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C. d. e. Golgi apparatus Smooth endoplasmic reticulum Free polysomes Nucleus Rough endoplasmic reticulum 56. Which of the following statements regarding eukaryotic cells is true? a. b. c. d. e. Formylated methionyl-tRNA is important for initiation of translation Single mRNAs specify more than one gene product Cycloheximide blocks elongation during translation Cytosolic ribosomes are smaller than those found in prokaryotes Erythromycin inhibits elongation during translation 57. Modification of mRNA so that a signal sequence is added to the amino terminus of the cytosolic protein, α-globin, results in a.

DNA deletions and point mutations are less common than DNA cross-links after sunlight exposure. 17. The answer is e. (Murray, pp 412–434. Scriver, pp 3–45. Sack, pp 3–29. ) The process of transduction involves the transfer of a portion of DNA from one bacterium to the chromosome of another bacterium by means of a viral infection. Conjugation is the transfer of a socalled male chromosomal DNA to the DNA of an acceptor, or female, bacterial cell. Colinearity defines the relationship between genes and proteins in that the sequence of amino acids in proteins is a result of the sequence of base triplets in template genes.

They are found more commonly in viruses than in bacteria They are single-stranded circles They sometimes enhance bacterial susceptibility to antibiotics They sometimes enhance bacterial resistance to antibiotics They are too small to be useful as vectors for the cloning of mammalian DNA segments 28. Which of the following molecules is found in a nucleoside? a. b. c. d. e. A pyrophosphate group A 1′ base linked to a pentose sugar A 5′-phosphate group linked to a pentose sugar A 3′-phosphate group linked to a pentose sugar A terminal triphosphate 29.

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