Looking for classes? Ksquare Career Institute, Bengaluru →
In DNA, the complementary bases are -
A
adenine and guanine, thymine and cytosine
B
uracil and adenine, cytosine and guanine
C
adenine and thymine, guanine and cytosine
D
adenine and thymine, guanine and uracil
Detailed Solution
DNA contains two types of nitrogenous bases.
Purines: Adenine (A) and Guanine (G).
Pyrimidines: Cytosine (C) and Thymine (T).
In the double helix a purine always pairs with a specific pyrimidine on the opposite strand.
Adenine pairs with thymine (A : T) by two hydrogen bonds.
Guanine pairs with cytosine (G : C) by three hydrogen bonds.
Uracil is present in RNA in place of thymine; it is not a base of DNA.
So the complementary bases in DNA are adenine and thymine, guanine and cytosine.
Purines: Adenine (A) and Guanine (G).
Pyrimidines: Cytosine (C) and Thymine (T).
In the double helix a purine always pairs with a specific pyrimidine on the opposite strand.
Adenine pairs with thymine (A : T) by two hydrogen bonds.
Guanine pairs with cytosine (G : C) by three hydrogen bonds.
Uracil is present in RNA in place of thymine; it is not a base of DNA.
So the complementary bases in DNA are adenine and thymine, guanine and cytosine.