One can inject dyes of different sizes into a liver cell and determine those molecules that can readily pass through gap junctions. What sized molecules can pass through gap junctions?
A. <1,000 Daltons
B. >1,000 Daltons, but <1,500 Daltons
C. >1,500 Daltons, but <5,000 Daltons
D. >5,000 Daltons, but <10,000 Daltons
E. >10,000 Daltons
A. <1,000 Daltons
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A positive test was observed on a serum sample that resulted in the formation of a fine precipi-tate on a reaction card. The most likely organism serologically identified is:
a. Chlamydia trachomatis. b. Bacillus anthracis. c. Treponema pallidum. d. Toxoplasma gondii.
Glacial kettleholes, lava flows, and sand dunes are similar in that they support which of the following types of succession?
A) primary B) secondary C) tertiary D) quaternary
The major damage caused by Neisseria meningitidis is a result of
A) its invasion into the central nervous system. B) its presence in the respiratory tract of 40% of healthy individuals. C) its ability to be transmitted by droplets among people who live in close contact. D) the release of lipid A into the tissues, triggering severe inflammation and DIC. E) the fact that it can survive in cells after phagocytosis.
Identify the polyphyletic group.
A. Bacteria B. Chloroplasts C. Eukarya D. Protists E. Archaea