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.

Biology & Microbiology

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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.

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Cardiac muscle cells are

a. involuntary. b. spindle-shaped. c. multinucleated. d. slow contracting. e. all of these

Biology & Microbiology

Recombinant DNA technology does not rely on which of the following enzymes?

A. DNA ligase B. RNA methylase C. Reverse transcriptase D. Restriction endonucleases

Biology & Microbiology

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

Biology & Microbiology