The base of the detrital food chain is formed by
A) primary producers.
B) decomposers.
C) herbivores.
D) dead organic matter.
D
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The original three components of the cell theory are that all organisms
A. have DNA, DNA is the fundamental unit of life, and all cells come from preexisting cells. B. are made of one or more cells, the cell is the fundamental unit of life, and all cells come from preexisting cells. C. are made of one or more cells, the cell is the fundamental unit of life, and all cells have a nucleus. D. have DNA, are made of cells, and all cells produce proteins. E. are made of one or more cells, all cells contain DNA, and all cells come from preexisting cells.
To a person studying utilization of classroom
space on campus, the most useful data concerning students in a classroom would be expressed by the number of
a. total individuals. b. individuals per square meter. c. individuals per room. d. rooms per building. e. students of each age
In the central nervous systems, axons of several neurons traveling together are called ____
a. nuclei b. fibers c. bundles d. tracts e. filaments
Using a specific chemical, a cell biologist has blocked one type of channel-linked receptor in a lab rat's liver tissue. What was the likely mechanism of the chemical she used?
A. The chemical prohibits ions from entering the cell via active transport. B. The chemical prohibits binding of a ligand to the receptor. C. The chemical causes ions to move in the opposite direction of the ion gradient. D. The chemical prohibits second messenger signaling.