Cells with a short life span that circulate in blood and tissues and are usually the first cells on the scene of a bacterial invasion are called:
a. monocytes.
b. polymorphonuclear neutrophils.
c. lymphocytes.
d. macrophages.
B
All the cells listed are involved in the body's cellular responses to foreign particles, but neutro-phils are short-lived cells that circulate in blood and tissues.
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Captive breeding (Check all that apply)
_____ is a viable strategy whenever very few individuals of a species remain in the wild. _____ has had limited success restoring California condor populations in the western U.S. because of reduced genetic heterogeneity. _____ sometimes deals with low genetic variability and inbreeding. _____ is sometimes a part of efforts to restore ecosystems to a balanced, functional state. _____ successfully increased peregrine falcon populations.
Match the following items to the correct phrase.
_______1. Viruses that infect bacteria and cause the lytic cycle to occur. _______2. Term meaning complete viral particles. _______3. Are known to cause some plant diseases, but no animal diseases. _______4. Infectious protein molecules. _______5. Infectious molecules of RNA. _______6. Cause diseases such as Creutzfeldt-Jacob disease, “mad cow disease,” and “scrapie.” a. viroids b. virions c. prions d. temperate phages e. virulent phages
Which of the following is a potential risk of exotic species?
a) introduction of new diseases b) native species being outcompeted c) alteration of habitats d) all of these are potential risks
Proteins that need to be used in the cytosol are generally synthesized by free _________ in the cytosol.
Fill in the blank(s) with the appropriate word(s).