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Describe the role of DNA polymerase in DNA replication

DNA polymerase is an enzyme that adds complimentary DNA nucleotides to the separate DNA strands during DNA replication. It adds a nucleotide to the 3 prime end of the DNA base pairs. DNA polymerase adds the ...
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Answered by Natalie K. • Biology tutor
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Name 3 features of a prokaryote cell that are not common of a eukaryote cell

no membrane bound organellesflagellumplasmids
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Answered by Jamie S. • Biology tutor
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Describe the structure of a cell wall of a xylem vessesl?

It is made of of a molecule known as cellulose. bundles of cellulose known as microfibrils are held together by hydrogen bonds and are arranged in layers in a cris-crosss/ mesh pattern. The layers are held t...
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Answered by Nikeel C. • Biology tutor
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Explain how different tortoises developed on different islands with regards to evolution & natural selection.

On the island there is competition for lower lying grasses and no competition for higher bushes.Because of natural variation some tortoises have longer necks, which enables them to reach the higher bushes on...
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Answered by William B. • Biology tutor
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Describe how the physical defences of human body prevent the invasion of microooragnisms which cause infections.

Our skin surrounds almost all parts of our body and can act as a mechanical barrier between microorganisms and our body. If the skin is damaged or cut, a scab will be formed to prevent microorganisms from en...
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Answered by Audrey T. • Biology tutor
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