The conversion of gaseous nitrogen (N2) to the ammonium ion (NH4+) occurs during
A. denitrification.
B. photosynthesis.
C. nitrogen fixation.
D. ammonification.
E. nitrification.
Answer: C
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The cell plate is composed of
a. microfilaments. b. the cytoplasmic membrane. c. vesicles with wall-building materials. d. Golgi bodies. e. microtubules
It is believed that war vessels in World War II carried the brown tree snake to the island of _. This invasive predator caused extinction of many local populations of birds and small reptiles.
A. Ceylon B. Madagascar C. Guam D. Cuba E. Puerto Rico
Voltage-gated channels contain charged protein domains, which are sensitive to changes in membrane potential. By responding to a threshold in the membrane potential, these voltage sensors trigger the opening of the channels
Which of the following best describes the behavior of a population of channels exposed to such a threshold? (a) Some channels remain closed and some open completely. (b) All channels open completely. (c) All channels open partly, to the same degree. (d) All channels open partly, each to a different degree.
Both energy and chemicals cycle through an ecosystem.
Answer the following statement true (T) or false (F)