Digestion is ________.
A. Only chemical
B. Only mechanical
C. Both mechanical and chemical
D. Neither mechanical nor chemical
Answer: C
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The function of the rugae of the stomach is to:
a. secrete amylase. b. crush the food. c. increase the holding capacity of the stomach. d. mix the food with gastric juices. e. increase the surface area for secretion
For E. coli cells, the sugar lactose acts as an inducer. In general, an inducer:
A: binds to the promoter and prevents the repressor from binding to the operator. B: stimulates the synthesis of the needed enzyme(s). C: binds to the operator and prevents the repressor from binding at this site. D: inhibits the synthesis of the needed enzyme(s). E: is the same as a promoter.
The first class of drugs developed to treat AIDS, such as AZT, were known as reverse transcriptase inhibitors. They worked because they _____
A) targeted and destroyed the viral genome before it could be reverse transcribed into DNA B) bonded to the dsDNA genome of the virus in such a way that it could not separate for replication to occur C) bonded to the viral reverse transcriptase enzyme, thus preventing the virus from making a DNA copy of its RNA genome D) prevented host cells from producing the enzymes used by the virus to replicate its genome
When you first move to a city, you can hardly sleep because of the nighttime traffic noise. Within a week, you don't notice it at all. This is an example of ________
Fill in the blank(s) with correct word