30. T c. Nuclear 31. Which of the following statements is true and provides evid

Question

30. T c. Nuclear 31. Which of the following statements is true and provides evidence that a certain component of the ribosome catalyzes protein synthesis? are inactive after protease digestion. b. Ribosomes are inactive after RNase digestion. c. Structural analysis shows that proteins occupy the catalytic site where peptide bonds are formed. d. Structural analysis shows that mRNA occupies the catalytic site where peptide bonds are formed. 32. Eukaryotic ribosomes recognize and initially bind to what structure on the mRNA? b. The 7 c. A TATA sequence d. A CCAAT sequence to the 33. The first step in the initiation of protein synthesis is the binding of a. initiation factors; initiation codon b. initiation factors; small ribosomal subunit c. the small ribosomal subunit; initiation codon d. the initiator tRNA; initiation codon 34. Termination of translation and release of the polypeptide chain occurs when a. tRNA binds to a termination codon via a complementary an b. a protein release factor binds to the termination codon. c. a tRNA with a complementary anticodon binds to a termination codon, and a release factor bound to the CCA end releases the chain. d. a small molecule shaped like puromycin binds to the termination codon. ticodon but lacks an amino acid. 35. The amount of a protein in a cell is regulated by the rate of a. transcription of its b. translation of its m c. degradation of the protein. d. All of the above RNA. 36. siRNAs act primarily to inhibit a. transcription, by binding to specific genes. b. tra by formation of heterochromatin. d. translation, by binding to an mRNA. 37. The correctly folded three-dimensional configuration of a protein is determined primarily by the a. sequence of nucleotides of its gene. b. primary sequence of its amino acids. C-chaperones with which it interacts. d. pathway by which it folds 38. Proteins that facilitate the folding of other proteins are called b. binding proteins. c. chaperones. d escorts ©2046 Sinauer Associates, Inc.

Explanation / Answer

30. A. Ribosomes

31. B. Ribosomes are inactive after RNase digestion

32. B. 7 methylguanosine cap

33. B. Initiation factors, small ribosomal subunit

34. B. Protein release factor binds to termination codon

35. D. All

36. D. Translation, binding to mRNA

37. B. Sequence of amino acids

38. C. Chaperones

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