BIOD60H3 Study Guide - Peptide, Oligosaccharide, Cytosol
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QUESTION 1
One usual effect of the post-translational attachment of lipids to proteins is that the modified proteins are
a. | subsequently glycosylated by membrane-bound enzymes | |
b. | able to associate to membranes | |
c. | targeted to the luminal side of the plasma membrane | |
d. | targeted to proteasomal degradation | |
e. | targeted to the the Endoplasmic Reticulum |
1 points
QUESTION 2
A signal peptidase
a. | attaches a signal sequence to a growing polypeptide chain before it passes into the rough ER | |
b. | removes the initial methionine from a polypeptide chain | |
c. | removes a signal sequence from a polypeptide chain after it passes through a channel into the rough ER | |
d. | attaches an acetyl group to the 5' end of a polypeptide after removal of the initial methionine |
N-linked glycosylation attaches a complex carbohydrate onto the
a. | free amino group at the amino terminal end of the polypeptide | |
b. | amino group of asparagine | |
c. | hydroxyl group of serine | |
d. | amino group of lysine |
Which of the following is true about targeting of a secretory proteins?
A. Binding of SRP to the signal peptide and the ribosome temporarily accelerates protein synthesis. |
B. The newly synthesized polypeptides include a signal peptide at their carboxyl termini. |
C. The signal peptide is cleaved off inside the mitochondria by signal peptidase. |
D. The signal recognition particle (SRP) binds to the signal peptide soon after it appears outside the ribosome. |
E. The signal sequence is added to the polypeptide in a posttranslational modification reaction. |