Determining urease activity and growth on niger seed agar is helpful in determining which type of yeast?
a. C. albicans
b. Trichosporon
c. C. neoformans
d. M. furfur
C
The rapid urease test (Procedure 62-2) is a most useful tool for screening for urease-producing yeast recovered from respiratory secretions and other clinical specimens. An alternative to tradi-tional urease testing is the rapid selective urease test (Procedure 62-3). This method appears to be useful in rapidly detecting C. neoformans. Using these screening tests is helpful to make a pre-sumptive identification of C. neoformans. In instances in which inoculum is limited, the labora-torian must use tests that can be performed and then prepare a subculture so that additional tests can be performed later. Often, inoculating the organism onto the surface of a plate of niger seed agar is just as fast; the results may be obtained during the same day of incubation at 25°C. This is discussed further in this section.
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Regarding transitions between stages of the cell cycle, scientists have
a. already discovered many of the proteins involved b. figured out how the proteins communicate with each other c. determined how the proteins operate as small nano-machines to perform their functions d. shown that mammalian cells are easier to work with than Saccharomyces cerevisiae e. no idea which proteins are needed
Ecosystems may lose nitrogen through
a. denitrification. b. nitrification. c. nitrogen fixation. d. all of these. e. none of these
Glucose moves through a protein transporter down its concentration gradient into the cell. This is an example of ____
a. diffusion b. endocytosis c. exocytosis d. osmosis e. facilitated diffusion
Why are the testicles kept outside of the body?
A) They lower the temperature for sperm production. B) The testicles cushion the penis and stop it from hanging too low. C) There's no reason for this. D) Earlier in human evolution, visible testicles helped males to sexually attract females.