Pheromones are used primarily for
a. signaling target cells in the vicinity of the
secreting cells.
b. stimulating transmitter release at certain
synapses.
c. integrating social behavior in a population.
d. causing a response in a part of the body some
distance from the site of secretion.
e. all of these, depending on the species.
Answer: c
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Which of the following is considered an accessory digestive structure?
a. mouth b. stomach c. small intestines d. large intestines e. liver
Which of the following allows groups of skeletal muscle cells to perform coordinated contractions? (2 points)
a. Their sarcolemma is fused to the tendons, allowing them to function without continual nerve stimulation. b. Their cells are branched and joined end to end, allowing them to function without continual nerve stimulation. c. They contain a complex network of striations, allowing more efficient cell-to-cell communication d. They are connected into multinucleate tissues, allowing more efficient cell-to-cell communication.
Imagine that a Toll-like receptor (TLR) gene has duplicated and mutated, creating a leucine-rich region binding pocket that can now bind to the hemagglutinin protein in the envelope of influenza virus. What do you predict will happen to this novel gene?
A. It will be selected for and over evolutionary time will become an even better receptor for HA protein. B. It will continue to mutate, perhaps changing to bind other proteins or becoming deleted. C. It will spread from species to species. D. It will undergo VDJ rearrangement.
Which statement reflects the correct order in the synthesis of triacylglycerol?
A. Glycerol 3-phosphate ? diacylglycerol ? phosphatidic acid ? dihydroxyacetone phosphate ? triacylglycerol B. Diacylglycerol ? glycerol 3-phosphate ? phosphatidic acid ? dihydroxyacetone phosphate ? triacylglycerol C. Dihydroxyacetone phosphate ? glycerol 3-phosphate ? phosphatidic acid ? diacylglycerol ? triacylglycerol D. Phosphatidic acid ? glycerol 3-phosphate ? dihydroxyacetone phosphate ? diacylglycerol ? triacylglycerol