What is the evolutionary significance of a flower that has large, brightly colored petals?
A) Such flowers produce only microspores or megaspores, not both.
B) In general, these are aquatic plants, and water aids in their pollination, regardless of color and odor.
C) Such plants are usually self-pollinators and do not rely on external factors for pollination.
D) The wind is a significant factor in pollination, especially because of the large petals.
E) These flowers attract pollinators that are animals.
E
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In a continuous culture system, the rate at which media is added and removed is called the ________ rate.
A. dilution B. pass-through C. flow-through D. chemostatic
How can the complementation test discriminate between two viruses that have a mutation in the same gene versus two viruses that have mutations in the same gene?
A. If the viruses have mutations in the same gene then, depending on the assay, a significant number of plaques will be produced or a significant number of plaques will have a wildtype phenotype. If the mutations are in the different genes few, if any, wild type plaques will be seen.. B. If the viruses have mutations in different genes then, depending on the assay, a significant number of plaques will be produced or a significant number of plaques will have a wildtype phenotype. If the mutations are in the same gene few, if any, wild type plaques will be seen C. If the mutations are in the same gene the complementation test will result in recombinant viruses that are wildtype but if the mutations are in different genes no recombinant viruses will be produced. D. If the mutations are in different genes the complementation test will result in recombinant viruses that are wildtype but if the mutations are in the same gene no recombinant viruses will be produced.
Clinicians should always be notified of "panic values," that is, potentially life-threatening results. An example of a panic value is a(n):
a. elevated thyroid level. b. positive urine culture. c. positive blood culture. d. elevated sodium level.
Explanations for mass extinction include all of the following except
1.collisions between the Earth and other bodies in the solar system. 2.continental movements. 3.adaptive radiation of new predator species in many lineages. 4.alterations in sea level. 5.habitat destruction.