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Biology
GCSE

What is a nephron?

Nephrons are units of the kidney which are specially adapted for filtration and reabsorption of substances in the blood. Each nephron is composed of different various parts which have specific roles. T...

LH
Answered by Laetitia H. Biology tutor
6126 Views

Why do bacteria become resistant to antibiotics?

Antiobiotics kill bacteria but bacteria can become resistant to antibiotics. This happens through a process called natural selection. Within a group/population of bacteria they will all have small diff...

LG
Answered by Lysander G. Biology tutor
4324 Views

What is evolution?

Mutations in individuals leads to variation in a population of a species. Some individuals have characteristics that makes them better suited to their environm...

AL
Answered by Ann L. Biology tutor
3904 Views

What is an allele?

Alleles are different forms of a gene. For example, given the gene for eye colour there would be many different colours available. People with brown eyes would have the allele of the eye colour gene co...

JD
Answered by Jessica D. Biology tutor
4436 Views

Humans have reflexes. Describe the route of an impulse through a reflex arc.

First of all, the IMPULSE IS DECTECTED by receptors.SENSORY neurone passes impulse onto RELAY NEURONE in SPINAL CORD.RELAY neurone passes impulse onto MOTOR neuroneMOTOR neurone passes impulse to EFFECTOR...

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Answered by Ozbil D. Biology tutor
14497 Views

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