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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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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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What is an enzyme?

An enzyme is a protein catalyst . A catalyst is a substance which alters the rate of a chemical reaction. (So it can speed up a chemical reaction). The key thing about an enzyme is that it is not itself chan...
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Answered by Lauren D. • Biology tutor
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A walker falls through thin ice into very cold water. What does the body do to stop the core body temperature from falling too quickly?

The walker's body will do three things to help slow the decrease in core body temperature. The first is the walker will begin to shiver. Shivering is the spasming of muscles, the muscles as they work generat...
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Answered by Jack T. • Biology tutor
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Explain Charles Darwin's Theory of Evolution

Populations naturally vary . (Think of how people in your class vary in height, weight and other features) This variation is brought about by inheritance of genetic material from parents. In organisms that r...
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Answered by Lewis C. • Biology tutor
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