26. Which of the following are obligate intracellular parasites?

A. Chlamydia
B. Viruses
C. Rickettsia
D. All of these

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27. Viruses can be purified based on their size and density by using

A. gradient centrifugation
B. differential centrifugation
C. precipitation
D. none of these

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28. The extracellular phage number increases until a constant titer at the end of the multiplication cycle. This time interval is termed as

A. eclipse period
B. rise period
C. latent period
D. burst size

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