When one parental allele is expressed and the other is silenced, the phenomenon is called ____
a. sex-linked inheritance
b. uniparental inheritance
c. cytoplasmic inheritance
d. genomic imprinting
e. maternal inheritance
ANSWER: d
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Island species are particularly vulnerable to extinction for all of the following reasons except
A. humans have altered habitats. B. island species have lost the ability to escape predators. C. humans have introduced competitors. D. humans have introduced diseases. E. fewer endemic species are found on islands.
Both Streptococcus pyogenes and Corynebacterium diphtheriae are highly pathogenic, and the disease symptomology can be very severe. Why is this?
A. They induce autoimmune states in the patients. B. There are no antibiotics useful for diseases caused by these bacteria. C. Infants and children are the high-risk groups, and their mortality rate is higher than for other ages. D. Both bacteria produce potent exotoxins.
The interaction of sympathetic and parasympathetic systems is best described as _____
a. antagonistic b. cooperative c. overriding d. synergistic e. ineffective
Why is vaccination for rubella recommended?
A) It has a high mortality rate in school-age children. B) Death from secondary infections is common. C) There is a high incidence of congenital infections and birth defects. D) Health care workers have a high incidence of infection. E) It is no longer recommended; rubella has been eradicated.