Given the information in this chapter, why do you suppose that the rabies virus attacks mammal nervous systems but not those of crocodiles?
What will be an ideal response?
The cells of the crocodile nervous system clearly have different receptors on their surfaces from those found on the cells of mammals. The molecules on the surface of the rabies virus would not fit into the receptors found on the surface of crocodile cells but would fit into those on the surface of mammal cells.
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How many recombination events result from cutting and pasting four DNA backbones?
a. four b. three c. two d. one
Gram-negative nitrogen-fixing bacteria found in association with plant roots are
A) alphaproteobacteria. B) betaproteobacteria. C) cyanobacteria. D) gammaproteobacteria. E) deeply branching bacteria.
Fermentation produces either ___ or ___
Fill in the blank(s) with the appropriate word(s).
Which of the following describes an organ?
a. groups of similar cells that perform specialized functions b. composed of at least two types of tissues c. structure that contains DNA d. a thin bilayer that separates individual cells