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1) which characteristic of pea plants were important in their selection as mendel's
research organism?
a. peas are easy to cultivate.
b. pea plants have a short generation time.
c. pea plants are self-pollinating but can be cross-fertilized easily.
d. many true-breeding varieties were available.
e. all of the above were important characteristics in mendel's selection.
2) in speciation which of the following is mismatched?
a. allopatric speciation-geographic isolation
b. sympatric speciation-geographic isolation
c. adaptive radiation-chance for new species to adapt to new habitats
d. post-zygotic isolation-hybrid offspring sterility
3) which of the following plant hormones was studied in the 1880s by charles and
francis darwin in experiments on phototropism?
a. abscisic acid
b. auxin
c. cytokinin
d. ethylene
e. gibberellin
4) some plants fail to produce chlorophyll, and this trait appears to be recessive. many
plants also self-pollinate. if we locate a pea plant that is heterozygous for this trait,
self-pollinate it and harvest seeds, what are the likely phenotypes of these seeds when
they germinate?
a. all will be green with chlorophyll since that is the dominant trait.
b. all will be white and lack chlorophyll since this is self-pollinated.
c. about one-half will be green and one-half white since that is the distribution of the
genes in the parents.
d. about one-fourth will be white and three-fourths green since it is similar to a
monohybrid cross between heterozygotes.
e. about one-fourth will be green and three-fourths white since it is similar to a
monohybrid cross between heterozygotes.
5) what are the potential symptoms of a person who is suffering from anaphylactic
shock?
a. the smooth muscle of the bronchi may constrict.
b. an increased dilation of the capillaries that can lower the blood pressure.
c. the release of a massive amount of histamine within the blood stream.
d. all of the above are potential symptoms of a person who is suffering from
anaphylactic shock.
6) while studying gull egg laying abilities a researcher noted that the birds laid an
average of 7 - 9eggs per clutch at the beginning of the study. after studying the
population for 15 generations the researcher noted that the birds now laid an average of
3- 4 eggs per clutch. what type of natural selection is occurring in the population of
gulls?
a. stabilizing
b. directional
c. disruptive
d. there is no selection occurring in this population.
correct
7) farmers sprayed leechi trees to suppress populations of scale insects. this also killed
the populations of a predatory lacewing that controlled the numbers of scales. soon the
spraying did no good, and the damage to the leechi from the scales was greater than
before spraying had occurred. few predatory lacewings exist in the trees now because
a. they, too, are insects so they are r-selected.
b. the scale insect was k-selected and the high number of young included a resistant
strain, while the predator was r-selected and will take longer to produce a resistant
variety.
c. the predator was r-selected and was therefore more susceptible to the spray.
d. the scale insect was r-selected and the high number of young included a resistant
strain; the predator was k-selected and will take longer to produce a resistant variety.
8) eukarya are believed to have diverged from the bacterial line of descent. the eukarya
are, therefore, more closely related to the bacteria than to the archaea.
9) which of the following statements best describes the jawless fishes?
a. ectotherms that have a bony skeleton.
b. ectotherms that have a smooth nonscaly skin.
c. endotherms that have a smooth nonscaly skin.
d. vertebrates that have scales and are ectothermic.
10) among the chordates, which features are unique to the tunicates?
a. leathery outer covering and an excurrent siphon
b. gill slits and bilateral symmetry
c. sexual reproduction and complete digestive system
d. sessile adult stage and aquatic lifestyle
e. leathery outer covering and sessile adult stage
11) which reproductive method would most likely lead to the greatest chance of success
in sea stars?
a. fragmentation
b. sexual reproduction
c. budding
d. none of these methods would be successful.
