The milk of cetaceans is very rich in:
a. fat.
b. protein.
c. carbohydrates.
d. cellulose.
e. DNA.
A
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If a foreign gene is cloned into an expression host, it is important that the host itself
A) not produce the protein being studied. B) produce the protein in larger amounts than the vector. C) repress the genetic expression being studied. D) produce signal proteins to tag the host protein.
Which of the following female organisms do
NOT contain XX chromosomes?
a. humans b. fruit flies c. cows d. butterflies e. cats
Vascular tissue that transports organic nutrients and sugars from the leaves to the roots is
A. phloem. B. cambium. C. xylem. D. periderm. E. sclerenchyma.
Which of the following diseases is considered an emerging disease because it was unknown before 1987?
A. anaplasmosis B. Brill-Zinsser disease C. murine typhus D. Rocky Mountain spotted fever E. lymphogranuloma venereum