Why are most autotrophs referred to as the producers of the biosphere?
What will be an ideal response?
Answer: They are the ultimate sources of organic compounds for all nonautotrophic organisms.
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Which of the following is a cure for mumps?
A) a vaccine B) an antibiotic C) host antibodies D) an antiviral
Three genes (X, Y, and Z) are in the same region of a bacterial chromosome. To determine the order of these genes, you infect X?Y?Z? cells with a lysate from wild-type cells infected with a generalized transducing phage. When X+ cells are selected, 70% of cells are also Y+ and 5% of cells are Z+. When Y+ cells are selected, 68% of cells are also X+ and 1% are Z+. What is the relative arrangement of the three genes?
A) Z is in the middle, but closer to X. B) Y is in the middle, but closer to Z. C) X is in the middle, but closer to Y. D) X is in the middle, but closer to Z.
Approximately, how many varieties of edible
apples existed in the days of Johnny Appleseed?
a. 6 b. 16 c. 160 d. 1600 e. 16,000
A tree in your backyard is home to robins, squirrels, beetles, and lichens. Together all these organisms compose a/an:
A) niche. B) biosphere. C) community. D) organism. E) population.