Question

Which statement about complementary base pairing is not true?
A. It plays a role in DNA replication
B. In DNA, T pairs with A
C. Purines pair with purines, and pyrimidines pair with pyrimidines
D. In DNA, C pairs with G

Answer 1

Hint: A base pair, which consists of two nucleobases joined by hydrogen bonds, is the basic building block of double-stranded nucleic acids. They contribute to the folded shape of both DNA and RNA and serve as the building blocks of the DNA double helix.
Complete step-by-step solution:
Adenine (A), thymine (T), cytosine (C), and guanine (G) are the four nitrogenous bases that can be used in DNA (G).
A can only bond with T, while C can only link with G.
Chargaff's rule or complementary base pairing rule is what this is known as.
Guanine always binds to cytosine and adenine always attaches to thymine in DNA, a process known as complementary base pairing.
Adenine and thymine always share two hydrogen bonds whereas guanine and cytosine share three hydrogen bonds.
Thymine (T) is swapped out in RNA for a different pyrimidine nucleotide called uracil (U).
Base pairings include pyrimidines and purines. A-T and C-G are the most prevalent base pair combinations.
Due to the complementary nature of these nucleotides, hydrogen bonds can be formed between them. The pyrimidine and purine both have three binding sites in the C-G pair (cytosine).
Base pairs in a sequence of nucleic acids can combine to form a double-stranded structure.
As an illustration, consider the sequence C-A-T-G, where each letter represents a different DNA nucleotide. Its complementary sequence is G-T-A-C.
Hence, option C is correct, i.e., Purines pair with purines, and pyrimidines pair with pyrimidines.
Note: When a cell divides, DNA copies itself through a process called replication. Deoxyribonucleic acid, also known as DNA, is a large molecule that houses our distinct genetic code. It contains the directions for generating every protein in our body, much like a recipe book.