An mRNA that contains the coding sequence for two or more structural genes is called a
A. polyintronic mRNA.
B. polyextronic mRNA.
C. polycistronic mRNA.
D. polyexpressive mRNA.
E. polyrepressor mRNA.
C. polycistronic mRNA.
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What is the chemical basis for water's role as the universal solvent?
A. Because water is polar, it disrupts most covalent bonds. B. Because water is polar, it disrupts other hydrogen bonds. C. Because water is polar, it disrupts ionic bonds. D. a and b. E. b and c.
The mammalian kidney has an outer layer called the _____ and an inner layer called the _____
A. cortex; medulla B. pelvis; glomerulus C. epithelium; endothelium D. medulla; pelvis E. glomerulus; cortex
In tuberculosis, when a caseous lesion calcifies, it is called a ________.
A. tubercle B. tuberculous cavity C. Ghon complex D. All of the choices are correct.
A male fish that uses bright lights at the top of its tail fins to identify itself to females when breeding is a type of:
a. an anglerfish. b. a lanternfish. c. an opossum shrimp. d. a viperfish. e. a gulper eel.