In the diagram below, Strands I and II represent complementary sections of DNA. The sequence of Strand I isshown. What is the sequence of Strand II? _______Strand I -----------CTAC-----------Strand II -----------????-------------a. AGCAb. CTACc. TCGTd. GATG5. The instructions for the traits of an organism are determined by: _______a. the proportions of A, T, C, and G in DNA moleculesb. the order of nucleotides in DNA moleculesc. the length of DNA moleculesd. the way nucleotides are paired in the two strands of a DNA molecule6. Watson and Crick first built a triple-helix model of DNA. In this model, the nitrogenous bases were on theoutside of the DNA molecule, and the phosphate groups were on the inside.a. At that time, why did it seem reasonable for the bases to be on the outside of the DNA molecule?
Question
In the diagram below, Strands I and II represent complementary sections of DNA. The sequence of Strand I isshown. What is the sequence of Strand II? _______Strand I -----------CTAC-----------Strand II -----------????-------------a. AGCAb. CTACc. TCGTd. GATG5. The instructions for the traits of an organism are determined by: _______a. the proportions of A, T, C, and G in DNA moleculesb. the order of nucleotides in DNA moleculesc. the length of DNA moleculesd. the way nucleotides are paired in the two strands of a DNA molecule6. Watson and Crick first built a triple-helix model of DNA. In this model, the nitrogenous bases were on theoutside of the DNA molecule, and the phosphate groups were on the inside.a. At that time, why did it seem reasonable for the bases to be on the outside of the DNA molecule?
Solution
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The sequence of Strand II would be GATG. This is because in DNA, the base adenine (A) pairs with thymine (T) and the base cytosine (C) pairs with guanine (G). So, the complement of CTAC would be GATG. Therefore, the correct answer is d. GATG.
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The instructions for the traits of an organism are determined by the order of nucleotides in DNA molecules. This is because the sequence of nucleotides in DNA forms the genetic code, which determines the traits of an organism. Therefore, the correct answer is b. the order of nucleotides in DNA molecules.
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Watson and Crick initially thought it was reasonable for the bases to be on the outside of the DNA molecule because they were following the prevailing scientific thought at the time. However, they later realized that this model did not fit with the experimental data, which showed that the bases must be on the inside of the DNA helix. This led them to propose the correct double helix model of DNA, with the bases on the inside and the phosphate groups on the outside.
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