Answer the question using the accompanying figure. Which type of cell is represented in this figure?
a. a Gram-positive bacterium
b. a Gram-negative bacterium
c. either a Gram-positive or a Gram-negative bacterium
d. an archaeal cell
e. any prokaryotic cell
ANSWER: b
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Which of the following is true of the trafficking of proteins from the cytosol to the endoplasmic reticulum?
A. The proteins are first completely synthesized in the cytosol. B. The signal recognition particle (SRP) does not enter the ER lumen. C. The polypeptide signal sequence is cleaved by the peptide translocation complex. D. The SRP receptor faces the ER lumen side of the ER membrane.
All strains of Staphylcoccus aureus can produce food poisoning.
Answer the following statement true (T) or false (F)
When membrane lipids are extracted from cells and used to prepare artificial lipid bilayers, cholesterol and sphingolipids tend to self-assemble into ________ that are more gelated and highly ordered than surrounding regions consisting primarily of _________.
a) microdomains, integral proteins b) microdomains, phosphoglycerides c) liquid crystals, microdomains d) liquid crystals, phosphoglycerides e) macrodomains, phosphoglycerides
Probes for cloned genes use ____.
A. complementary nucleotide sequences tagged with a detectable label B. specific antibodies that kill all the cells C. specific enzymes that lyse all the cells D. certain bacteria that glow when they take up the genes E. DNA ligase