________ is directly produced from the transcription of a eukaryotic gene.
A. rRNA
B. pre-mRNA
C. mRNA
D. DNA
E. Protein
B. pre-mRNA
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Some cyanobacteria form ________, which are comprised of chains of bacterial cells that are in close contact with one another over a large area.
A. mycelia B. trichromes C. cell mats D. hypha
M. catarrhalis may be differentiated from gonococci and meningococci on the basis of its:
a. growth on blood agar at 35°C. b. growth on nutrient agar at 22°C. c. reduction of nitrite to nitrate. d. production of DNase.
Atmospheric CO2 was stable until
a. 10,000 years ago. b. World War I. c. World War II. d. the Industrial Revolution. e. 15 million years ago.
Sense receptors for “taste” are variously located
a. on insect legs. b. on octopus tentacles. c. on arthropod antennae. d. inside the mouth. e. in all of these places.