Salvarsan was
A. used to treat syphilis.
B. discovered in the mid 1900s.
C. first discovered as a product of Penicillium notatum.
D. discovered by Robert Koch.
E. formulated from the red dye prontosil.
Answer: A
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Any gene located on a sex chromosome
A) is called a recessive gene. B) is called a sex-linked gene. C) will exhibit pleiotropy. D) will exhibit codominance.
Carriers and reservoirs are both considered
A. Contributors to period of acme in the disease B. Zoonoses C. Capable of transmitting infectious disease D. Opportunistic in the disease process E. Direct methods for disease transmission
Which of the following does not have an autosomal recessive pattern of inheritance?
a. cystic fibrosis b. Huntington disease c. phenylketonuria d. sickle cell disease e. None of these are correct.
Many male songbirds have very distinctive songs that are used to attract females. These songs are an example of a ________ isolating mechanism.
A. postzygotic, ecological B. prezygotic, behavioral C. prezygotic, temporal D. prezygotic, gamete fusion E. postzygotic, mechanical