How is phagocytosis in the immune system different from protozoan phagocytosis?

a. There is no difference between the two.
b. Protozoan phagocytosis is used to fight infection; phagocytosis by immune cells is used to feed the cells.
c. Protozoan phagocytosis is used for feeding; phagocytosis by immune cells is used to fight infection.


Ans: c. Protozoan phagocytosis is used for feeding; phagocytosis by immune cells is used to fight infection.

Biology & Microbiology

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When complexing with histones, the DNA phosphodiester backbone is in close proximity to:

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Biology & Microbiology

Nucleic acid blotting is widely used in recombinant DNA technology. In a Southern blot, one generally ________

A) hybridizes filter-bound DNA with a DNA probe B) ligates DNA with DNA ligase C) hybridizes filter-bound RNA with a DNA probe D) cleaves RNA with restriction endonucleases E) examines amino acid substitutions with radioactive probes

Biology & Microbiology

Which of the following levels of organization includes all of the others?

A. Population B. Ecosystem C. Community D. Organism E. Habitat

Biology & Microbiology

To demonstrate evolution by natural selection, all of the following conditions must be satisfied EXCEPT

a) variation for a trait b) heritability of a trait c) differential reproductive success d) low environmental variation e) all of the above are necessary for evolution by natural selection

Biology & Microbiology