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Biology
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What factors change the rate of diffusion? (3) and what is the relationship between these factors? (1)

Temperature - The higher the temperature the faster the movement of particles so there is an increased rate of diffusion and conversely lowering the temperature decreases the rate of diffusionConcentratio...

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Answered by Aneisha D. • Biology tutor
2778 Views

What is meant by the term genotype and how does this differ from the phenotype?

The genotype of an organism is the combination of alleles, different copies of a gene at the same locus, (from the mother and father) that give rise to a particular trait whereas the phenotype is the obse...

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Answered by Lucy S. • Biology tutor
2949 Views

How do vaccines prevent certain diseases?

Vaccines introduce a dead, inactive or altered form of a pathogen (a microbe that causes an infectious disease) into the body. These pathogens have antigens,

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Answered by Alice M. • Biology tutor
2407 Views

Describe the structure of proteins (5)

The primary structure of proteins consist of the sequence of amino acids that are joined by peptide bonds. These amino acids are joined together via a condensation reaction. The secondary structure is for...

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Answered by Saiful K. • Biology tutor
19451 Views

What are the differences between directional and stabilising selection? Give an example of each.

In directional (a.k.a. adaptive) selection, one extreme of a population has a selective advantage i.e. is fitter than other individuals of the population. This causes a directional shift towards this extr...

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Answered by Ben S. • Biology tutor
4331 Views

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