A linear depiction of energy flow in an ecosystem is a(n):
a. food web.
b. food chain.
c. trophic web.
d. ecological pyramid.
e. pyramid of numbers.
b
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A serious limitation of using a retrovirus as a vector for gene therapy is that
A) the retrovirus may insert into a proto-oncogene, causing cancer. B) a genetically modified retrovirus causes AIDS. C) it causes ADA accumulation. D) reverse transcriptase will not work in human cells.
Which statement is true of Planaria?
a. They have a well-developed circulatory system. b. They have a mouth located in their anterior end. c. They expel wastes via the action of ciliated flame cells. d. They contain a primitive, ladder-like skeletal system.
The word integument is derived from the word for
a. protection. b. support. c. covering. d. contraction. e. resistance
Which of the following is TRUE about the cholesterol associated with membranes?
a) it makes the cell membrane fluid at room temperature b) it is oriented with the small hydroxyl group embedded in the lipid bilayer and the remainder of the molecule toward the membrane surface c) it interferes with the movements of fatty acid tails of the phospholipids d) all of the choices are correct