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USABO Practice Questions & Answers Solved 100% Correct!!
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USABO Practice Questions & Answers Solved 100% Correct!!
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Name: Score:184 Multiple choice questions
Term 1 of 184
Which of the following statements is true of territorial behavior?
"Owners" defend mainly against conspecifics
steroid hormones
cell wall, dna, and plasma membrane
contests are seldom "ritualized"
Term 2 of 184
An antidiuretic hormone:
enhances potassium secretion in the loop of henle.
increases free-water transfer from the distal convoluted tubule and collecting duct to the
capillary blood.
decreases sodium reabsorption in the proximal tubule.
inhibits glucose reabsorption in the glomerulus.
Term 3 of 184
ATP is an important molecule in metabolism because it:
contains valuable nutrients.
has high-energy phosphate bonds.
maintaining ... increased
development of seeds.
,Term 4 of 184
The most phytoplankton in a lake would be found in which zone?
Benthic Zone
Littoral Zone
Profundal Zone
Limnetic Zone
Term 5 of 184
Group hunting can favorably influence the ability to obtain different food resources and the
efficiency of a capture as a result of:
the megagametophyte of angiosperms
increased chance of capturing larger prey
decreased success when competing with other species
facilitated diffusion
Term 6 of 184
Use the cladogram below to answer the following question. Which group(s) represent(s) a
monophyletic taxon? (number 47 on 2004 exam)
A, B, C, D, E, F, and G
Only Group a
Groups E, F, and G only
Groups B, C, and d only
,Term 7 of 184
An investigator found 150 different diatom species in one mile of a stream. None of the species
comprised more than 5% of the total population. In a second observation twenty-five miles
downstream, there were only 20 different diatom species, with 2 species representing 80% of the
total population. What is the best explanation of these two observations?
Our oxidizing atmosphere is not conducive to spontaneous formation of complex
molecules
The megagametophyte of angiosperms
Organic wastes high in nitrates and phosphates entered the stream somewhere between
the two sampling stations
The nature of the stream bottom changed
Term 8 of 184
The photobiont of a lichen is most likely to be:
red algae or brown algae
bryophytes
green algae or cyanobacteria
photosynthetic symbiont
Term 9 of 184
A red pigment is extracted from a marine alga. Which best supports the hypothesis that the
pigment is involved in photosynthesis? The red pigment:
has an absorption spectrum similar to the photosynthetic action spectrum for that same
marine alga
is toxic to marine animals that feed on the alga
is commonly found in deep-sea creatures
is used as a food coloring in the food industry
, Term 10 of 184
The presence of a vertebral column is with respect to all vertebrates [first term], but is with
respect to all chordates [second term].
ecological isolation
analogous; derived
primitive; derived
analogous; homologous
Term 11 of 184
Integral transmembrane proteins are proteins imbedded in the cell membrane. Which of the
following amino acids would you MOST expect to find in the transmembrane region of such
proteins?
Pyruvate
Tryptophan
Phenylalanine
Tyrosine
Term 12 of 184
During human development, which process leads to the formation of three germ layers?
neurulation
fertilization
organogenesis
gastrulation
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