The accompanying illustration shows one possible outcome of the random alignment of homologous chromosomes at
metaphase I. How many OTHER possible arrangements exist?
a. none
b. one
c. two
d. seven
e. eight
ANSWER: d
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Which of the following is not a defining trait of the phylum Chordata?
A. notochord B. dorsal hollow nerve cord C. pharyngeal slits D. post anal tail E. protostome development
A scientist looking through a microscope at a piece of shoulder muscle would see which of the following features?
A. striated with unbranched fibers B. striated with branched fibers C. nonstriated with unbranched fibers D. nonstriated with branched fibers E. None of the answers for this question are correct.
Technology systems
A) contain interrelated transportation, production, and energy technologies. B) tend to last for several decades. C) are eventually replaced by more sophisticated systems. D) contain interrelated transportation, production, and energy technologies, tend to last for several decades, and are eventually replaced by more sophisticated systems.
Recent studies on plants with mutations in certain cytokinin receptors show that these plants have strongly enhanced root systems. These data suggest that while cytokinins have a positive role in shoot growth, they may actually work to inhibit root growth. Do you think these mutant plants could still be used in plant tissue culture?
A. Yes, but they may develop bigger roots. B. No, because they can't form a callus. C. Yes, but they may have smaller roots. D. No, because they won't be able to respond to auxin.