The substance that typically provides rigidity to fungal cell walls, and is also found in the external skeletons of insects
and other arthropods, is called ____.
a. lignin
b. cellulose
c. starch
d. collagen
e. chitin
ANSWER: e
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Activation of the ________ G-protein results in the formation of focal adhesions and stress fibers.
Fill in the blank(s) with the appropriate word(s).
Cytoplasmic division in animal cells involves
all EXCEPT a. formation of a cell plate. b. a contractile ring mechanism. c. a deepening cleavage furrow. d. a ring of actin filaments under the plasma membrane at the equator. e. ATP.
RNA interference (RNAi) was first discovered in prokaryotes and is thought to have evolved as protection against certain types of viruses.
Answer the following statement true (T) or false (F)
Mucus traps pathogens that are later coughed or sneezed away. What form of body defense applies to this example?
A) first line of defense B) second line of defense C) third line of defense D) antibody-mediated immunity