Genetic recombination is possible because of ________ during or after meiosis.
A. independent assortment
B. fertilization with a nonrelated gamete
C. crossing over
D. All of these are correct.
Answer: D
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Protozoan cysts are
A. necessary for transmission to a new host. B. part of all protozoan life cycles. C. the primary form of replication. D. analogous to bacterial endospores. E. are produced by binary fission.
Why may you be asked whether you are allergic to eggs before receiving a vaccination?
a. Some viruses are grown and isolated in embryonated eggs; especially those used for vaccines. The egg proteins may still be present in the viral vaccine preparations. b. Some viruses used for vaccines are grown and isolated in embryonic eggs. Because of their growth in this environment, you may be allergic to the vaccine. c. You are asked about allergies as a precaution any time you receive a vaccine. d. This is an incorrect statement. You are usually never asked about allergies before receiving a vaccine.
The development of colon cancer occurs slowly, and colon cancer is more frequently seen in the elderly than the young. This is most likely because
A) cancer cells don't have mitochondria, so they grow slowly. B) usually six or more somatic mutations must occur to give rise to the cancer, which takes time. C) cancer cells have to wait until new blood vessels grow into the area, which takes much time. D) most cancer mutations interfere with mitosis, so cell division occurs more slowly.
What is the definition of morbidity?
A) deaths due to sexually transmitted infections during a specific time period B) death C) the number of deaths during a specific time period D) existence of disease E) the number of infections during a specific time period