Much of the world's coal reserves were formed from the buried remains of the dominant plants of the
Carboniferous period, which were ____.
a. bryophytes
b. seedless vascular plants
c. gymnosperms
d. angiosperms
e. gymnosperms and angiosperms
B
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In natural samples it is often difficult to differentiate live cells from dead cells or cells from nonliving matter
Indicate whether the statement is true or false.
In which demographic transitional stage is
India?
a. birth and death rates equally high; growth rate low b. death rate dropping fast; birth rate declining but slowly c. birth rates declining and approaching the death rates d. birth rate falling below death rate; population size decreasing e. death rate greatly exceeds birth rate; population is close to extinction
Answer questions 72-76 using the five groups listed below:a
halophiles b. cyanobacteria c. thermophiles d. proteobacteria e. methanogens D 72. These bacteria live in temperatures that are not usually conducive to life. M 73. These produce CH4. D 74. These bacteria can live in water of very high salt concentration. M 75. These can form heterocysts, valuable in nitrogen fixation. M 76. These are the most diverse monophyletic group of bacteria.
Which combination describes the plasma membrane?
A) Hydrophilic interior, hydrophobic exterior B) Hydrophilic interior and exterior C) Hydrophobic interior, hydrophilic exterior D) Hydrophobic interior and exterior