Which of the following is bacteriostatic?
A. heating in an oven at 171°C for an hour
B. freezing below 0°C
C. filtration
D. autoclaving
E. flash pasteurization
Answer: B
Biology & Microbiology
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Which of the following characteristics is not shared by typical birds and mammals?
a. four-chambered heart b. milk production c. four limbs d. endothermy e. insulating skin structures
Biology & Microbiology
Which of the following would not be secreted across the tubule?
a. ammonium ions b. hydrogen ions c. creatinine d. carbon dioxide e. penicillin
Biology & Microbiology
Each year, plants and algae remove approximately ________ of the CO2 in the atmosphere.
A. half B. 1/7th C. 1/50th D. 100%
Biology & Microbiology
Scientists have identified and named
a. all living species b. all living and extinct species c. all extinct species d. a fraction of all species
Biology & Microbiology