After all of the reactants in a solution have been consumed, what is the state of the solution?
a. transition
b. exergonic
c. equilibrium
d. endergonic
c. equilibrium
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Which of the following is primarily responsible for limiting the number of trophic levels in most ecosystems?
A) Many primary and higher-order consumers are opportunistic feeders. B) Decomposers compete with higher-order consumers for nutrients and energy. C) Nutrient cycles involve both abiotic and biotic components of ecosystems. D) Nutrient cycling rates tend to be limited by decomposition. E) Energy transfer between trophic levels is usually less than 20 percent efficient.
Substances that can readily pass through the cell membrane are chemically ________ in nature.
Fill in the blank(s) with the appropriate word(s).
In the comparison of a DNA molecule to a twisted ladder, the rungs (footholds) of the ladder are
A) nitrogenous bases linked together. B) nitrogenous bases linked to phosphate. C) deoxyribose linked to sulfate. D) the backbones of the molecule. E) deoxyribose linked to phosphate.
In a process called (cytokinesis/hematopoiesis/hematocrit), blood stem cells located in the bone marrow produce the three types of formed elements found in the blood.
Fill in the blank(s) with the appropriate word(s).