Which of the following statements does NOT describe a function of the cell walls of bacteria?
A. They maintain cell shape.
B. They prevent cross-fertilization.
C. They avoid disintegration in water with low concentrations of salt.
D. They protect against other bacteria.
E. They protect against viruses.
B. They prevent cross-fertilization.
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Birds that have long narrow bills used for eating bivalves and other invertebrates are:
a. gulls. b. pelicans. c. shore birds. d. tubenoses. e. skuas and jaegers.
Cardiac muscle cells are
a. involuntary. b. spindle-shaped. c. multinucleated. d. slow contracting. e. all of these
Recombinant DNA technology does not rely on which of the following enzymes?
A. DNA ligase B. RNA methylase C. Reverse transcriptase D. Restriction endonucleases
Evidence for the spiral nature of DNA came from ________
A) X-ray crystallography studies B) studies of disease-causing bacteria C) base rule studies D) bacteriophage studies