Biomolecules Question 23

23. Genes are packed into a bacterial chromosome by

[1997]

(a) histones

(c) acidic proteins

(b) basic proteins

(d) actin

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Answer : b

Hints & Solutions

(b) In bacteria the chromosome or nucleoid is a naked double stranded DNA. The bacterial DNA is folded with the help of RNAs forming a super coiled circular complex. The coiling is stabilized with the help of non-histonic polyamines and a number of positively charged ions. Eukaryotic DNA is associated with histone proteins that are helpful in its coiling to form chromatin fibres.