Answer the following questions true (T) or false (F)
1. A microbe is either pathogenic or it is not. A microbe is either virulent or it is not. Both pathogenicity and virulence are all-or-nothing terms.
2. A microbe with a low ID50 does not necessarily cause severe disease.
3. A pathogen which uses a specific portal of entry will only be able to establish an infection in the system associated with that portal.
1. FALSE
2. TRUE
3. FALSE
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Secondary treatment of sewage involves the use of which type of process?
A. Virus removal/inactivation B. Biological removal of inorganic nutrients C. Biological removal of dissolved organic matter D. Physical/chemical removal of insoluble particulate materials
Which of the following would NOT be maximally reabsorbed from the filtrate?
a) water b) glucose c) sodium ions D) urea e) amino acids
Which type of digestion begins as a result of our teeth chewing food into small pieces?
A) synthetic B) chemical C) enzymatic D) mechanical
The initial degradation of cellulose that initiates microbial growth in the Winogradsky column is carried out by ________.
A. Desulfovibrio B. Rhodopseudomonas C. cyanobacteria D. Clostridium