Compared to white muscle fibers, red muscle fibers ____
a. have fewer mitochondria
b. have less myoglobin
c. make more ATP by lactate fermentation
d. fatigue less easily
e. get most of their ATP from creatine phosphate
ANSWER: d
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What percentage of water is reabsorbed by the proximal convoluted tubule by the time the filtrate leaves?
A. 75% B. 0% C. 10% D. 25% E. 50%
Assimilation efficiency is the ratio of ____
a. energy content of food consumed to the energy content of food available b. energy absorbed from consumed food to the food’s total energy content c. energy content of new tissue produced to the energy assimilated from food d. net productivity at one trophic level to the trophic level below e. producers to consumers
Roots obtain cations through cation exchange, where soil particles absorb ____ provided directly or
indirectly by the root, and thus release cations.
a. Cl? b. K+ c. H+ d. water e. CO2
Mutations of keratins in the ________ that resist tensile forces in the skin cause the blistering disease known as epidermolysis bullosa simplex
A) intermediate filaments B) microtubules C) microfilaments D) actin filaments E) crescentin filaments