Question Details

The DNA present in chloroplast is:

Options

A

Linear, double stranded

B

Circular, double stranded

C

Linear, single stranded

D

Circular, single stranded

Show Answer

Correct Answer :

Option B

Circular, double stranded

Circular, double stranded

Solution :

The correct option is Circular, double stranded.

Step-by-step explanation:

1. Nature of Chloroplast DNA (cpDNA): Chloroplasts are semi-autonomous organelles found in plant and algal cells. They possess their own genetic material, which is independent of the nuclear DNA. According to the endosymbiotic theory, chloroplasts evolved from ancestral photosynthetic prokaryotes (cyanobacteria) that were engulfed by eukaryotic cells. Consequently, chloroplast DNA shares characteristics with bacterial genomes.

2. Structure: Chloroplast DNA typically consists of double-stranded DNA (dsDNA) molecules. Unlike eukaryotic nuclear chromosomes which are linear and associated with histone proteins, cpDNA is circular and naked (lacking histones), much like prokaryotic DNA.

3. Conclusion: Therefore, the DNA present in the chloroplast is circular and double-stranded.

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