The zona pellucida is
A) a protective layer around the secondary oocyte.
B) a protective layer around the sperm.
C) a bump on the head of a sperm that contains enzymes.
D) the biggest constriction of a chromosome.
A) a protective layer around the secondary oocyte.
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H. ducreyi requires what special media to grow?
a. Heart infusion–based agar, supplemented with 10% IsoVitaleX and vancomycin b. Mueller-Hinton–based chocolate agar, supplemented with 1% IsoVitaleX and vancomycin c. Heart infusion–based chocolate agar, sup-plemented with 10% fetal bovine serum and vancomycin d. Mueller-Hinton–based agar, supplemented with 10% IsoVitaleX and vancomycin
The concept of "immune privilege" explains why the central nervous system has
A. a completely different set of immune responses. B. more MHC markers than other tissues. C. a reduced immune response compared to the rest of the body. D. a greater immune response than the rest of the body.
Parasites have often been described incorrectly as having "devolved" from a more highly evolved organism. Why would it be more accurate to say that they are just as evolved as any other organism?
What will be an ideal response?
The DO represents the _____ dose for human cells.
a) mean survival b) mean lethal c) 50% survival d) 50% lethal