CH369 exam4s04 - CH 369 Exam 4 Multiple Choice Questions -...

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CH 369 Exam 4 Multiple Choice Questions - Spring ‘04 1. Which is the predominant DNA conformation in nature? a. A b. B c. C d. D e. Z 2. A nucleoside differs from a nucleotide in that it lacks a a. base b. sugar c. phosphate d. 2’-hydroxyl e. Two of these answers are correct. 3. The bond formed between the hydroxyl group of two successive sugar residues and phosphoric acid in DNA is called a a. glycosidic bond b. hydroxylphosphate bond c. phosphoanhydride bond d. phosphodiester bond e. phosphodihydride bond 4. Which of the following statements about DNA structure is true? a. DNA consists of a double helix comprised of two strands running in the same direction and polarity. b. Adenine and thymine are held together by three hydrogen bonds while guanine and cytosine have only two hydrogen bonds. c. The paired bases lay in a plane parallel to the helix axis. d. It is possible for adenine to hydrogen bond to cytosine and guanine to hydrogen bond with thymine. e. Negatively charged ions are frequently associated with DNA as a result of electrostatic attraction. 5. In supercoiled Eukaryotic DNA, DNA is wound around basic proteins called ______________. a. chromatins b. DNA gyrases c. histones d. nucleosomes e. packing proteins
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6. Upon heating a sample of DNA, a sharp increase in absorbance of light in the 260-nm wavelength range indicates a. DNA winding correlating to an increase in supercoiling. b. DNA unwinding correlating to relaxation of supercoiling. c. DNA winding correlating to double helix formation. d. DNA unwinding correlating to double helix strand separation. e. formation of triple-helical DNA. 7. Two DNA samples are compared. One is found to have a much lower melting temperature than the other. What can be concluded about this DNA sample? a. The DNA strands in this sample are much longer. b. The DNA sample is much more supercoiled. c. The hydrophobic base-stacking interactions are weaker. d. This DNA sample consists of A-DNA. e. This DNA sample contains less guanine-cytosine base pairs. 8. What is meant by the degeneracy of the genetic code? a. The codes for amino acids in eukaryotes is the same as the codes for amino acids in prokaryotes. b. One codon can code for several different amino acids. c. There are no intervening bases that exist between codons. d. No bases are shared between consecutive codons. e. Almost all amino acids have more than one triplet codon that is assigned to them. 9. Which is the ribosomal binding site on messenger RNA at the start of translation? a. AUG codon b. Shine-Dalgarno sequence c. Pribnow box d. UGA codon e. None of these 10. The P site of the 50S ribosomal subunit is where a. the tRNA attached to the growing peptide chain is bound. b.
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This note was uploaded on 03/30/2010 for the course CH 369 taught by Professor Kbrowning during the Spring '07 term at University of Texas at Austin.

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CH369 exam4s04 - CH 369 Exam 4 Multiple Choice Questions -...

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