The image in the accompanying figure is an example of a(n) ____
a. random coil
b. double helix
c. b sheet
d. a helix
e. b polysaccharide
ANSWER: c
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Following the attachment and invasion of a microorganism, in order to be classified as a disease the microorganism must be capable of:
a. causing inflammation and tissue destruc-tion. b. creating pain and requiring antibiotic treatment. c. multiplication and dissemination to deeper tissues. d. killing the resident microbiota.
Settlers to the United States found between
____ and ____ passenger pigeons. They are extinct today. a. 15,000?25,000 b. 3?5 billion c. 50?100 million d. none; they are native to Europe e. none of these
Typically, methylation of nucleosome N-terminal tails leads to __________
A) removal of the protein components of the chromatin from the DNA B) relaxed packaging of the chromatin and increased transcription C) tighter packaging of the chromatin and reduced transcription D) increased amounts of euchromatin relative to heterochromatin E) activation of topoisomerase
Related to the amoebas, these usually unicellular creatures are able to aggregate under times of stress.
A. cellular slime molds B. water molds C. ciliates D. plasmodial slime molds