Which of the following is the correct order of the three major forms of nitrogenous waste listed from highest amount of water required for excretion to lowest amount of water required for excretion?
A. ammonia, urea, uric acid
B. ammonia, uric acid, urea
C. urea, ammonia, uric acid
D. urea, uric acid, ammonia
E. uric acid, urea, ammonia
A
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A chemoorganotroph and a chemolithotroph in the same environment would NOT compete for
A) oxygen. B) carbon. C) nitrogen. D) phosphorous.
Indels:
A. are mutations that arise due to large duplications of DNA. B. are caused by aberrant recombination or by template slippage during replication. C. are mutations in which one base pair is exchanged for another. D. are mutations that inactivate oncogenes, which cause cells to lose control of cell growth. E. are the result of replication errors.
What is the primary function of the transverse tubules?
A. Conduct action potentials from the surface of the muscle fiber to internal regions near myofibrils. B. Act as a channel for Ca2+ ions during excitation-contraction coupling. C. Form cross-bridges between actin and myosin during muscle contraction. D. Attach troponin to tropomyosin. E. Attach muscle fibers to skeletal elements to exert force.
Small changes in genes
a. disppear quickly b. gradually accumulate over time c. do not affect future generations d. prevent the next generation from developing