What are the benefits and costs to animals that excrete uric acid?
What will be an ideal response?
ANSWER: Animals that excrete uric acid, birds and terrestrial reptiles, are able to conserve water by
excreting uric acid. Uric acid is an almost water-free form of nitrogenous waste excretion.
However, making uric acid requires more energy than making urea.
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If all of the tertiary consumers were removed from an environment, the associated food web (and thus the carbon cycle) would collapse
A. true B. false
After many years of testing, an hypothesis becomes accepted as a ____
a. fact b. prediction c. theory d. conclusion e. variable
Metaphase is characterized by _____
A) aligning of chromosomes on the equator B) splitting of the centromeres C) cytokinesis D) separation of sister chromatids
A signal peptidase
a. removes a signal sequence from a polypeptide chain after it passes through a channel into the rough ER. b. attaches a signal sequence to a growing polypeptide chain before it passes into the rough ER. c. attaches an acetyl group to the 5? end of a polypeptide after removal of the initial methionine. d. removes the initial methionine from a polypeptide chain.