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.
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When complexing with histones, the DNA phosphodiester backbone is in close proximity to:
A. the histone fold, two ? helices connected by two short links, this motif being found within H1, H2A, H2B, H3, and H4 B. the histone fold, two ? helices connected by two short links, this motif being found within H2A, H2B, H3, and H4 C. the histone fold, three ? helices connected by two short links, this motif being found within H1, H2A, H2B, H3, and H4 D. the histone fold, three ? helices connected by two short links, this motif being found within H2A, H2B, H3, and H4
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
Which of the following levels of organization includes all of the others?
A. Population B. Ecosystem C. Community D. Organism E. Habitat
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