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coiled thread-like structures of DNA and histone, which is a protein, in the cell nucleus. They are only visible as separate structures during the division of the nucleus (karyokinesis) during the cell cycle. Chromosomes are subdivided into genes and contain the 'genetic information' of a cell.
the factor in an investigation that is under the control of the investigator.
the effect of the relative lengths of daylight and darkness on the physiology and behaviour of...
(SO2) a colourless gas that smells of rotten eggs or burnt matches and is produced by...