The reaction between the phosphate group of one nucleotide and hydroxyl group of another is a synthesis in DNA molecule.
Correct answer: A. Dehydration
- A. Dehydration
- B. Oxidation
- C. Rehydration
- D. Reduction
Explanation
Explanation:This is a dehydration reaction involving the formation of phosphodiester bonds.This option is incorrect. Oxidation is a chemical reaction that involves the loss of electrons by a molecule, atom, or ion.This option is also incorrect. Rehydration is the process of adding water to a substance to restore its moisture content.This option is also incorrect because reduction is a chemical reaction that involves the gain of electrons by a molecule, atom, or ion.
This question appeared on the UHS MDCAT 2009 paper, which you can sit online with every answer explained.
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About Structure of DNA
DNA structure includes nucleotides made of deoxyribose, phosphate and nitrogenous bases, arranged in two antiparallel polynucleotide strands. Questions cover the double helix, phosphodiester and hydrogen bonds, complementary base pairing between adenine and thymine and between guanine and cytosine, and the significance of major and minor grooves.
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