The acid-fast stain is specifically designed for bacteria whose cell walls contain:
a. teichoic acids.
b. mycolic acids.
c. peptidoglycan.
d. disaccharide-pentapeptide subunits.
B
Mycolic acids render the bacterial cells resistant to decolorization and thus cause acid-fast or-ganisms to maintain the primary stain in the acid-fast staining procedure.
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Among couples using a method of birth control consistently and correctly, the most important determinant of pregnancy risk is ______.
[A] their marital status [B] their ethnic or racial group [C] their income group [D] their frequency of sex
In prokaryotes, the DNA molecule that makes up a chromosome is ____ and has ____ replication origin
a. circular; one b. circular; more than one c. linear; more than one d. linear; one e. linear; no
The primary cause of desertification in the world today is
a. increased salinity resulting from irrigation practices. b. overgrazing of marginal lands. c. clearing and degradation of tropical forests. d. herbicide and fertilizer runoff. e. use of water for industry.
The diverse topography of mountainous regions generally supports more species of plants and animals than the consistent terrain of flatlands
Indicate whether the statement is true or false