The hypothesis that species diversity is greater at lower latitudes than higher latitudes because low-latitude habitats are older would be supported if:
A. speciation rates were the same at high and
low latitudes.
B. speciation rates were higher at low latitude
than at high latitude.
C. speciation rates were higher at high
latitude than at low latitude.
D. speciation rates were more variable at
high latitude than at low latitude.
E. speciation rates were more variable at low
latitude than at high latitude.
A
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Which of the following genes is correctly matched with its function?
A. The Hox genes illustrate evolution of neural pathways. B. The BMP4 gene illustrates evolution of lungs for breathing air. C. The gremlin gene illustrates the evolution of the inner ear mechanism. D. The Pax6 gene illustrates the evolution of complex organs such as the eye. E. The gremlin gene along with the Pax6 gene code for development of the eye.
The structure(s) critical to the function of a chemical synapse include
_____ gap junctions. _____ neurotransmitters. _____ vesicles. _____ voltage-gated Ca2+ channels. _____ electrical signals.
What defines a lipid?
a. They are soluble in water. b. They are insoluble in polar solvents such as water. c. They are polymers. d. They always have a multi-ringed structure.
A sugar with three carbon atoms is a
A. triose sugar. B. trisaccharide. C. triglyceride. D. tripeptide.