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Describe the process of semi-conservative replication.

DNA is a double-stranded molecule with a base unit on each side held together by hydrogen bonds. A binds to T and C binds to G. DNA polymerase facilitates the localised breaking of these hydrogen bonds. Free...
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Answered by Nick S. • Biology tutor
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What is the difference between DNA and RNA?

While they are both nucleic acids, there are going to be a lot of differences between DNA and RNA, starting from the names (deoxyibonucleic acid and ribonucleic acid). In terms of structure, DNA is double st...
AB
Answered by Ana-Maria B. • Biology tutor
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In a population of 1000 lemmings there are two alleles for skin colour, the dominant colour being cream (C) and the recessive being white (c). 350 individuals have white skin. Use Hardy-Weinberg to predict the number of homozygous recessive individuals.

Hardy-Weinberg Principle states that in a population of randomly mating individuals: p + q = 1 p 2 +2pq+q 2 =1 White fur = homozygous recessive = q 2 = 350/100 = 0.35 Therefore q = sqrt(0.35)=0.59 (2sf)p = 1...
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Answered by Igbunu O. • Biology tutor
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Describe the process of mitosis

Mitosis occurs when a eukaryotic cell has exited interphaseIt occurs in 4 stages: Prophase: The spindle fibres appear in the cell, the chromosomes condense and the nuclear membrane of the nucleus disappearsM...
AM
Answered by Aoife M. • Biology tutor
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A myelinated axon conducts impulses faster than a non-myelinated axon. Explain this difference:

A myelinated neurone is insulated by a layer of Schwann cells that make up the myelin sheath. This aids in the faster conduction of an action potential down the neuronal axon. Depolarisation of the axon can ...
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Answered by Hanna P. • Biology tutor
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