Pollen comes from the
A. carpel.
B. petal.
C. stigma.
D. anther.
E. style.
D. anther.
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The spermatid is cell number
a. 2. b. 3. c. 4. d. 5. e. 6.
Streptomyces are aerobic soil bacteria that produce over two-thirds of our antibiotics. Why might a bacterium produce antibiotics?
A. to kill competing bacteria of the same species B. to protect itself from a host immune system C. to kill viruses that may try to infect it D. to allow it to break down the cell walls of plants E. to kill competing bacteria of different species
The main function of salivary mucus is to
a. break down starch. b. mechanically breakup food materials. c. make the food particles sticky. d. hydrate dry food particles. e. do more than one of these
Which of the following is/are true about natural selection?
A. It assures the survival of every fit individual. B. It acts on genotypes rather than phenotypes. C. It always selects for more complex forms. D. On average, it favors the survival of individuals that have adaptive characteristics. E. All of the answer choices are correct.