Download PDF by Golder Wilson: Biochemistry and Genetics

By Golder Wilson

ISBN-10: 0071389377

ISBN-13: 9780071389372

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Extra resources for Biochemistry and Genetics

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A. b. c. d. e. qxd 11/14/01 10:36 AM Page 19 DNA Structure, Replication, and Repair 19 31. Radiation therapy is employed for many cancers, including irradiation of the central nervous system to destroy lymphoblasts in leukemia. Which of the following accounts for the destruction of rapidly growing cells? a. b. c. d. e. Cross-linking of DNA Demethylation of DNA Cleavage of DNA double strands Disruption of DNA-RNA transcription complexes Disruption of purine rings in DNA 32. Mammalian chromosomes have specialized structures with highly repetitive DNA at their ends (telomeres).

3. The intact ribosome slides forward three bases to read a new codon. 4. The primed small ribosomal subunit binds with the large ribosomal subunit. 5. Elongation factors deliver aminoacyl-tRNA to bind to the A site. a. b. c. d. e. 1, 2, 5, 4, 3 2, 3, 4, 5, 1 4, 5, 1, 2, 3 3, 2, 4, 5, 1 2, 4, 5, 1, 3 55. New proteins destined for secretion are synthesized in the a. b. 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?

B. c. d. e. Plant nuclei Cardiac muscle cytoplasm Pancreatic mitochondria Liver endoplasmic reticulum Neuronal cytoplasm 67. Which of the following statements is true of all transfer (t) RNAs? a. b. c. d. e. The 3′ end is phosphorylated They are duplex chains No methylated bases are found The anticodon loop is identical The 3′ end base sequence is CCA 68. Methionyl–transfer (t) RNA is used for initiation of protein synthesis by which of the following? a. b. c. d. e. Chloroplast ribosomes Eukaryotic mitochondrial ribosomes Eukaryotic cytoplasmic ribosomes Bacterial ribosomes Bacterial cytoplasm 69.

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Biochemistry and Genetics by Golder Wilson

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