In the given diagram of DNA, X represents:
Correct answer: A. Sugar-phosphate backbone
- A. Sugar-phosphate backbone
- B. Nitrogenous base
- C. Nucleotides
- D. Hydrogen bonds
Explanation
The sugar-phosphate backbone of DNA is formed by alternating deoxyribose sugar and phosphate groups linked by phosphodiester bonds. This backbone gives structural stability, while base pairs form the rungs of the DNA double helix.
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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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