Most animals fall into one of how many phyla?
A) 100
B) 35
C) 9
D) 5
C
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Scientists develop a chemical that binds to molecules that make quorum sensing possible, rendering those molecules non-functional. If this chemical is incorporated into a mouthwash, how would it affect the community of bacteria that cause dental plaque?
A. Their negative effects would be reduced because they will no longer be able to produce mucilage and stick to teeth. B. Their negative effects would be reduced because they will no longer be able to produce the acid that damages teeth. C. Their negative effects would be increased because it will cause them to produce mucilage, allowing them to stick to teeth. D. Their negative effects would be increased because it will cause them to produce the acid that damages teeth. E. It would have no effect because they will still be able to form a biofilm and secrete the acid that damages teeth.
All of the following are nonspecific defense mechanisms EXCEPT
a. acid secretions of the stomach. b. inflammation. c. antibodies. d. mucus in the respiratory tract. e. skin.
Which of the following is least likely to be preserved as a fossil?
A. an organ like an eye or lung B. a bone or shell C. an organism that died on land D. a complete large organism E. a leaf or stem
Which of the following is NOT an event in cell
division in animals?
a. contractile rings wrap around the cell’s middle b. cleavage furrow forms c. cell pinches into d. a cell plate partitions the cytoplasm e. all of these ARE events in cell division in animals