Biology - Chromosomes and Coding Instructions
Chromosomes and Coding Instructions
How well do you know the structure of a chromosome?
Chromosomes  only become visible through a microscope just prior to
cell division. Before they are able to be seen, the DNA  has been
duplicated (replicated) and coils tightly around proteins called histones.
The two strands of DNA so formed are called chromatids  and are still
joined by a protein disk at a point called the centromere.
Chromosomes are distinguished by their length, shape, position of
centromere and banding. An easy way to determine the number of chromosomes
in a cell is to count the number of centromeres. The number of centromeres
will equal the number of chromosomes.
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