How long does the spike of an action potential last?
a. one second
b. one millisecond
c. one microsecond
d. one half second
e. one nanosecond
B
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The nuclear envelope is perforated by _______________________
a. plasmodesmata b. gap junctions c. nuclear pores d. none of the above
The main source of energy in the normal human
diet is a. fats. b. carbohydrates. c. proteins. d. nucleotides. e. steroids.
When a person receives a sudden, large dose of ionizing radiation, all of the following might be expected to occur
EXCEPT ____. a. serious infections b. intestinal hemorrhages c. anemia d. wounds that do not heal e. increased antibody production
Insect growth and metamorphosis is controlled by the steroid hormones ecdysone and juvenile hormone (JH)
In insects like butterflies and moths that have a distinct larval (juvenile) and adult stage, the relative amount of JH determines whether the insect molts to the next juvenile stage or switches to become an adult. Can you think of a way to use this hormonal system to control caterpillar agricultural pests?