WORLD OF CELL+MASTERING ACCESS >CUSTOM
9th Edition
ISBN: 9781323445044
Author: Hardin
Publisher: PEARSON C
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Chapter 19, Problem 19.5PS
Bacterial and Eukaryotic Protein Synthesis Compared. For each of the following statements, indicate whether it applies to protein synthesis in bacteria (Ba), in eukaryotes (E), in both (Bo), or in neither (N).
- (a) The mRNA has a ribosome-binding site within its leader region.
- (b) AUG is a start codon.
- (c) The enzyme that catalyzes peptide bond formation is an RNA molecule.
- (d) The mRNA is translated in the 3′ → 5′ direction.
- (e) The C-terminus of the polypeptide is synthesized last.
- (f) Translation is terminated by special tRNA molecules that recognize stop codons.
- (g) A 5’cap structure promotes formation of a translational initiation complex.
- (h) ATP hydrolysis is required to attach an amino acid to a tRNA molecule.
- (i) The specificity required to link the right amino acids to the right tRNA molecules is a property of the enzymes called aminoacyl-tRNA synthetases.
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Protein folding with PDI and Peptidyl-prolyl isomerase
resting state of the protein, the Lys 216 Schiff base has pKa = 9.5 and Asp 85 has pKa = 3.5. When the conformational change occurs, the proton that was on the Schiff base moves to Asp 85. This should tell you that one or both of these two pKas
changed with the conformational change. How does the pKa of Asp 85 compare with the pKa of the Lys 216 Schiff base after the conformational change?
Activity:
Write the line structure of each of the following peptide at pH7 and identify how many peptide bond in each
number.
1 Alanyl-phenylalanine
2. Lysyl-alanine
3.Phenylalanyl-tyrosyl-leucine
Chapter 19 Solutions
WORLD OF CELL+MASTERING ACCESS >CUSTOM
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