42. When ultraviolet light strikes DNA, it can cause a specific type of damage. How is this damage best described? A. Thymine bases on the opposing DNA strands are covalently linked together to form a thymine dimer. B. Thymine bases on one strand of DNA, next to each other, are covalently linked together to form a thymine dimer. C. Adenine and thymine bases on opposing DNA strands are linked together by hydrogen bonds. D. Adenine and thymine bases on opposing DNA strands are covalently linked together to form an AT dimer. 43. Transduction requires a(n) ______ to move DNA from one bacterial cell to another. A. bacteriophage B. naked DNA molecule C. F plasmid D. transposase enzyme
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When ultraviolet light strikes DNA, it can cause a specific type of damage. How is this damage best described? The correct answer is A. Thymine bases on the opposing DNA strands are covalently linked together to form a thymine dimer. Ultraviolet light can cause Show more…
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One of the biologically harmful effects of ultraviolet (UV) light is its action on DNA. UV light results in what type of alteration in DNA? covalent formation of purine dimers involving adjacent purines on opposing DNA strands covalent formation of pyrimidine dimers involving adjacent pyrimidines in a DNA strand covalent formation of links between purine and pyrimidine base pairs covalent formation of links between deoxyriboses on opposing DNA strands covalent formation of pyrimidine dimers involving adjacent pyrimidines on opposing DNA strands
Dominador T.
DNA damage can occur as a result of exposure to chemicals or ultraviolet radiation. What happens during nucleotide excision repair of damaged DNA? A. Enzymes delete an incorrect DNA sequence, pull the gap closed, and join the bases on either side of the gap together. B. Enzymes cut out the damaged gene, copy the same gene from the homologous chromosome, and insert the copy. C. Enzymes detect an incorrect DNA base pairing in a DNA strand, remove the incorrect base, and insert the correct base. D. Enzymes open the DNA strand, remove a segment of DNA from the strand that contains the damage, and resynthesize the correct DNA sequence.
Adi S.
Ultraviolet light damages DNA in what way: a. Causes the DNA molecule to break apart b. Results in the loss of methyl groups from the molecule c. Forms dimers which link adjacent thymines or cytosines together, making replication difficult, if not impossible d. Causes the molecule to turn inside out e. None of the above
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