N-formyl methionine a. can be found attached to every protein in E. coli. b. can
ID: 100867 • Letter: N
Question
N-formyl methionine a. can be found attached to every protein in E. coli. b. can be found attached to some proteins in E coli. c. is never found on proteins in E. coll. The initial step in the formation of an aminoacyl-tRN A is a. esterification of the tRNA b. activation of the amino acid by reaction with ATP c. activation of the tRNA by reaction with ATP d. interaction of the mRNA with the tRNA The process of amino acid activation a. involves the formation of a peptide bond between the amino acid and tRNA b. takes place by formation of a mixed anhydride of the amino acid and tRNA c. involves the formation of an ester bond between the amino acid and tRNA d. none of these Activation of amino acids a. produces a pyrophosphate byproduct. b. produces an inorganic phosphate. c. produces a cyclic AMP. d. does not involve the release of energy. As in RNA and DNA synthesis, the synthesis of proteins follows the following steps, except: a. Activation of monomers b. Initiation c. Elongation d. Termination e. All of these are involved in all polymer synthesis Which category of RNA carries amino acids for the process of translation? a. mRNA b. rRNA c. snRNA d. tRNAExplanation / Answer
15) b, it is attached to some of the e. Coli proteins.
A is wrong because n formyl methionine is the starting amino acid that is coded by the cell. But when the processing happens first amino acids are removed from the protein.
C is wrong because N-formyl methionine is not removed from all the proteins so it is found in proteins.
16)-b, activation of amino acid with the reaction with ATP.
This reaction produces amioacyl-AMP + PPi
17) - c involves Ester bond between amino acid and the trna. This formation of the ester bond conserves a considerable part of the energy from the activation reaction.
18) a) produces pyrophosphate.
Amino acid + ATP--------> amino acid- AMP + PPi
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