Top answers

Why are drug trials needed?

To determine the side effects of taking the drug on humans, to test for toxicity, to determine the correct dosage needed, and to test the effectiveness (efficacy) of the drug.
DP
Answered by Devna P. • Biology tutor
3975 Views

What is the difference between a recessive and dominant allele?

Alleles are different versions of a gene . Every person has two alleles for each gene (one from either parent). For example, the gene which determines eye colour can either have an allele for brown eyes or a...
EJ
Answered by Elisha J. • Biology tutor
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How could species have evolved from an ancestor such as Archaeopteryx?

When the population of a species is separated, each group is put under different selection pressures due to differing environments. In each population there is genetic variation, and more offspring are produ...
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Answered by Heather J. • Biology tutor
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Explain the process of transcription in Eukaryotes

Transcription is the process by which a DNA sequence is copied into a complementary RNA sequence. RNA polymerase binds to the promoter region of the DNA chain and causes the unwinding and separation of the D...
HJ
Answered by Heather J. • Biology tutor
18990 Views

Explain the process of synaptic transmission

The synapse is the junction between two neurons. When an action potential reaches the synaptic knob of a neuron, voltage-gate calcium channels are opened, causing an influx of positively charged calcium ions...
HJ
Answered by Heather J. • Biology tutor
12400 Views