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Describe the structure of DNA

DNA is the molecule within cells that contains genetic information, in the form of a sequence of bases that form a code that makes up a protein. DNA is a polymer, meaning that it is a macromolecule (large mo...
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Answered by Emma H. • Biology tutor
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If a car is travelling over a curved hill, what is the maximum speed it can travel before losing contact with the road surface?

This is a question about circular motion that also includes some knowledge of Newton's laws. The car is travelling over a curved surface, which you can imagine as part of the circumference of a circle. In or...
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Answered by Emma H. • Physics tutor
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What is the maximum height a pole vaulter could reach?

Whilst at first this question looks difficult, once broken down it becomes quite easy. It is a simple case of energy exchange. The pole vaulter gives themselve kinetic energy as they aproach the bar, and tur...
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Answered by Tim B. • Physics tutor
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Why was internment introduced in Northern Ireland in 1971? And what were the consequences?

In 1969, the nationalist IRA had split in two, and a separate paramilitary group was formed. They fought against the unionists and campaigned to remove Northern Ireland from the UK. There was increasing viol...
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Answered by Maddy W. • History tutor
13419 Views

how is urine produced in the kidney?

The first step of urine formation is ultrafiltration. Blood passes through a network of capillaries in the kidney called the glomerulus. It is filtered into the Bowman’s capsule (the first part of the nephro...
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Answered by Lois C. • Biology tutor
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