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How many chromatids does a cell contain during Prophase?

92A human has 46 chromosome (23 pairs). After the genetic material is duplicated and condenses in Prophase, there are still 46 chromosomes but they exist in an X-shape, where two sister-chromatids are attach...
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Answered by Ebele A. • Biology tutor
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Describe the role of DNA polymerase in DNA replication.

DNA polymerase is an enzyme that catalyses the synthesis of DNA molecules from free nucleotides. After DNA helicase unwinds the DNA molecule, DNA polymerase reads the existing DNA strands and incorporates co...
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Answered by Tamsin W. • Biology tutor
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Describe how a vaccine leads to production of antibody against the disease (4 marks)

This question is asking for an outline of how antibody is produced in an immune response, and for the 4 marks, we need to identify 4 or more steps using key words in this process. This question could also be...
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Answered by Erin P. • Biology tutor
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Mitosis is the process of cell division, it occurs in humans and in plants. Compare and contrast the process of mitosis in human cells and in plant cells (5 marks)

(1) shape- in animal cells round before division, plant cells maintain shape throughout. (1) centrioles- present in animal cell mitosis, form the spindle fibre AND Absent in plant cells, spindle fibre forms ...
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Answered by Amelia L. • Biology tutor
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Outline the reasons why insects and other animals need well-developed transport systems (3 marks)

This question has 3 marks attached to it, therefore the examiner is looking for three clear points. Larger organisms tend to have higher metabolic demands as they are more active. Furthermore, there are larg...
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Answered by Vaibhav D. • Biology tutor
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