Which gland requires the element iodine to produce its hormones?
A) adrenal medulla
B) thyroid
C) pineal
D) ovary
Answer: B
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Schistosoma and Plasmodium species both require
A) direct sexual contact for transmission. B) immunocompromised hosts. C) transmission by insect vectors. D) two hosts to complete their life cycle and reproduce.
Gene regulation by siRNA is ____ in eukaryotes and may have evolved originally as a ____
A. rare; way to regulate gene expression B. widespread; way to regulate gene expression C. rare; defense against mutations that may cause cancer D. widespread; defense against viruses E. rare; defense against viruses
When DNA fragments are separated by electrophoresis, ________
a. the largest fragments move the fastest b. neutrally charged fragments move the fastest c. the smallest fragments move the fastest d. all the fragments move at the same rate
A genus in the family Enterobacteriaceae that is a major pathogen of crop plants is ________.
A. Erwinia B. Shigella C. Yersinia D. Proteus