Which of the following factors DOES NOT influence the degree of killing of microorganisms?
A. Concentration of disinfecting agent
B. type of organisms
C. number of organisms present
D. oxygen content of the environment
Ans: D. oxygen content of the environment
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Which of the following is not part of the axial skeleton?
A. pelvic girdle B. ribs C. skull D. sternum E. vertebral column
All of the following statements about master
genes are true EXCEPT:a. They orchestrate layers of development. b. They are highly conserved over evolutionary time. c. Mutations within these are frequently devastating. d. They are highly variable in their sequences between species. e. Mutations usually result in changes in body plan
One atom of sodium has a mass number of 22 units; another atom of sodium is 23 units. These two atoms are
A. nonreactive. B. unstable. C. ions. D. isotopes.
What is one of the most important survival mechanisms of tubercular bacteria within the body?
A. Eludes killing by the alveolar macrophages (white blood cells of the lung) by preventing fusion of lysosomes with the phagosome B. Eludes the immune system by killing the white blood cells wuickly C. Eludes killing by alveolar macrophages by secreting a toxin that kills these cells D. Eludes the immune system by constant changing protein coats (antigens)