Which group of animals are living representatives of the theropods, a lineage of bipedal predatory dinosaurs?
a. birds
b. crocodiles and alligators
c. snakes and lizards
d. turtles
e. mammals
ANSWER: a
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In SDS–polyacrylamide gel electrophoresis proteins are partially denatured and separated entirely as a function of their mass
Histones are an exception; they migrate more slowly than they should, as though they are much larger than they actually are. Why does this occur? A. Histones form dimers and tetramers, making them appear larger. B. Histones are heavily glycosylated, greatly adding to their mass. C. Histones have a large number of positively charged amino acid residues. The binding of SDS to the histones is not sufficient to mask these charges, resulting in slower migration. D. Histones have an affinity for polyacrylamide. E. Histones are somewhat insoluble, which slows their passage through the gel.
Which of the following is NOT a form of
passive transport? a. osmosis b. facilitated diffusion c. simple diffusion d. exocytosis e. none of these
What happens to the number of goblet cells found in the walls of the respiratory tract as it moves down from the upper conducting zone to the lower respiratory zone?
A) changes to ciliated pseudostratified epithelium B) decreases C) increases D) thickens E) no change