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.

Biology & Microbiology

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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.

Biology & Microbiology

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

Biology & Microbiology

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

Biology & Microbiology

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).

Biology & Microbiology