The movement of NH4
+ ions into a cell down an electrochemical gradient (where, when compared to
the outside of the cell, the inside of the cell has less NH4
+ ions) is best described as an example of
a. symport.
b. passive diffusion.
c. antiport.
d. facilitated diffusion.
e. active transport.
D
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Imagine that you have set up a genetic screen to identify E. coli mutants that cannot metabolize the amino acid tryptophan for energy. Beginning with a master plate containing many colonies, you prepare replica plates on medium with glucose or tryptophan as the only energy source. You would look for colonies that _____.
A) cannot grow on either type of media B) can grow on both types of media C) can grow only on the plates with tryptophan D) can grow only on the plates with glucose
Extensive horizontal gene transfer between domains greatly simplifies the construction of phylogenetic trees.
Answer the following statement true (T) or false (F)
Extant microorganisms are organisms from the fossil record that are no longer present on Earth today.
Answer the following statement true (T) or false (F)
Recent studies have demonstrated evolution in some populations over a span of time as short as ____
a. single years b. decades c. centuries d. thousands of years e. millions of years