When the concentration of glucose in the blood rises following digestion of a meal, what is the hormonal response?
A) Levels of both glucagon and insulin increase.
B) More glucagon is released.
C) More insulin is released.
D) Neither glucagon nor insulin is released.
Answer: C
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In a fetal pig, dorsal and ventral refer respectively to
(a) the head and tail regions of the body. (b) the tail and the head regions of the body. (c) the upper (back) portion and the lower (underside) portion of the body. (d) the lower (underside) portion and the upper (back) portion of the body.
Association of histone H1 with linker DNA is required to form ____
a. heterochromatin b. the 10-nm chromatin fiber c. nucleosomes d. the solenoid e. euchromatin
Molecules that are polar and attracted to water are ________; molecules that are nonpolar and therefore not attracted to water are ________
Fill in the blank(s) with correct word
A scientist isolates a mutant of a gated ion channel that transports ions into the cell in the presence of a particular chemical signal. She determines that the mutation causes the channel to remain open even in the absence of any chemical signal. She measures concentrations of the ion on either side of the membrane and finds that the concentration is higher inside the cell than outside at the beginning of the experiment. After an hour, she measures the concentrations again. What do you expect she will find?
A) The concentration of the ion has increased inside the cell after an hour. B) The concentration of ion inside the cell is equal to the concentration outside the cell. C) The concentration of the ion has become higher outside the cell than inside the cell after an hour. D) The concentrations of the ion inside and outside of the cell have remained constant. E) The ions have all diffused into the membrane.