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Active immunity is happens due to the contact of lymphocytes with pathoges (or simply their antigens), which triggers the specific immune response and immunological memory is p...
To answer this question, it is first important to understand the meaning of the word degenerate.
So being an A level Biology student, you must know that genes code...
DNA is wrapped around proteins called histones, to form nucleosomes. Each nucleosome is a histone octomer composed of (H2A, H2B, H3, and H4) subunits with a 1.65 helical turn of 147 nucleotide bases. N...
Primary succession starts from bare rock, so no soil is present at the start. Over time the pioneer organisms (such as moss and lichen) break the rock and as the organisms die and deco...
The preparation occurs to the DNA whilst in the nucleus of the cell.
As DNA is a double helix, the two strands of DNA need to be split apart. Therefore the hydrogen bonds...
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