A number of generalizations can be made about the organization of protein-coding genes in bacterial chromosomes. First, the gene density is very high, averaging about ________
Fill in the blank(s) with correct word
one gene per kilobase pair of DNA
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Which group produces a toxin somewhat similar to that produced by Shigella dysenteriae?
A. enterotoxigenic B. enteroinvasive C. enteropathogenic D. enterohemorrhagic E. All of the choices are correct.
The procedure developed by the Chinese to protect against smallpox was called
A. Oriental poxination. B. humoral immunity. C. variolation. D. naturally acquired immunity.
What is the function of the synaptonemal complex presently thought to be?
a) it prevents the breakage of the DNA double helix at the wrong place b) it serves to initiate genetic recombination c) it assures that the DNA double helix breaks at exactly the right place d) it functions primarily as a scaffold to allow interacting chromatids to complete crossover activities e) it maintains RNA in association with the chromosomes
What structures regulate blood flow into capillary beds?
A) Peyer's patches B) venous valves C) postcapillary sphincters D) precapillary sphincters