Which organism is a nonlactose-fermenter that oxidizes glucose and xylose and also morpholog-ically resembles colonies of Enterobacteriaceae?
a. CDC group Ic
b. O. anthropi
c. S. putrefaciens
d. A. xylosoxidans
B
Morphologically, O. anthropi resemble colonies of Enterobacteriaceae, only smaller, and is a nonlactose-fermenting organism.
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Cytokinesis in plants occurs as ________ and in animals as ________.
A) actin fibers pull the membrane inward until the two sides touch; the Golgi apparatus produces membrane-bound vesicles filled with materials to make the cell wall B) the Golgi apparatus produces membrane-bound vesicles filled with materials to make the cell wall; actin fibers pull the membrane inward until the two sides touch C) the centrosome produces membrane-bound vesicles filled with materials to make the cell wall; the Golgi apparatus produces actin fibers to pull the membrane inward until the two sides touch D) actin fibers interact to make the cell wall; the cleavage furrow pulls the membrane inward until the two sides touch E) the Golgi apparatus produces a cleavage furrow; actin fibers pull the membrane inward until the two sides touch
Our current view of membrane structure is based on the fluid mosaic model, proposed by ____ in 1972
a. Frye and Edidin b. Watson and Crick c. Singer and Goldstein d. S. Singer and G. Nicolson e. Brown and Goldstein
What provides the greatest visual acuity (the precise
discrimination between adjacent points in space) in the human eye? a. photoreceptors in the sclera b. photoreceptors in the fovea c. protein filaments in the lens d. photoreceptors in the optic nerve e. none of these
Which of the following statements concerning radiolarians is FALSE?
a. They lack shells. b. They are actinopods. c. They are rhizarians. d. They have axopods. e. They are important constituents of plankton.