Parasites act as agents of ________, leading to changes in the host population that make it more resistant to the parasite
Fill in the blank(s) with correct word
natural selection
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Two species of finches found on the same Galapagos island but feeding on different food sources is an example of _____- speciation.
A. allopatric B. sympatric C. prezygotic D. postzygotic E. outgroup
Mitotic Cdk-cyclin is active when it is
A) singly phosphorylated. B) acetylated. C) doubly phosphorylated. D) doubly methylated. E) cleaved by proteases.
Even though the autumn may be unusually warm, the leaves from deciduous trees begin to drop during September. Which of the following is the best explanation?
A. The trees are responding to shorter days. B. The autumn months are usually wetter because the summer rains were delayed. C. The effects of phototropism are operating “right on schedule.” D. There is not enough sunlight to carry on photosynthesis any longer. E. The trees are responding to consistent temperatures.
What happens next after the hormone glucagon binds to a G-protein coupled receptor (GPCR)?
A. The glucagon enters the cell through the GPCR and diffuses to the nucleus where it interacts with transcription factors. B. The G-protein loses GDP and gains GTP becoming activated. C. The G-protein loses GTP and gains GDP becoming activated. D. The G-protein loses GTP and gains GDP becoming inactivated. E. The G-protein loses GDP and gains GTP becoming inactivated.