DNA replication is described as semi conservative because each daughter molecule
Correct answer: A. contains one old strand and one newly synthesised strand
- A. contains one old strand and one newly synthesised strand
- B. is built entirely from new nucleotides
- C. conserves only half of its original bases
- D. is rebuilt only in every second cell cycle
Explanation
When the two parental strands separate, each serves as a template for a new partner, so both daughter helices retain one original strand. This was proved by Meselson and Stahl using nitrogen isotopes, ruling out models in which old DNA was chopped up or fully conserved.
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About Classification of Biological Molecules
Biological molecules are classified as carbohydrates, lipids, proteins and nucleic acids, with water, minerals and vitamins also supporting cellular processes. The key distinctions involve their monomers, chemical bonds, structures and functions, including glucose and starch, fatty acids and triglycerides, amino acids and polypeptides, and nucleotides in DNA and RNA.
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