LABORATORY REVIEW
MOLECULAR BIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The double helix shows that one strand of the DNA ladder is inherited from each parent.
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The sugars and phosphates that make up the sides of teh DNA ladder twist and curve to conserve space in the cell.
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The double helix is a random occcurance and DNA could just as easily be a straight single-stranded molecule
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The pattern of complementary bases on each side of the DNA ladder ensures that exact copies of the DNA are made during replication.
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Detailed explanation-1: -James Watson and Francis Crick built a model showing that the structure of DNA is like a twisted ladder called a double helix. What purpose does the double helix structure serve? The double helix shows that one strand of the DNA ladder is inherited from each parent.
Detailed explanation-2: -According to Watson and Crick, in preparation for DNA replication, the two strands of DNA first unwound and separated. Next, each DNA strand functioned as a template for a new DNA strand, with the bases on each parent strand dictating new bases on the new daughter strands.
Detailed explanation-3: -In “A Structure of Deoxyribose Nucleic Acid, ” Watson and Crick described DNA as a double helix that contained two long, helical strands wound together. In their model, each DNA strand contained individual units called bases, and the bases along one DNA strand matched the bases along the other DNA strand.
Detailed explanation-4: -Watson and Crick’s model easily explains the mechanism of appearance of mutations in DNA either by substitution of nitrogenous pairs or by their addition or deletion in the polynucleotide chain.