located in the cytoplasm bound by membranes. Eukayotic cells...
JW
Answered by Jess W. • Biology tutor
10604 Views

What causes the resting potential in a neurone?

A neurone which is not conducting a nerve impulse has a negative charge of -70mV compared to the outside environment; there is a potential difference across the membrane. This is partly caused by movement of...
KD
Answered by Katherine D. • Biology tutor
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The following taxons are used in the classification of organisms: Phylum; Family; Order; Class; Species; Kingdom and Genus. Please place them in the correct order from largest to smallest.

Kingdom; Phylum; Class; Order;Family;Genus; Species Here is a handy mnemonic to help you remember (if you like spongebob squarepants!): K rabby P atties C ook O n F ry G rills S pongebob Here is an example o...
SG
Answered by Sophie G. • Biology tutor
9154 Views

How does a vaccine lead to the production of antibodies and why does this provide immunity?

Vaccines are designed so that they contain antigens - for example viral antigens from the virus we wish to protect against. When these are injected they are recognised as foreign by white blood cells called ...
EJ
Answered by Emily J. • Biology tutor
14320 Views

What is crossing over?

Crossing over is a process that happens during meiosis and results in genetic variation in gametes. It happens between prophase and metaphase. Pairs of homologous chromosomes lined up next to each other touc...
EB
Answered by Erin B. • Biology tutor
33736 Views