THE MOLECULAR BASIS OF INHERITANCE
STRUCTURE OF NUCLEIC ACIDS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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short chain
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long chain
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triple helix
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ring
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Detailed explanation-1: -Mitochondria and chloroplasts have their own DNA that is circular, not linear. Mitochondria and chloroplasts have their own ribosomes that have 30S and 50S subunits, not 40S and 60S. Several more primitive eukaryotic microbes, such as Giardia and Trichomonas have a nuclear membrane but no mitochondria.
Detailed explanation-2: -The DNA molecules found in mitochondria and chloroplasts are small and circular, much like the DNA of a typical bacterium.
Detailed explanation-3: -Ring-shaped electron-translucent regions in the chloroplast contain chloroplast DNA. The DNA is distributed along this ring in an uneven fashion and, when stained, resembles a string of beads. Each plastid has I ring, and the ring is unbroken in the intact plastid.
Detailed explanation-4: -Chloroplast DNAs are circular, and are typically 120, 000–170, 000 base pairs long.
Detailed explanation-5: -Chloroplast DNA (cpDNA) in photosynthetic land plants is also a circular genome, which varies in size from about 120, 000 to 247, 000 nucleotides, largely because of a large inverted repeat that includes genes for the rRNA subunits. Each chloroplast contains from about 22 to 900 cpDNA copies and each encodes 123 genes.