The structure of the angiosperm that supplies nutrients to the germinating seedling is the:
a. Endosperm
b. Fruit
c. Seed coat
d. Spore coat
e. Pollen grain
Answer: a. Endosperm
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In the current form of dideoxy DNA sequencing, the primer is unlabeled and each dideoxynucleotide is labeled with a different fluorescent marker. This method _____
A) eliminates the need to run sequencing reaction products on a gel B) allows a DNA sequence to be determined from four separate sequencing reactions, each run on a separate lane of a gel C) allows a DNA sequence to be determined from one sequencing reaction that is run on a single lane of a gel D) eliminates the need for sophisticated machines to read the output of each sequencing reaction
An illness outbreak occurs in New York City birds in the late 1990s. After a lengthy scientific investigation, the Centers for Disease Control (CDC) determine that the agent causing the birds to die is the West Nile virus
Outbreaks of this illness have been observed in several other countries in Asia and the Middle East across the last 50 years, but not in the United States. With this information, what would be the best categorization of this infectious agent/disease A. This is clearly a reemerging infection. It's been around for a long time, and it is reappearing in a susceptible population again. B. This is clearly a nosocomial infection. It's transmitted from animals to human beings in urban environments. C. This is clearly an emerging infection. It hasn't been around that long, and it has made a jump across continents into a new susceptible population. D. This is clearly not a concern to human beings--maybe it's emerging in animals, maybe it's reemerging, maybe it's nosomial. But who cares? It's only in birds.
Which of the following are associated with the process of stem nodulation?
A. Nod factors are not part of stem nodulation. B. A common bacterial species associated with stem nodulation is Bradyrhizobium. C. Bacteria enter through ruptures in the stem epidermal cells. D. All of these are associated with stem nodulation.
Which of the folllowing describes Proteobacteria in domain Bacteria?
A. phylum B. class C. species D. genus