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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 att...
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...
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...
(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 for...
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.
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