Which of the following is a terpene?
A) testosterone
B) vitamin A
C) glycerol
D) estrogen
E) chitin
Answer: B
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Refer to the graph above. If the myelin fibers were stripped from this membrane, you would expect the action potential cycle to go
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A) much faster than depicted in the graph.
B) much faster than normal but not peak at 30 mV.
C) slower than depicted in the graph.
D) much slower than normal but peak much higher than 30 mV.
E) none of the above
Weeks of depressing work in the botany lab have culminated in yet another unsuccessful attempt to germinate your seeds. You are down to three batches of carefully packed seeds (you started with ten), and not one seedling to show for your work. Head in hands, you consult with a colleague from the California lab who sent the seeds earlier in the year. He makes a crazy recommendation but you brush it off because this colleague always has wild ideas. Later, in desperation, you decide to do it. Following his instructions carefully, you set fire to the seed packet and then put out the controlled blaze you have created. Six weeks later, you are carefully tending the seedlings and berating yourself for not having listened to him sooner. Of course! Which biome are these seeds from after all?
a. arctic tundra b. boreal forest c. chaparral d. temperate forest
Natural killer cells secrete ________, which forms pores in the membrane of infected or abnormal cells.
A) perforins B) cytokines C) pyrogens D) C-reactive protein E) interferon
A plant's lateral roots arise from the
a. endodermis b. epidermis c. phloem d. xylem e. pericycle