Which of the following is NOT a major cellular target of chemical antiseptics and disinfectants?
A. Cytoplasmic membrane
B. Cytoskeleton
C. Cell wall
D. Synthesis of proteins and nucleic acids
B. Cytoskeleton
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The Hin recombinase of Salmonella typhimurium will function under which of the following conditions?
A. Only when the hix sequences are on the same supercoiled DNA molecule. B. Only when the hix sequences are oriented in the same direction relative to each other. C. Only when the Hin recombinase accessory proteins have dissociated will recombinase activity occur. D. Only when an enhancer sequence is present on a different chromosome than the hix sequences. E. All of the choices given are correct.
The membrane potential of a neuron is defined as the ____
a. measured capacity of a neuron to create an electrical impulse b. voltage in the neuron plasma membrane c. threshold potential of a neuron d. the electric gradient across a neuron’s plasma membrane e. amount of voltage it takes to stimulate a neuron to fire
What is contained within the polar body?
A. corpus luteum B. egg cell C. primary follicle D. discarded chromosomes E. sperm cells
This organism, belonging to the family Enterobacteriaceae, grows best at 25°C to 30°C. Domestic and wild rats and other animals can carry this organism. What is the medium of choice?
a. MacConkey agar b. Xylose-lysine-deoxycholate (XLD) agar c. Cefsulodin-irgasan-novobiocin (CIN) agar d. Hektoen enteric (HE) agar