Leu" refers to a gene that governs a cell's ability to synthesize leucine from inorganic precursors. What does the designation "leu-" indicate?
a. that the bacterium is biologically inactive
b. that the allele is the mutant allele
c. that the bacterium is biologically active
d. that the allele is normal (i.e., wild type)
Answer: b. that the allele is the mutant allele
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Two different species are crossed and the second generation (F2) illustrates reduced fitness. This is an example of
____.
a. behavioral isolation b. gametic isolation c. hybrid breakdown d. crossing over e. hybrid sterility
Average height of college students increased throughout the 20th century because
A) more students attended college. B) more short students went into military service instead of college. C) nutrition improved greatly in that time. D) many mutations conferring great height occurred during that time period.
Which of the following characteristics is not associated with nemerteans?
A. presence of a true coelomic space, the rhynchocoel B. blood vessels C. a heart D. a proboscis E. a tube-within-a-tube body plan
Viruses possess genetic material comprised of DNA or __________.
A. RNA B. Plasmids C. ATP D. NADPH E. guanine