You have isolated a cell which contains murein. What other structure(s) can you safely assume this cell has?
A. a cell membrane
B. all of the above
C. a plasmid
D. a pili
E. a mitochondrion
Ans: A. a cell membrane
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Organisms that reproduce repeatedly are said to be
A. semelparous. B. cohorts. C. iteroparous. D. demographic. E. survivors.
Before nitrogenous wastes are excreted in
urine, they are converted first to ___ and then to ___.
a. urea--ammonia b. ammonia--urea c. glycogen--monosaccharides d. glycerin--fatty acids e. glyerin--urea
Arrange the steps of an allergic reaction in the proper order
1) allergic symptoms appear 2) allergin binds with IgE 3) IgE combines with mast cell receptors 4) mast cell releases histamine 5) plasma cells sensitized a. 5 ? 3 ? 2 ? 4 ? 1 b. 1 ? 5 ? 2 ? 4 ? 3 c. 5 ? 2 ? 4 ? 3 ? 1 d. 1 ? 4 ? 5 ? 2 ? 3 e. 4 ? 5 ? 2 ? 3 ? 1
Which organism is used to make Swiss cheese?
A. Saccharomyces cerevisiae B. Spirulina C. Leuconostoc mesenteroides D. Streptococcus lactis and Lactobacillus E. Propionibacterium