Which of the following statements about AIDS is true?
A) The AIDS vaccine can prevent the spread of HIV.
B) There is now a treatment for AIDS that is simple and effective.
C) Using condoms during sex prevents the spread of the virus that causes AIDS.
D) AIDS patients live no longer than 2 to 3 years.
Answer: C
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Establishment of lysogeny by phage is usually influenced strongly by
A. the physiological condition of the host at the time of infection. B. components of the host replication machinery. C. the previous host infected by the virus. D. None of the choices are correct.
In cocker spaniels, black coat color (B) is dominant
over red (b), and solid color (S) is dominant over spotted (s). If two dihybrids (Bb Ss) are crossed, what fraction of the black, solid offspring will be homozygous? a. 4/16 b. 9/16 c. 1/9 d. 3/16 e. 3/4
Four of the five choices listed below are associated
with the lactose operon. Select the exception. a. regulator b. terminator c. operator d. promoter e. structural gene
The fruit produced by angiosperms is an evolutionary adaptation that most often
A. nourishes the seeds within the fruit on ripening B. aids in seed dispersal C. attracts pollinators D. inhibits seed germination until favorable environmental conditions occur E. provides an energy source for the plant egg cell prior to fertilization