Question
True about mitochondrial DNA-
A. UGA codes for tryptophan
B. Codes for 13 protein
C. Circular double stranded DNA
D. All
Show Answer
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Correct Answer » D
Explanation
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Major Features of Human Mitochondrial DNA
– It is circular double-stranded, composed of heavy and light strands.
– It encodes 13 protein subunits of the respiratory chain-
- Seven sub-units of NADH dehydrogenase
- Cytochrome b of complex III
- 3 subunits of cytochrome oxidase
- 2 subunits of ATP synthase
– Encodes tRNA molecules and Ribosomal RNAs
– Genetic code is slightly different from the standard code-
- UGA(stop codon) is read as Trp.
- AGA and AGG (code for arginine) is read as the stop codon
– High mutation rate
