How do proteins become embedded in the membrane of the endoplasmic reticulum?
A) by protein chaperones that insert polypeptides into the ER membrane
B) by splicing of proteins on either side of the ER membrane
C) via stop- and start-transfer sequences that stop and start translocation of a polypeptide through the ER membrane, resulting in transmembrane proteins
D) by post-translational import can results in a transmembrane ER protein
E) via transit sequences that target polypeptides made in the cytosol for the ER membrane
Answer: C
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The most accurate description of TEMPORAL summation is
A. Several inputs from DIFFERENT presynaptic cells create EPSPs that sum together to bring the neuron over the threshold for an action potential. B. Several inputs from the SAME presynaptic cell arrive in rapid succession, summing into a larger depolarization that brings the neuron over the threshold for an action potential.
People at greatest risk for pneumococcal infections include all the following except
A. those with underlying lung disease and viral infections. B. adolescents and young adults. C. patients without a spleen. D. young infants. E. the elderly.
Which one of the following organelles is involved in the production of proteins that are exported from the cell?
A) rough endoplasmic reticulum B) lysosome C) mitochondrion D) smooth endoplasmic reticulum E) centriole
The condition known as microbial antagonism may be defined as
A) microorganisms that remain with a person throughout life. B) a relationship between two organisms where one member harms the other. C) a relationship between two organisms where only one member benefits. D) an unsuccessful microbial invasion due to the presence of preexisting microbes. E) a relationship between two organisms where both members benefit.