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Explain the role of Calcium in muscle contraction

Action potential that travels down the motor neuron and reaches neuron terminal causes release of Calcium form sarcoplasmic reticulum. This released calcium will reveal binding sites on actin, hence exposing...
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Answered by Stasa T. • Biology tutor
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Cells go through a repeating cycle of events in growth regions such as plant root tips and animal embryos. Outline this cell cycle.

This cycle can be split into two big parts: the interphase and the dividing phase. The interphase consists of the G1, S and G2 phase. In the G phases the cell increases in size to prepare for the division an...
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Answered by Vasiliki K. • Biology tutor
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What are the differences between normal cells and cancer cells?

Cancer cells are not foreign cells, but abnormally functioning body cells, and may therefore escape immune detection, which is one of the reasons why they are so difficult to treat. Here are some differences...
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Answered by Mariana N. • Biology tutor
4527 Views

Give 3 differences between DNA and RNA

RNA is single stranded whereas DNA is double stranded RNA has uracil whereas DNA has thymine RNA contain the pentose sugar ribose whereas DNA has deoxyribose
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Answered by Oliver H. • Biology tutor
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How does vaccination work?

Vaccines contain weakened (or attenuated) antigens which cause immunity to a disease without actually giving the person the disease. They are usually adminstered by injection or sometimes orally (by mouth), ...
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Answered by Lizzy G. • Biology tutor
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