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List the ways in which arteries and veins differ

Arteries don't have valves, unlike veins. 2. Arteries have more elastic walls in comparison to veins. 3. Arteries have less collagen than veins. 4. Arteries have a narrower lumen in comparison to veins. 5. A...
Answered by • Biology tutor
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What are the seven necessary functions of a living organism?

can be summarised with acronym MRS GRENmovement, respiration, sensitivity, growth, reproduction, excretion and nutrition.
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Answered by Amina A. • Biology tutor
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If DNA inside a cell is damaged, a protein called p53 halts the cell cycle. With this in mind, explain how a p53 gene mutation could cause cancer to develop.

Cancer cells have damaged or mutated DNA. If p53 was functioning, it would stop the cell cycle and ensure damaged cells did not multiply. However, if the gene coding for p53 is faulty, cell division would no...
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Answered by Isabelle M. • Biology tutor
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Describe the structures of DNA and RNA.

DNA (deoxyribose nucleic acid) is made of up two strands of nucleotides that are twisted together to make a double helix (twisted structure). Each nucleotide consists of nitrogenous bases and a backbone of d...
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Answered by Amir F. • Biology tutor
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Describe the process of spermatogenesis leading to the production of four sperm cells in a human male.

the Process occurs in the seminiferous tubules and is supported by sertoli cells which provide the nutrients and energy for the division.Spermatogonia grow and enlarge until big enough to divide, once they a...
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Answered by Melanie B. • Biology tutor
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