Unicellular and simple multicellular organisms isolate and eliminate waste materials by:
A. moving the wastes into a contractile
vacuole and eliminating them through
exocytosis.
B. filtering the wastes through specialized
filters in the plasma membrane and into the
extracellular space.
C. secreting wastes into excretory tubules
that connect to the outside of the cell.
D. filtering the wastes into a collecting tubule
and then selectively reabsorbing key solutes
prior to excretion.
E. All of the answer options are correct.
A
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A. oxygen B. nitrogen C. hydrogen D. carbon E. both nitrogen and carbon
A trait that is adaptive in one context and later turns out to have adaptive value in a rather different
context is called
a. paedomorphosis. b. anagenesis. c. cladogenesis. d. exaptation. e. endemic.
Which of the following is TRUE about energy
releasing chemical reactions?
a. they all require ATP to proceed. b. the activation energy required is greater than for energy requiring chemical reactions c. the reactants have more energy than the products d. the reactants have the same amount of energy as the products e. the reactants have less energy than the products
One-millionth of a meter is called a
A) centimeter. B) decimeter. C) micrometer. D) millimeter. E) nanometer.