Each helix of DNA is made up of four types of nucleotides and both helices are complementary to each other i.e. if one helix contains Adenine the opposite helix will contain:
Correct answer: D. Thymine
- A. Histidine
- B. Uracil
- C. Cytosine
- D. Thymine
Explanation
According to Chargaff's base pairing rule:Adenine (A) always pairs with Thymine (T) → by two hydrogen bondsCytosine (C) always pairs with Guanine (G) → by three hydrogen bondsSo,➡ If one helix (strand) contains Adenine,➡ The opposite helix (complementary strand) will contain Thymine.
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About Chromosomes
Chromosomes are DNA-protein structures that carry genes and become visible during cell division. Coverage includes chromatin, centromeres, sister chromatids, homologous chromosomes, chromosome number, and the distinction between diploid and haploid cells, with links to DNA replication, mitosis and meiosis.
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