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Biology
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The genetic code is described as being degenerate. What does this mean? and why ?

We say that the genetic code is degenerate because there are several codons, which code for the same amino acid. For example UCA, UCU, UCG and UCC all code for Serine. 

This is due to the fact that...

MD
Answered by Maria D. • Biology tutor
11889 Views

If cells can respire anaerobically, why do humans need oxygen?

Cells can indeed respire - or release energy - without oxygen, using anaerobic respiration. Here, energy is released from glucose to generate a substance called lactic acid. This is a good temporary solut...

SJ
Answered by Samuel J. • Biology tutor
24268 Views

In the food web shown: Heather -> Rabbit -> Fox, only a small percentage of the Sun’s energy captured by the heather is eventually incorporated into the body tissues of the fox. Explain what happens to the rest of the energy captured by the heather.

To get all FIVE marks for this question, there needs to be FIVE clear, balanced and detailed explanations.

- Respiration

CD
Answered by Chaitya D. • Biology tutor
9100 Views

Describe the synaptic transmission of a nerve impulse

-action potential arrives at the axon terminal 

-voltage gated calcium ion channels open (due to the influx of sodium),

-calcium ions diffuse into the synaptic knob

-synaptic vesicles...

PB
Answered by Phoebe B. • Biology tutor
2516 Views

Describe the consequences of base substitution mutation with regards to sickle cell anaemia

In every gene, a sequence of three nucleotide bases will code for an amino acids, many of which form a protein. Within the normal gene for haemoglobin, the sequence of bases will code to produce amino aci...

CR
Answered by Charlotte R. • Biology tutor
18524 Views

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