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describe how a genetic mutation of the gene coding for lactase can lead to lactose intolerance.

-A genetic mutation within the lactase gene, for example base substitution, changes a codon -This codon codes for a different amino acid to be transcribed and translated-Therefore the sequence of amino acids...
JM
Answered by Jessica M. • Biology tutor
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Describe how information passes across a synapse

A chemical neurotransmitter is released from the end of one neurotransmitter, and diffuses across the synapse to bind to transmitters on the next neurone to stimulate an electrical impulse.
AK
Answered by Annabelle K. • Biology tutor
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What is DNA?

DNA carries the genetic information that codes for instructions in our body and other organisms. DNA is deoxyribonucleic acid. It is found in the shape of a double helix. The conclusion that DNA is in the sh...
VB
Answered by Vicky B. • Biology tutor
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What is the role of calcium in synaptic transmission?

Calcium is found as an ion, Ca2+ in the extracellular space of the pre-synaptic neuron. The ions enter the neuron through voltage -gated channels after the depolarisation of the pre-synaptic neuron. This cau...
WF
Answered by Wiktoria F. • Biology tutor
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Name the 3 structures within a plant cell that are absent from an animal cell and describe the function of these 3 structures. (6 marks)

Plant cells contain chloroplasts (1), a cell wall (1) and a permanent vacuole (1). These structures are absent from animal cells. Chloroplasts contain chlorophyll which absorb light energy for photosynthesis...
HL
Answered by Hannah L. • Biology tutor
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