Which of the following is an exogenous antigen?
A. a bacterium inside a cell
B. a virus inside a cell
C. a bacterium outside a cell
D. a non-infected human cell
E. the malaria parasite inside a red blood cell
Answer: C
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The nucleocapsid is composed of
A. DNA and RNA and protein. B. DNA or RNA and protein. C. protein located in the nucleus. D. nucleic acid in the ribosome.
A microbiologist inoculates Staphylococcus aureus into a culture medium. Following incubation, both Staphylococcus aureus and Staphylococcus epidermidis are determined to be growing in this culture. What is the most likely explanation?
A. The culture was contaminated. B. The culture medium was differential. C. The incubation temperature was incorrect. D. The microbiologist used too much inoculum. E. The culture medium was selective.
Which of the following statements regarding the Chlamydia life cycle is incorrect?
A. Elementary bodies differentiate into reticulate bodies in the cell nucleus. B. The elementary body is the infectious stage of Chlamydia. C. Elementary bodies are released from the host cell to continue the infectious cycle. D. Reticulate bodies multiple by binary fission.
What functional differences exist between various cyclins?
What will be an ideal response?