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How is DNA packaged within Eukaryotic Cell nucleosomes

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. Nucleos...
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Answered by Rosewan A. • Biology tutor
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How does a vaccine prevent infection?

When vaccine is given small amounts of the dead or inactive pathogen are inserted in to the blood, this activates the body's white blood cells which then produce antibodies. These antibodies destroy the dead...
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Answered by Rosie B. • Biology tutor
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What is the difference between primary and secondary succession?

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 decompose, the soil builds...
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Answered by Sarah P. • Biology tutor
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How is the DNA prepared for it to be replicated?

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 need to be broken. The DNA helicase ...
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Answered by Sarah P. • Biology tutor
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What is the difference between aerobic respiration and anaerobic respiration?

Respiration is the process by which the body creates energy by breaking down nutrients. This can either happen in the presence of oxygen, or without it. The key difference between the two processes are that ...
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Answered by Alex W. • Biology tutor
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