The pH indicator(s) in the MacConkey Agar is (are)
A. Eosin Y & Methylene blue
B. Phenol red
C. Bromothymol blue
D. Bromocresol purple
E. Neutral red
Ans: E. Neutral red
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The influenza virus is typical of many animal viruses in that is has an envelope composed of lipids and glycoproteins. Which of the following statements about the envelope is ACCURATE?
A. The envelope glycoproteins are encoded by genes found in the host genome. B. The envelope is inside the capsid. C. The envelope is obtained from the host cell when the virus buds from the plasma membrane. D. The envelope is obtained from the host cell upon entry into the cell. E. The envelope is formed via the action of integrase.
What was the long-term effect of the introduction of myxoma virus to control rabbits in Australia?
a. The rabbits were all killed. b. Most rabbits became immune to the virus. c. The virus killed off some of the rabbit population but also infected kangaroos and wallabies. d. The virus became less virulent and the rabbits gained some immunity. e. The virus had no effect.
Which statement about agricultural diversity is true?
a. The loss of wild crop species hinders the development of new crop varieties. b. Wild crop seeds cannot be bred with existing varieties of crop seeds. c. Modern pesticides effectively kill pest species while protecting non-pest species. d. A single pest enemy species is more effective at pest control than multiple species.
Viruses are characterized by all of the following except
A. being specific to the hosts they infect. B. being acellular. C. being capable of independent reproduction. D. being found in every organism investigated so far.