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Describe what is meant by the double circulation system of the heart.

The double circulatory system refers to the heart having two, connected, closed circuits. The first goes from the right ventricle of the heart to the lungs and back to heart via the left atrium. The second p...
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Answered by Ibrahim M. • Biology tutor
9652 Views

Describe the process of semi-conservative replication.

DNA is a double-stranded molecule with a base unit on each side held together by hydrogen bonds. A binds to T and C binds to G. DNA polymerase facilitates the localised breaking of these hydrogen bonds. Free...
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Answered by Nick S. • Biology tutor
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Explain how fractional distillation works.

Hydrocarbons have different boiling points and therefore different condensation points. The linger the hydrocarbon, the more intermolecular forces exerting between each molecule. This means that it requires ...
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Answered by Nick S. • Chemistry tutor
7831 Views

Factorise 4x + 52

4(x+13)
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Answered by Nick S. • Maths tutor
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Explain the collision theory.

In order to react, particles must collide with sufficient energy. Particles with a temperature above 0K are always moving and colliding with each other.
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Answered by Nick S. • Chemistry tutor
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