Biochemistry: The Molecular Basis of Life
6th Edition
ISBN: 9780190209896
Author: Trudy McKee, James R. McKee
Publisher: Oxford University Press
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Chapter 19, Problem 19RQ
Summary Introduction
To review:
The structure and the function of the signal recognition particle (SRP).
Introduction:
Once proteins are synthesized as a polypeptide comprising of 70 amino acids, they are destined to their respective locations. This process was given by Gunter Blobel in 1975 as the signal hypothesis. The site of protein synthesis is the ribosomal endoplasmic reticulum (RER).They are then transported to different locations.
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Posttranslational processing enzymes may cleave a____________ or add chemical constituents to it
Why is correct?
QUESTION NO. 1
Much of procollagen formation occurs in the endoplasmic reticulum and Golgi apparatus which requires signal peptide. All of the following statements about targeting a protein for the ER are true except
A. signal peptide usually has a positively charged N-terminus and a stretch of hydrophobic amino acids.
B. signal peptide emerging from a free ribosome binds signal recognition particle (SRP).
C. signal peptide is usually cleaved from the protein before the protein is inserted into the ER membrane.
D. docking protein is actually an SRP receptor and serves to bind the SRP to the ER.
E. SRP and docking protein do not enter the ER lumen but are recycledQUESTION NO. 2
All of the following statements about telomerase are correct except
A. the RNA component acts as a template for the synthesis of a segment of DNA.
B. it adds telomeric repeats to the 5'-ends of the DNA strands.
C. it provides a mechanism for replicating the ends of linear…
Chapter 19 Solutions
Biochemistry: The Molecular Basis of Life
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