In plants, micronutrients _____
A) are required in relatively large amounts
B) are required only during germination of seeds
C) generally help in catalytic functions in the plant
D) are required only during flowering
Answer: C
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After mutagenesis, the nitrogen-fixing bacterium Sinorhizobium meliloti could no longer colonize Medicago truncatula plants. This inability to colonize was due to the absence of recognition by the host plant
Which of the following genes is most likely the site of the mutation in these bacteria? A) nitrogenase B) flavonoid-synthesizing enzyme C) Nod factors D) leghemoglobin E) peptidoglycans of the bacterial cell wall
If a pollen grain lands on the stigma of a plant that is not related to that plant then the following would happen:
A. The pollen grain would be too large or too small to enter the stigma. B. The pollen would likely not attach to the stigma. C. The pollen grain would be unable to grow through the stigma. D. The pollen grain would be unable to form sperm nuclei. E. The pollen grain would be ejected from the stigma.
Industrial melanism is a term
A. explaining that the darker moths have higher mutation rates because of industrialization. B. describing the widespread implementation of pollution controls. C. describing the color change induced by living in industrialized areas. D. describing the evolutionary process in which initially light-colored organisms become dark as a result of natural selection. E. explaining that the darker moths having higher reproductive success because of their pigmentation.
The disease that decimated the potato crop in 19th century Ireland was a
a. bacterium. b. protist. c. virus. d. fungus. e. plasmodium.