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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. Inheritance: there is a me...
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Answered by Ivan S. • Biology tutor
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Explain the sliding filament theory

Explain the sliding filament theory The sliding filament theory describes the process by which muscles contract. Muscle fibres are made up of myofibrils. Myofibrils comprise of sarcomeres, containing actin a...
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Answered by Michaela S. • Biology tutor
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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 a sugar-phosphate backbone, held together b...
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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 chain h...
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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). Patients w...
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Answered by Daisy Y. • Biology tutor
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