A beautiful wood desk you may do your homework on was once a living tree, but after being cut down its tissues died. Now, it only exhibits what property of life?
A. Homeostasis
B. Metabolism
C. Organization
D. Sensitivity
Answer: C
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Ionizing radiation that can harm living cells does so by
a. creating chemical compounds. b. lysing lysosomes. c. removing electrons from atoms to create positive ions. d. creating buffers. e. destroying buffers.
The fight or flight response is triggered by the _____ nervous system.
A. sympathetic B. synthetic C. GAS D. parasympathetic
Saber teeth found in different groups of extinct carnivorous mammals are considered ________ structures, as the fossil record shows that saber teeth evolved independently among the groups.
Fill in the blank(s) with the appropriate word(s).
Why must T cell activation take place outside the thymus?
A. An activated T cell could destroy the other maturing T cells. B. Many T cells are self-reactive and must be eliminated in the thymus before any possibility of activation. C. An activated T cell could then destroy the thymus gland itself. D. Other cell types might be accidentally activated in the thymus.