A short-lived, highly reactive, uncharged molecule containing a single unpaired electron in the outermost shell is known as a(n):
a) ion.
b) catabolite.
c) free radical.
d) point mutation.
Ans: c) free radical.
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An example of a selective medium for gram-positive organisms is:
a. MacConkey agar. b. blood agar. c. colistin and nalidixic acid. d. thioglycollate broth.
Which of the following represents a consequence of the human effort to increase the carrying capacity of the Earth?
a. pharmaceutical pollution b. global climate change c. acceleration of technology d. returning to coal burning technology
Fireflies use pheromones to communicate with each other at night because it increases the chance the receiver will get the message.
Answer the following statement true (T) or false (F)
Four of the following describe a bilaterally symmetrical animal. Which one is the exception?
A. It has left and right sides. B. It usually displays cephalization. C. It produces mirror images regardless of the number of “cuts” through the central axis. D. It usually has a three layer body plan. E. It can be a deuterostome.