The bicuspid (mitral) valve is located between the
a. left and right atria.
b. right atrium and right ventricle.
c. left and right ventricles.
d. left atrium and left ventricle.
e. left ventricle and the aorta.
D
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Suppose there was a mutation in the segment polarity genes of Drosophila. What do you suppose might be the outcome?
A) Several segments of the embryo will be missing. B) Every other segment of the embryo will be missing. C) Legs will appear in the place of antennae. D) Antennae will appear in a different part of their usual segment.
Alkaloids are considered "expensive" defense compounds to produce because:
A. they contain a lot of carbon, which is costly for plants to concentrate. B. they vaporize readily, so they constantly have to be synthesized. C. they contain nitrogen, an essential and often limiting element plants need. D. they often function in very small concentrations. E. they contain proteins, which are very costly for a plant to produce.
In the heart of a reptile or amphibian, where would you expect to find oxygenated blood? Select all correct choices
A. in the right atrium B. in the left atrium C. mixed with de-oxygenated blood in a common ventricle D. mixed with de-oxygenated blood in the right ventricle E. Nowhere; oxygenated blood does not travel through the heart of these animals.
The secondary structure of proteins may take the
form of a. twists. b. bends. c. loops. d. folds. e. all of these.