The most important kind of selection acting on a well-adapted population in a relatively constant environment is:
A) stabilizing. B) directional. C) catastrophic. D) disruptive.
Answer: A
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If a cell has the same concentration of dissolved molecules as its outside environment, the cell's condition is referred to as being
A. isotonic. B. hypertonic. C. hypotonic. D. hydrophobic. E. hydrophilic.
Trisomy 8 usually leads to early miscarriage of a fetus. However, adult individuals have been found with cells that have three copies of chromosome 8 in them. How can this be?
A. The trisomic 8 adults likely have a mosaic region with trisomy 8 B. The trisomic cells underwent complete nondisjunction. C. The trisomic cells underwent a meiotic nondisjunction. D. This individual must be triploid.
The scientist given credit for devising the two-word scientific naming system is
A. Carolus Linnaeus. B. Charles Darwin. C. Gregor Mendel. D. Aristotle. E. Louis Pasteur.
The antibiotic penicillin inhibits the ability of bacteria to:
A) copy DNA. B) synthesize protein. C) make cell walls. D) undergo respiration.