The virulence factor of Yersinia pestis that is a protease that destroys C3b and C5a is

A. Yops.
B.
pla.

C. F1.
D. protein A.


B.

Biology & Microbiology

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What are the ecological consequences of acidification of rain and oceans?

A. They improve the health of ecosystems. B. Acid rain damages ecosystems, but ocean acidification improves the health of oceans. C. They damage the health of ecosystems. D. They do not have any consequences on ecosystems.

Biology & Microbiology

One of the limiting factors in engineering plants for nitrogen fixation is to prevent the binding of ________ to the enzyme nitrogenase and the subsequent inhibition of the enzyme.

A. calcium B. bacteria C. oxygen D. phosphorus E. cell membranes

Biology & Microbiology

The process by which new species originate

A. is germination. B. is extinction. C. occurred only once in Earth's history. D. is speciation. E. occurred for millions of years but is no longer occurring.

Biology & Microbiology

How are trans fats different from regular saturated fats?

A) Trans fats cannot form carbon-carbon double bonds. B) Trans fats have flattened fatty acids. C) Trans fats are liquid at room temperature. D) Trans fats do not contain glycerol.

Biology & Microbiology