A fatty acid that has the formula C16H32O2 is:
a. saturated
b. unsaturated
c. branched
d. hydrophilic
e. part of a steroid molecule
Ans: a. saturated
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Nematocysts in cnidarians are:
a. reproductive cells b. excretory organs c. sets of muscle cells d. circulatory cells e. defensive cells
A pH of 10 is how many times as basic as a pH
of 7?
a. 2 b. 3 c. 10 d. 100 e. 1,000
You wish to learn if the initiation of root hair formation depends on either translation or transcription. Roots were treated with actinomycin D, cycloheximide, and mock treated with a control solution without either of the two inhibitors. You find that root hair initiation was inhibited when mock treated with the control solution and in the presence of either cycloheximide or actinmycin D. From this you can conclude that:
A) Both transcription and translation are required. B) Only transcription is required. C) Only translation is required. D) More data is needed.
Polio is transmitted by ingestion of water contaminated with human feces containing the poliovirus. What would be the preferred portal of entry for the poliovirus?
a. mucous membranes of the respiratory tract b. mucous membranes of the gastrointestinal tract c. through the skin d. parenteral route