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Biology

A Level

What are the key principles of evolution?

Variation: there is variation in the physical and behavioural characteristics of a set of organisms. This variation is caused by a combination of genetic and environmental factors.

Answered by Ivan S. • Biology tutor

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Explain the sliding filament theory

The sliding filament theory describes the process by which muscles contract.

Muscle fibres are made up of myofibrils. M...

Answered by Michaela S. • Biology tutor

47023 Views

How are Genes and DNA organised?

DNA

DNA stands for deoxyribose nucleic acid. It is a stable, double stranded helix structured molecule which encodes all of our genetic information. It consists of...

Answered by Emma S. • Biology tutor

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How does DNA code for proteins?

What is DNA? DNA is the chemical used to store genetic information (inherited traits and characteristics) in the body. The shape of DNA is a double helix (two complementary chains, interwoven). Every...

Answered by Patrick G. • Biology tutor

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What is the difference between type I and type II diabetes?

The most important thing to remember is that type I diabetes is genetic and type II diabetes is mostly influenced by environmental factors (although there is thought to be some genetic influence). Pati...

Answered by Daisy Y. • Biology tutor

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