During spring time in Maine, male moose often enter a cow pasture and begin calling to the female cows. The moose may even try to mount the female but the male genitalia do not fit properly inside the female genitalia. This is an example of
A. mechanical isolation.
B. temporal isolation.
C. habitat isolation.
D. behavioral isolation.
E. gametic isolation.
A. mechanical isolation.
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A laboratory in which Ebola virus is studied would be classified as a BSL-________ laboratory
A) 1 B) 2 C) 3 D) 4
Of the G3P generated in the Calvin cycle, 5/6 will be used to regenerate RuBP. A company
manufacturing widgets would go out of business if 5/6 of the widgets were recycled at the manufacturing site rather than being sold. And yet plants survive this extreme inefficiency. Why?
a. Actually, 5/6 of the G3P is used to build glucose and only 1/6 of the G3P is needed to regenerate RuBP. b. Plants are extremely efficient in other ways and that compensates for this anomaly. c. There is unlimited CO2 for the plant to use, so it's okay to "waste" some by regenerating RuBP. d. The plant expends no energy to acquire the light energy that drives the Calvin cycle, so there is no pressure on the system to become more efficient. e. The cyclic pathway of the light reactions compensates for the energy lost in RuBP regeneration.
In the sequence of events during translation, what is the next step after an mRNA binds to the ribosome's small subunit?
A) An amino acid from a tRNA in the P site attaches to an amino acid on the tRNA in the A site. B) A tRNA binds to the start codon, and the large ribosomal subunit joins the ribosome. C) A tRNA is released from the E site. D) A tRNA enters the A site of the ribosome. E) The ribosome shifts down the mRNA by one codon.
Which of the following choices reflects the appropriate order of locations through which a protein destined for the plasma membrane travels?
(a) lysosome -> endosome -> plasma membrane (b) ER -> lysosome -> plasma membrane (c) Golgi -> lysosome -> plasma membrane (d) ER -> Golgi -> plasma membrane