One of the most extensive animal radiations is that of terrestrial arthropods (includes insects). They excrete uric acid as their form of nitrogenous waste
Why does this allow
them to conserve more water than a mammal with extensive kidney tubules for water
reabsorption?
A. The high solubility of uric acid allows the
excretory system to reabsorb water.
B. Uric acid levels stay high in the blood
maintaining a strong osmotic gradient, which
allows water to be reabsorbed.
C. After precipitation, uric acid no longer
influences osmolarity; water returns to the
hypertonic tissues.
D. After precipitation, uric acid no longer
influences osmolarity; water leaves the
hypertonic tissues.
C
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The K-T boundary is a layer present in strata worldwide that marks the boundary between the ________ periods, when ________
a. Proterozoic-Cambrian / oxygen accumulated in the atmosphere b. Cretaceous-Tertiary / an asteroid impact caused the extinction of the dinosaurs c. Triassic-Jurassic / dinosaurs appeared d. Devonian-Carboniferous / land tetrapods appeared
Which of the following is an inherited disorder in which skeletal muscle fibers break down?
a. sclerosis b. dystrophy c. atrophy d. sarcoma e. tetanus
The direction of an exergonic reaction can best be describe as moving:a
from higher to lower entropy.
b. from lower to higher free energy. c. from higher to lower free energy. d. from higher to lower absolute temperature. e. from lower to higher absolute temperature
Of the following sequences, which one reflects the best scientific knowledge about the succession of Homo species from the past until the present?
A. Homo sapiens ? Homo heidelbergensis ? Homo habilis ? Homo erectus B. Homo heidelbergensis ? Homo habilis ? Homo sapiens ? Homo erectus C. Homo heidelbergensis ? Homo sapiens ? Homo erectus ? Homo habilis D. Homo habilis ? Homo erectus ? Homo heidelbergensis ? Homo sapiens E. Homo habilis ? Homo heidelbergensis ? Homo erectus ? Homo sapiens