You inoculate a bacterium into three tubes of nutrient broth medium containing added salt: 0.5% NaCl, 5% NaCl, and 15% NaCl. After incubation, you notice significant turbidity in the 15% NaCl medium and modest turbidity in the 5% NaCl medium. There is no growth in the third tube. This organism would be termed ________.
A. halophilic
B. barophilic
C. haloduric
D. osmophobic
Answer: A
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“Germination” can refer to two different events:
A. the arrival of the pollen grain at the ovule, and the growth of the seedling from the seed. B. the development of the flower, and the growth of the seedling from the seed. C. the growth of the pollen tube into the embryo sac, and the growth of the seedling from the seed. D. the development of the fruit from the ovary, and the growth of the seedling from the seed.
Larrea tridenta is chemically defended against most herbivores and some are able to survive thousands of years
a. True b. False
Dental plaque is an example of
A) an endospore. B) a cell membrane. C) a biofilm. D) beneficial bacteria. E) bacterial flagella.
What will occur if a bacterial cell with a weakened or damaged cell wall is placed in pure water?
a. The cell will remain the same size b. The cell will swell and burst c. The cell will form endospores d. The cell will shrink e. The cell will form a new cell wall