What type of infectious agent causes Creutzfeldt-Jakob disease in humans?
A. provirus
B. a viroid
C. a prion
D. a virus
C. a prion
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When sperm enter the epididymis, they ________
A) are mature B) are incapable of moving on their own C) are ready to fertilize an egg D) come from the vas deferens
A reproductive barrier that prevents individuals from closely related species from interbreeding is an example of ________
A) a prezygotic barrier B) allopatric speciation C) sympatric speciation D) geographic isolation of populations
Which of the following statements regarding genetic testing is false?
A) Genetic testing before birth requires the collection of fetal cells. B) Carrier testing helps determine whether a person carries a potentially harmful disorder. C) The screening of newborns can catch inherited disorders right after birth. D) Most human genetic diseases are treatable if caught early.
"Science is self-correcting." This means:
A) science is incapable of producing mistaken beliefs if its studies are carefully done. B) science only accepts what is true. C) scientists correct their personal biases before engaging in scientific study. D) science actively seeks to disprove its own theories and hypotheses. E) scientists always proofread each other's work.