Globally, cigarette smoking kills four million people
annually. That number is expected to increase to
_____ million by 2030.
a. 10
b. 50
c. 100
d. 150
e. 250
Answer: a
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Over time, cytotrophoblasts ____ while syncytiotrophoblasts ____.
A. become multinucleate; degenerate B. carry out immune modulation; become multinucleate C. degenerate; develop into spiral arteries D. degenerate; carry out immune modulation E. develop into capillaries; carry out immune modulation
For natural selection to result in evolutionary change _____________.
a. variation must exist in a population b. reproductive success of different phenotypes must differ c. variation must be inherited from one generation to the next d. all of the choices are correct
Epstein-Barr virus has the following characteristics, except
A) It has a 30-50 day incubation period B) It multiplies and is latent in the parotid gland C) It is transmitted by direct oral contact and saliva D) It infects the respiratory epithelium E) It can be transmitted by contaminated blood transfusions and organ transplants
What is the largest single source of radiation exposure for the average person in the U.S.?
a. radon b. medical X-rays c. cosmic d. nuclear medicine e. consumer products