Outside a host cell a virus is called a(n):
a. capsid.
b. virion.
c. nucleocapsid.
d. envelope.
e. glochidia.
B
You might also like to view...
Terrestrial plants must maintain a balance between the need for CO2 and the need to avoid desiccation. One response to these conflicting forces is that ___________________
A. stomata close when photosynthesis causes internal CO2 levels to drop. B. stomata close when guard cells lose water. C. guard cells shrink from water loss, causing stomata to open. D. stomata open in response to O2 buildup. E. water is actively transported into the guard cells, causing stomata to close.
Methylotrophic bacteria generate ATP by oxidizing methane to methanol then to formaldehyde, which is excreted.
Answer the following statement true (T) or false (F)
When the gene for rat growth hormone was injected
into mouse eggs, a. they were subsequently implanted unsuccessfully into female mice. b. a third of the offspring of the surrogate mothers grew much lager than their littermates. c. the rat gene integrated into the mouse DNA, but did not express itself. d. the rat gene failed to integrate into the mouse DNA. e. all of the offspring of the surrogate mothers grew much larger than their littermates.
After his return to England, Darwin pondered which of the following questions most heavily?
a. What could explain the great numbers and variety of species? b. Does the fossil evidence support uniformitarianism? c. Are the extinct and living armadillos the same species? d. Did Galápagos mockinbirds have a common mainland ancestor? e. Will natural selection work in England?