Which of the following environments would harbor psychrophiles?
A. mountain lake with a water temperature of 12 °C
B. contaminated plates left in a 35 °C incubator
C. yogurt cultured at room temperature
D. salt pond in the desert with a daytime temperature of 34 °C
Ans: A. mountain lake with a water temperature of 12 °C
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In order for B cells to produce antibodies and cytotoxic T cells to attack infected host cells, they must first
A. be activated by interleukins, encounter an antigen, and then develop specificity toward it. B. recognize self markers, develop specificity for the markers, and then produce clones. C. encounter an antigen, develop specificity for that antigen, and then remember the antigen. D. undergo maturation, encounter their specific antigen target, and then become activated through cytokines.
Chlorophyll is located in ________, which are found in ________, which are concentrated in ________
A) thylakoids; chloroplasts; mesophyll B) chloroplasts; thylakoids; mesophyll C) mesophyll; chloroplasts; thylakoids D) mesophyll; thylakoids; chloroplasts
Antibiotic resistances are often acquired by
a. horizontal gene transfer. b. spontaneous mutations. c. movement of mobile genetic elements. d. all of the above.