Although heavy metals are no longer widely used as germicides, ________ is an effective algicide in lakes and swimming pools.
A. mercuric chloride
B. silver nitrate
C. lead acetate
D. copper sulfate
Answer: D
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The conical sea floor vents that spout sulfide-rich, super-heated water at temperatures up to 300ºC are called
A. yellow smokers. B. hydrothermal vents. C. warm vents. D. hot vents.
Signaling involves molecule A that binds another specific molecule B, often delivering the signal in the process. What do we call molecule A in this scenario?
a. target cell b. receptor c. ligand d. enzyme
Warts are caused by ________.
A. enveloped DNA viruses B. nonenveloped RNA viruses C. nonenveloped DNA viruses D. bacteria E. enveloped RNA viruses
What is the correct order of expression of the genes listed below in the determination of segmentation in Drosophila?
(1) Segment polarity genes (2) Hox genes (3) Gap genes (4) Pair rule genes A: 2, 3, 1, 4 B: 1, 2, 3, 4 C: 3, 1, 4, 2 D: 3, 4, 1, 2 E: 4, 3, 1, 2