Within its core a nucleosome contains ____ histones.
A. 2
B. 4
C. 6
D. 8
E. 64
D. 8
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A compound known as X-gal is widely used in molecular genetic research. When wild-type (normal) E. coli is grown on medium containing X-gal, the bacterial colonies turn blue. In contrast, when lacZ mutants are grown on medium containing X-gal
, the bacterial colonies remain their normal white color. X-gal is likely to be a compound _____. A) chemically similar to glucose B) chemically similar to galactose C) chemically similar to lactose D) that cannot be transported into lacZ mutants E) that can be transported only into lacA mutants
The primary reservoir for calcium that is released during excitation-contraction coupling in a skeletal muscle fiber is the
A. sarcoplasmic reticulum. B. endoplasmic reticulum. C. transverse tubules. D. Golgi bodies. E. troponin.
The 1992 plan of the European Union calls for
a. the complete mobility of economic resources across EU borders. b. establishing the British pound as the common currency. c. a central banking system in Zurich. d. a federal tax system similar to that of the United States.
The stomach mixes food with the secretions of the stomach wall to form ________
A) gastric juice B) a food ball C) chyme D) acid gastrin