Most microorganisms pathogenic for humans grow best in the laboratory when cultures are incubated at
The process by which microorganisms form ATP during the fermentation of glucose is characterized by
(A) Coupling of ATP production with the transfer of electrons
(C) The reduction of oxygen
(D) Substrate phosphorylation
(E) Anaerobic respiration
The major effect of a temperature of 60oC on the growth of a mesophile such as Escherichia coli is to
(A) Destroy the cell wall
(C) Destroy nucleic acids
(D) Solubilize the cytoplasmic membrane
(E) Cause formation of endospores
Polymerization of building blocks (eg, amino acids) into macromolecules (eg, proteins) is achieved largely by
A strain of E coli does not require vitamins when grown in a defined medium consisting of glucose, mineral salts, and ammonium chloride. This is because E coli
(A) Does not use vitamins for growth
(B) Obtains vitamins from its human host
(C) Is a chemoheterotroph
(D) Can synthesize vitamins from the simple compounds provided in the medium
(E) Ammonium chloride and mineral salts contain trace amounts of vitamins
Which of the following is NOT a mechanism for generating metabolic energy by microorganisms?
Which of the following terms best describes a microorganisms that grows at 20°C?
The ability to assimilate N2 reductively via NH3 is called
(C) Assimilatory nitrate reduction
Which of the following is NOT assimilated by eukaryotic cells?
Bacteria that are obligate intracellular pathogens of humans (eg, Chlamydia trachomatis) are considered to be