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Question
The two polynucleotide chains of DNA are
The two polynucleotide chains of DNA are
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Solution
The correct option is B Antiparallel
The two DNA strands are antiparallel, and have opposite polarity, means that 5’ end of one strand faces 3’ end of other strand and vice versa. This means that 5’ phosphate of one strand faces 3’ hydroxyl group of other strand and that the 5’ phosphate groups of two strands are present in opposite position. DNA replication is semiconservative in which a DNA strand serves as a template for the synthesis of a new strand and produces two new DNA molecules, each with one new strand and one parental strand. Synthesis of lagging DNA strand is discontinuous; DNA strands are continuous. Thus, the correct answer is option B.
The two DNA strands are antiparallel, and have opposite polarity, means that 5’ end of one strand faces 3’ end of other strand and vice versa. This means that 5’ phosphate of one strand faces 3’ hydroxyl group of other strand and that the 5’ phosphate groups of two strands are present in opposite position. DNA replication is semiconservative in which a DNA strand serves as a template for the synthesis of a new strand and produces two new DNA molecules, each with one new strand and one parental strand. Synthesis of lagging DNA strand is discontinuous; DNA strands are continuous. Thus, the correct answer is option B.
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