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

Biology & Microbiology

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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

Biology & Microbiology

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

Biology & Microbiology

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.

Biology & Microbiology

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).

Biology & Microbiology