You notice mayfly larvae trying to emerge from a stream being slowed down when they reach the surface. Why might this be?
A) Because of the surface tension of the water.
B) Because of the colder temperature at surface.
C) Because of less oxygen at the surface.
D) Because of higher flows at surface.
A
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Which of the following best describes the factors determining water potential of plant cells?
A. solute outside the cell B. solute inside the cell C. cell turgor pressure D. pressure at the cell wall-membrane interface E. All of these are true
The nucleus of the eukaryotic cell functions:
A. to store the cell's hereditary information B. to house the nucleolus C. as the command center for the cell D. All of the choices are correct.
The Red Queen hypothesis is named by paleontologist Leigh Van Valen for the Red Queen whom Alice meets in Lewis Carroll's Through the Looking-Glass. What is the analogy?
A. Species who are at the top of a hierarchy (queens) have more resources than those at the bottom (peasants) B. For two species that are in conflict, each species has to run (i.e., evolve) as fast as possible just to stay in the same place (survive) C. You have to outrun your competitors in order to "win" and become "queen"
The allele responsible for the Siamese coat-color pattern produces an unstable tyrosinase enzyme. This type of gene product is an example of what type of allele?
What will be an ideal response?