Toxic elements such as mercury and arsenic are
found in the human body because
a. of contamination from the environment.
b. trace amounts of these elements have vital
biological functions.
c. they are needed to kill bacteria.
d. they may be ingested with food but inactivated
by cells.
e. in small amounts they are biologically inactive
and tolerated by cells.
Answer: b
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In the case of temperature regulation, an example of an effector is
(a) a receptor in the brain. (b) a center in the brain. (c) a shivering skeletal muscle. (d) none of the above.
When would a microbiologist use thioglycolate?
A) when making complex media B) when storing differential plates C) when making defined media D) when storing selective plates E) when storing plates anaerobically
Solar energy is the same thing as heat energy.
Answer the following statement true (T) or false (F)
Isoetes is the only species of (living) lycophytes that contains ____
Fill in the blank with the appropriate word.