Microcystis aeruginosa is a species of cyanobacteria. What CANNOT be true of this species?
A. It synthesizes organic molecules.
B. It is an obligate anaerobe.
C. Its cells contain an extensive thylakoid.
D. It uses ammonia to produce proteins.
E. It secretes mucilage.
B. It is an obligate anaerobe.
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You are trying to design a protein that will be expressed in Escherichia coli and secreted outside of the cell for purification and use as a pharmaceutical. E. coli is a gram-negative cell and the protein folds after it has exited the cell. Which secretion system would work best for this project? Support your answer with evidence based on the properties of E. coli, the protein, and the secretion system.
What will be an ideal response?
Select all correct descriptions of the liver.
a. largest glad in body b. removes poisonous substances from the blood c. composed of a large of function units called lobules d. receives blood from the GI tract
The French taxonomist who, in 1809 was the first scientist to suggest that organisms that use one part of their body repeatedly would increase their abilities was
A. Charles Darwin B. Alfred Russel Wallace C. Jean lamarck D. Georges Buffon. E. Charles Lyell.
Viruses can enter animal cells by
A. endocytosis. B. exocytosis. C. poking holes in their membranes and entering. D. triggering an active transport mechanism.