Plasma cells are activated by a(n)
A) antigen.
B) T cell.
C) B cell.
D) memory cell.
E) APC.
A
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Anchoring organs in plants that absorb water and nutrients are referred to as ____
a. stems b. leaves c. roots d. thalli e. tracheids
Which of the following is a characteristic of bogs?
a. low rate of percolation b. high rate of decomposition c. high level of nitrogen d. low amount of vegetation
Why is the random assignment of individuals to experimental and control groups important for an experiment?
A) It ensures that bias has been completely eliminated from the experiment. B) It ensures that the results of the experiment will be statistically significant. C) It ensures that the sampling error will have no effect on the results of the experiment. D) It ensures that each group will better represent the population as a whole.
Connective tissue
A. receives, generates, and conducts electrical signals throughout the body. B. forms continuous sheets that line body surfaces. C. is rich in extracellular matrix. D. generates force that facilitates movement. E. is composed of cells held together by tight junctions.