Which of the following statements regarding an inactivated vaccine is FALSE?
A. It can be produced with deactivated whole microorganisms.
B. It can be produced from antigenic fragments of a pathogen.
C. It is safer than an attenuated vaccine.
D. It is made from mutated forms of the pathogen.
E. It is made from pathogens that cannot replicate.
Answer: D
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Winogradsky columns are used primarily for enrichment of
A) aerobic cultures, although occasionally anaerobes do appear. B) anaerobic cultures, although occasionally aerobes do appear. C) aerobes, anaerobes, and phototrophs. D) phototrophs, although occasionally heterotrophs do appear.
What are the major antigenic barriers for tissue transplantation from one individual to another?
What will be an ideal response?
Which one of the following is a signal that induces multicellularity of choanoflagellates?
A. the presence of predators in the environment B. the presence of the preferred prey/food source in the environment C. the developmental signal molecules that induce differentiation D. the cell migrations that take place in the developmental phases of growth
Answer the following statements true (T) or false (F)
1.Mycologists classify fungi into five phyla based on their sexual structures. 2.Ascomycetes are fungi that cause disease and are not beneficial to humans in any way. 3.A dikaryotic stage is common in the life cycle of many plants, protozoans, and fungi. 4.Salt and sugar in high enough concentrations retard mold growth by limiting the ability of these organisms to take up water by osmosis. 5.Some animals are autotrophs.