Digestion is ________.

A. Only chemical
B. Only mechanical
C. Both mechanical and chemical
D. Neither mechanical nor chemical


Answer: C

Biology & Microbiology

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The function of the rugae of the stomach is to:

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Biology & Microbiology

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.

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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

Biology & Microbiology

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

Biology & Microbiology