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Transcription is the process of using DNA from the nucleus of a cell as a template to synthesise mRNA (messenger RNA). An enzyme called DNA helicase unwinds and u...
The function of coronary arteries is to carry oxygenated blood to the myocardium (heart muscle).
The oxygen supply to the lungs can be increased during vigorous activity by inhaling more deeply and more rapidly. This will cause a larger volume of air to be taken in per breath, which exposes the capil...
Contain Haemoglobin, the molecule for carrying oxygen through the blood. Bi-concave shape, to give a large surface area for diffusion of oxygen. No nucleus to make more space for haemoglobin for oxygen tr...
Original DNA template; DNA replication requires an existing double stranded DNA to copy. Free DNA nucleotides; free bases (ATCG) that can be added to the new DNA strand. DNA polymerase; the enzyme require...
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