Q805
A tautomeric shift in adenine (amino to imino) allows it to pair with . . . . . . . . only.
A.
Cytosine
AnswerB.
Uracil
C.
Guanine
D.
Thymine
Answer: Option A
Solution
Answer: Option A
Solution:
A tautomeric shift in adenine (amino to imino) allows it to pair with Cytosine only.The spontaneous isomerization of a nitrogen base to an alternative hydrogen-bonding form, possibly results in a mutation.
Reversible shifts of proton position in a molecule. Bases in nucleic acids shift between keto and enol forms or between amino and imino forms.