When spermatogonia divide, the two daughter cells produced are a spermatogonium and a
A) sperm.
B) spermatocyte.
C) spermatid.
D) spermatozoon.
E) Sertoli cell.
Answer: B
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A researcher engineers a deletion in the genome of sperm cell DNA that inhibits production of an enzyme in the sperm cell membrane. The researcher then adds the sperm to a culture dish with a secondary oocyte, along with chemicals to guide the sperm to the oocyte. Upon observation, it is found that the sperm fails to penetrate the corona radiata of the oocyte. What enzyme has been deleted from the sperm membrane?
A. Juno B. Catalase C. Acetylcholinesterase D. Hyaluronidase
Indicate the order of each of the following in a descending pathway.(1) Cerebral cortex(2) Pyramids(3) Cerebral peduncles(4) Internal capsule
A. 1, 3, 2, 4 B. 1, 2, 3, 4 C. 1, 4, 3, 2 D. 2, 4, 3, 1 E. 1, 3, 4, 2
The cheekbone is called the:
a. zygomatic b. maxilla c. mandible d. none of the above
The development of fever
a. results from resetting of the medullary thermoregulatory center b. may develop when mast cells release pyrogens c. is mediated by prostaglandins d. is both a and b e. is all of the above