Aseptic means
A. sterile.
B. free of all microbes.
C. clean.
D. sanitized.
E. free of pathogens.
Answer: E
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a. five b. ten c. several dozen d. several hundred e. several thousand
Why must T cell activation take place outside the thymus?
A. An activated T cell could destroy the other maturing T cells. B. An activated T cell could then destroy the thymus gland itself. C. Many T cells are self-reactive and must be eliminated in the thymus before any possibility of activation. D. Other cell types might be accidentally activated in the thymus.
A color-blind man has a son who is also color blind. The son inherited the condition from his
____________________. Fill in the blank(s) with the appropriate word(s).
Which statement best describes the panspermia hypothesis?
a. Life on Earth could have started abiotically. b. Life on Earth could have started biotically. c. Different forms of life were present in outer space but these may not have seeded early Earth. d. Very simple forms of li