How does plating efficiency affect the number of plaque-forming units? How is plating efficiency calculated?
What will be an ideal response?
Answer: The issue of plating efficiency is that not every virus will be infective or able to lyse the host in the medium. Consequently, the number of plaques observed is expected to be less than the actual number of viral particles in the culture. The plating efficiency is therefore required when counting plaque-forming units per volume plated to calculate the actual viral concentration (or titer). Plating efficiency is calculated by comparing the number of plaques observed to the number of viral particles observed with an electron microscope in the same culture.
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Host ________ is the process by which some cells are capable of degrading an exogenote.
Fill in the blank(s) with the appropriate word(s).
During contraction,
a. cross-bridges of muscle filaments are broken and reformed. b. ATP is used to break cross-bridges. c. muscle cells use glucose derived from glycogen as an energy source. d. glycogen depletion may lead to muscle fatigue. e. all of these occur.
How does an insect see the world, as many separate images or as a single image?
What will be an ideal response?
Soaps are classified as disinfectants
a. true b. false