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DNA, DNA; deoxyribonucleicacid, Human somatic (body) cells have 46…
DNA
Components
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Nucleotide is made up of three parts; A ring-shaped sugar (deoxyribose), a phosphate group, and a nitrogen base.
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Replication
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Genetic mutation
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Ex. sickle cell anaemia, albinism, melanoma (skin cancer), and DNA-resistant bacteria.
Causation
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Ex. radiation (UV/X-rays), mercury, cigarette tar.
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Chromatin: DNA exists as this; Long, invisible, tangled fibres.
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Chromosomes: Chromatin thickens and shorten to become this; Happens when the cell is preparing to divide.
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