A prokaryotic cell has which of the following?
A. centrioles
B. lysosomes
C. Plasma membrane
D. mitochondria
E. Endoplasmic reticulum
Ans: C. Plasma membrane
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A human blastomere is _____
A) an embryonic cell that is smaller than the ovum B) an embryonic structure that includes a fluid-filled cavity C) that part of the acrosome that opens the egg's membrane D) a component of the zona pellucida E) a cell that contains a (degenerating) second polar body
Photoreceptors are sensitive to what general type of sensory information?
A. tactile B. sound C. temperature D. chemicals in the animal's environment E. electromagnetic radiation
Heat shock proteins are
A) only actively synthesized during conditions of intense heat. B) only observed in prokaryotic cells. C) molecular chaperones synthesized during times of cellular stress. D) unique to every organism. E) present only in certain organelles.
The cyanobacterium Trichodesmium ________.
A. fixes a significant amount of N2 in oceanic environments B. is a spherical organism C. uses nitrite as a source of nitrogen D. fixes N2 during the day