The drug mifepristone (RU-486) is a contraceptive that ____
a. blocks passage of sperm through the male reproductive tract
b. blocks passage of sperm through the female reproductive tract
c. prevents ovulation
d. causes shedding of the endometrial lining and any implanted embryo
e. prevents implantation by blocking estrogen receptors in the uterus
ANSWER: d
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Which of the following is true about bacteria?
a. most bacteria are harmful b. bacteria only inhabit surfaces c. we have more bacteria cells that our own cells d. bacteria are restricted in their distribution to certain ecosystems e. bacteria are the most common organisms in the Domain Eukarya
The smooth endoplasmic reticulum has ribosomes attached to it
Indicate whether the statement is true or false
Which of the following statements regarding toxoids is FALSE?
A) They are produced against the toxin of the microorganism rather than the microorganism itself. B) They provide lifelong immunity. C) They stimulate antibody immune responses. D) They have few antigenic determinants. E) They are chemically or thermally modified.
The incentive for economic activity in capitalism is ____. However, in socialism, it is __________
Fill in the blank(s) with the appropriate word(s).