Freshwater fishes excrete most of their nitrogenous wastes through the kidneys. Indicate whether the statement is true or false
False - gills
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Which element is most likely to accept an electron from another atom?
a. chlorine (7 valence electrons) b. calcium (2 valence electrons) c. neon (8 valence electrons)
d. carbon (4 valence electrons) e. potassium (1 valence electron)
In the Ames test for mutagenicity,
A) reverse mutations convert auxotrophs to prototrophs that survive. B) colonies are due to forward mutations that convert prototrophs to auxotrophs. C) cells are treated with mutagen and only cells with no mutations survive. D) cells are treated with excess amino acids and cells with mutations are killed. E) rat liver enzymes are present to protect cells from mutation.
A nuclear envelope has four of the following characteristics. Which is the exception?
a. single lipid bilayer b. continuous with endoplasmic reticulum c. possesses pores d. controls passage of substances into and out of nucleus e. separates DNA from cytoplasm
Arrestin binding to GPCRs __________.
a) causes the binding of additional G proteins b) stabilizes G proteins c) causes denaturation of G proteins d) stabilized GPCRs e) prevents further activation of additional G proteins