Search our library of Biology questions

Top answers

Biology

All levels

What is diffusion and why is it important in both animals and plants?

Diffusion is a passive process involving the movement of molecules from a region of a higher concentration to one of a lower concentration (the term passive means that the process does...

Answered by Mathew C. • Biology tutor

179214 Views

Where is DNA found in a human cell? What is a gene?

DNA is a long molecule found in the nucleus (or more specifically the nucleolus) of a human cell. When it is condensed and shortened it appears, under a microscope,

Answered by Ryan M. • Biology tutor

17510 Views

Describe the passive movement through diffusion and explain Fick's Law

Diffusion is the net passive movement of particles (atoms, ions or molecules) from a region in which they are in higher concentration to regions of lower concentration. It continues un...

Answered by Zuzana B. • Biology tutor

44935 Views

How do muscle fibres contract?

Contraction occurs when an impulse from a motor neurone reaches the synapse at the junction with the muscle, the neuromuscular junction (NMJ).

At the pre...

Answered by Emily B. • Biology tutor

4045 Views

Describe the different roles of aldosterone and cortisol in the body

Both aldosterone and cortisol are produced in the adrenal cortex of the adrenal gland (which are situated above the kidneys on either side of the body).

Aldosterone is a mineralocorticoi...

Answered by Aiman J. • Biology tutor

10724 Views