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How does DNA replication take place?

Imagine DNA to be two strings that are twisted together. In order to separate them, particular enzymes should be used. Firstly, helicase unwinds and unzips the helix at place called replication fork. Moreove...
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Answered by Marek W. • Biology tutor
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Explain how the cardiac cycle pumps blood around the body

The heart is made up of four chambers; the left atria, left ventricle, right atria and the right ventricle. The cardiac cycle is made up of repeating phases of systole (contraction) and diastole (relaxation)...
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Answered by Katie A. • Biology tutor
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Explain the process on mitosis

Mitosis is the process of cell division - in which one cell divides to form two cells that are identical to it and then also to each other. These new cells that are formed are called sister cells. The proces...
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Answered by Mahreen B. • Biology tutor
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What is the difference between animal (eukaryotic) and bacteria (prokaryotic) cells?

The main difference between the following two is that bacterial cells do not possess a nucleus or any membrane-bound organelles. In addition to that, bacterial cell walls are made out of murein, plasmids are...
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Answered by Rytis B. • Biology tutor
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What is homeostasis and why is it important? Give an example of a body condition that must be controlled and how.

In order to remember the definition of homeostasis it is useful to memorise the mnemonic ‘MACIE’; the Maintenance of A Constant Internal Environment. Conditions in the body must be constantly controlled beca...
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Answered by Tierney A. • Biology tutor
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