The heart in a human embryo begins to beat
around ___ after fertilization.
a. 5 days
b. 3 weeks
c. 7 weeks
d. 9 weeks
e. 12 weeks
B
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Phorid flies are being used to combat the invasive red imported fire ants. How do phorid flies kill the ants?
a. They are predators of the ants. b. They produce a poison in their lining which kills the ants when eaten. c. They are parasitoids who lay their eggs in the ants body. d. They compete with the ants for food sources. e. They kill ant eggs.
What is the difference between the leading strand and the lagging strand in DNA replication?
A) The leading strand is synthesized in the ? direction in a discontinuous fashion, while the lagging strand is synthesized in the ? direction in a continuous fashion. B) The leading strand is synthesized continuously in the ? direction, while the lagging strand is synthesized discontinuously in the ? direction. C) The leading strand requires an RNA primer, whereas the lagging strand does not. D) There are different DNA polymerases involved in elongation of the leading strand and the lagging strand.
The pH indicator(s) in the Eosin Methylene Blue Agar is (are)
A. Neutral red B. Eosin Y & methylene blue C. Phenol red D. Methyl red E. Bile salts & brilliant green
Simplexviruses can establish latent infections of ________ cells.
A. B B. epithelial C. nerve D. T E. muscle