Leaf abscission is initiated and orchestrated by changing levels of the plant hormone ____
a. ethylene
b. cytokinin
c. auxin
d. abscisic acid
e. gibberellin
a
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A bone marrow aspirate is examined for the presence of parasites from a patient who has been traveling in Latin America for several months and who came in contact with a triatomid bug. Which parasite will most likely be identified?
a. Trypanosoma cruzi b. D. fragilis c. Fasciola hepatica d. Chilomastix mesnili
Missing links in the fossil record prevent scientists from determining evolutionary lineages until _____ are discovered
a. marine fossils b. homologous structures in related organisms c. partial fossils d. fossils showing intermediate body forms e. coprolites of related organisms
In a __________, water or some nutrient moves from an environmental reservoir, through organisms,
then back to the environment. Fill in the blank(s) with the appropriate word(s).
Human MN blood types illustrate the Hardy Weinberg principle because these blood type antigens are not subject to
inheritance. ______________ Indicate whether the statement is true or false.