A mutagecn thar causes the formation of thymine dimers in bacteria DNA: a Acridi

Question

A mutagecn thar causes the formation of thymine dimers in bacteria DNA: a Acridine dye b. Ultra Violet radiation c. X-rays d. Gamma radiation e. All of the above 2. A chemical agent that causes cancer is referred to as: a. Oncogene b. Teratogen e Operon d. Carcinogen e. None of the above The smallest unit of heredity is the a. Chromosome b. Codon 3. d. Nucleotide e. Gene The formation of a new chromosome, different from either parent, by the combination of genetic material from two different genes is called: a. Transcription b. Conjugation 4. c. Translation Recombination e. None of the above Plasmids that have genes for resistance to antibiotics are called factors a. Col B Resistance c. Virulence d. Fertility e. All of the above 5. 6. Which one of the following is a unique limitation of ultra violet radiation? a. Non penetration of surfaces b. Breaks DNA strands c. Produces free radicals d. Can be used to sterilize plastics and pharmaceutical e. Can cause mutation in human cells 7. During conjugation, at the end of a complete F* X F mating, the donor genotype will be_ and the recipient will be

Explanation / Answer

1) Option B is correct. Ultra violet radiations cause the formation of thymine dimers in bacteria DNA. When thymine absorbs UV light, is becomes reactive with an adjacent thymine molecule in the DNA double helix which leads to formation of a cyclobutane dimer in which the two thymine residues are covalently linked. Thus, RNA polymerase is unable to make an accurate RNA and protein.

2) Option D is correct. A chemical agent that causes cancer is referred to as a carcinogen

3) Option E is correct. The smallest unit of heredity is gene

4) Option D is correct. The formation of a new chromosome, different from either parent, by the combintion of genetic material from two different gene is called recombination.

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