The marine multicellular protists including the larger brown algae belong to the
A. euglenoids.
B. Choanoflagellida.
C. Stramenopiles.
D. dinoflagellates.
E. foraminifera.
Answer: C
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Four of the five answers listed below are
events occurring during mitosis. Select the EXCEPTION.
a. crossing over b. division of centromeres c. chromosomes line up at the cellular equator d. attachment of spindle microtubules to centromeres e. migration of chromosomes to opposite ends of the cell
The first organisms to be bioengineered were
a. bacteria. b. viruses. c. fungi. d. protozoans. e. algae.
A population of T cells was stimulated to proliferate in response to a particular antigen. A sample of 1000 stimulated cells was analyzed by fluorescence-activated cell sorting (FACS) for total DNA content
Of the 1000 cells, 400 had a 2n amount of DNA, 200 had a 4n amount of DNA, and the remaining 400 cells had between a 2n and 4n amount of DNA. Additional immunofluorescence analysis revealed that 200 of the cells were in various stages of M phase and that M phase lasted 2 hours. What is the total length of the cell cycle? A) 8 hours B) 12 hours C) 18 hours D) 20 hours E) 24 hours
Which one of the following ecosystems is most likely to show an inverted biomass pyramid but a normal energy pyramid?
A. Tropical forest B. Open ocean C. Grassland D. Desert E. Intertidal