Morphological or molecular characters shared by members of a clade are called ______
A) common ancestors
B) paraphyletic groups
C) homoplasys
D) monophyletic groups
E) synapomorphies
E
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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.
Which of the following statements is incorrect regarding DNA and RNA?
A. One of the bases is different. B. DNA is double stranded, and RNA is a single strand. C. They each contain a slightly different sugar molecule. D. All of the above are correct.
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
The electron transfer chain is located
a. on the inner membrane of the mitochondria. b. on the inner membrane of the chloroplasts. c. in the fluid part of the chloroplast. d. throughout the cytoplasm of the cell. e. on the plasma membrane of eukaryotes