38- Peptide bond formation is catalyzed by the enzymatic activity of an protein

Question

38- Peptide bond formation is catalyzed by the enzymatic activity of an protein molecule. 39- There is one general Aminoacyl tRNA synthetases for all amino acid 40- Which of the following occurs in the E site of the ribosome during translation? ?.true B.false A. True B. False A. An incoming charged tRNA binds to this site. B. The tRNA carrying the growing polypeptide moves to this C. An uncharged tRNA is ejected from this site as the ribosome slides to the next codon D. None of the other answer options is correct 41- Amino acid sequences of a protein evolve through: A. mutation. D. mutation and selection. B. selection. Cadaptation E. selection and adaptation. 42- Which of the following would be expected to decrease the fluidity of a membrane? A. an increase in phospholipid fatty acid chain length and an increase in chain saturation B. a decrease in phospholipid fatty acid chain length and an increase in chain saturation C. a decrease in phospholipid fatty acid chain length and a decrease in chain saturation D. an increase in phospholipid fatty acid chain length and a decrease in chain saturation 43- RNA molecules are transported from the nucleus to the cytoplasm in eukaryotes through: A. sodium-potassium pumps. B. aquaporins. D. budding off of the nuclear envelope. C. passive diffusion. E. nuclear pores 44- How many membranes make up a chloroplast? A. 1 B. 2 C. 3 D. 5 45. Which of the following is a common function of membrane proteins? Select all that apply. B. attachment C. transport A catalysis F all of the above

Explanation / Answer

38. False. It is catalyzed by ribosomes.

39. False. 20 different aatRNA synthetase are there for 20 different amino acids.

40. E site is the site where an uncharged tRNA is ejected from this site as the ribosome slides to the next codon.

41. Amino acid sequence of a protein is evolved through mutation.

42. Decrease in phospholipid fatty acid chain length and decrease in chain saturation increases membrane fluidity.

43. Nuclear pores are responsible for the transport of RNA molecules from nucleus to the cytoplasm in eukaryotes.

44. Chloroplast has 2 membranes.

45. All of the above is correct here as the function of membrane proteins.

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