The cells that line organs that must contain fluids, such as the intestine or bladder, are held together by _____ junctions
adhesion
gap
neuroglial
tight
D. tight
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True or False. Phylogenetic trees can be used to infer character states of extinct organisms
A. true B. false
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 component of plasma membranes?
A. glycosylated proteins B. phospholipids C. glycolipids D. glycosylated nucleic acids E. cholesterol
DNA is replicated by a process called __________. Fill in the blank(s) with the appropriate word(s)