Respuesta :
Answer:
- Ideally, the answer is 100% GC content, but this percentage is not observed in any living organism.
- GC content in living organisms can be less than 30% or more than 80%.
- The DNA having greater than 80% GC content is considered to be stable.
Explanation:
- The stability of a double -stranded DNA molecule depends on the number of hydrogen bonds present in between the double helix.
- Hydrogen bonds are formed between the purine (A,G) and pyrimidine (T,C) nitrogenous bases.
- Adenine (A) and Thymine (T) - two hydrogen bonds.
- Guanine (G) and Cytosine (C) - three hydrogen bonds.
- So the DNA double helix having more GC content will have more hydrogen bonds and hence would be more stable.
- The GC content in a DNA molecule is determined by the ratio of the number of GC bonds present in the DNA to the total number of bonds (AT and GC) present.
- DNA with more than 80% GC content is most stable.
