What is the function of ribosomes?
a. plasma membrane stabilization
b. receiving raw materials from the
environment
c. polypeptide assembly
d. increasing tonicity
e. directing the activity of DNA
C
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Logistic growth of a population is represented by dN/dt = _____
A) B) rmax N C) rN (K + N) D) rN E) rNrN
Match the following items with the correct phrases.
_______1. The complete destruction of all living organisms, including cells, spores, and viruses. _______2. The use of antiseptics is an example of a __________ technique. _______3. Autoclaving for 15 to 20 minutes at 15 psi and 121°C is one method of accomplishing this. _______4. The destruction or removal of pathogens by physical or chemical methods. _______5. Heating to 60°C for 30 minutes is one method of accomplishing this; sufficient to kill pathogens and reduce total bacterial counts. _______6. Heating in a 160°C oven for 2 hours would accomplish this. _______7. The reduction of microbial populations to levels considered safe by public health standards. a disinfection b. pasteurization c. sanitization d. sterilization
Ventilation by an individual exercising strenuously is
indicated by a. A. b. B. c. C. d. D. e. E.
What will happen if a bacterial cell is placed in 10% NaCl with penicillin?
A) The cell will plasmolyze. B) The cell will undergo osmotic lysis. C) Water will enter the cell. D) Penicillin will diffuse into the cell. E) No change will result; the solution is isotonic.