The Ebola virus is frequently spread by ________, and its natural hosts and vectors are ________
a. direct physical contact / insects
b. direct physical contact / primates
c. the respiratory route / insects
d. the respiratory route / primates
Answer: D
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HeLa cells have been used in research to
a. identify viral strains. b. investigate cancer. c. study the effects of radiation on cells. d. develop tissue culture techniques that produced a polio vaccine. e. all of these.
If a daughter expresses an X-linked recessive gene,
she inherited the trait from a. her mother. b. her father. c. both parents. d. neither parent. e. her grandmother.
For diffusion to occur, there must be
A) a gradient. B) water. C) ATP. D) a membrane.
A 38-year-old woman is going to ovulate in about a week. For how long has the primary oocyte in her Graafian follicle been arrested at prophase I of meiosis?
A. 38 years B. About a day C. 1 week D. 3 weeks