Centrioles and a starburst cluster of spindle fibers would be found in
(a) both plant and animal cells.
(b) only plant cells.
(c) only animal cells.
(d) none of the above.
(a) both plant and animal cells.
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Cytoskeletal elements are found in the
A) Eubacteria. B) Archaea. C) Eukarya. D) choices B and C only E) all of the above
Acute glomerulonephritis is due to:
A) deposition of immune complexes in the kidney B) destruction of glomeruli by Streptolysin O C) formation of cross-reacting antibodies D) invasion of the kidney by Streptococcus pyogenes
What experimental evidence suggests that the N-terminal tails of histones participate in the formation of higher-order chromatin structure?
a) The tails cause histones to denature. b) Chromatin fibers prepared with H4 histones lacking their tails cannot fold into higher-order fibers. c) Chromatin fibers prepared with H4 histones possessing longer tails cannot fold into higher-order fibers. d) The tails when acetylated cause the dissolution of the 30-nm fibers. e) Chromatin fibers lacking tails are shorter.
Epithelial tissues
A) cause body movements. B) cover both external and internal body surfaces. C) sense stimuli. D) form a framework that supports the body.