A fat cell responds to the presence of the hormone epinephrine by increasing cytosolic cyclic AMP production, which leads to the catabolism of both glycogen and fat. What is the most likely explanation for this phenomenon?
A. Epinephrine is binding to two types of receptors in the plasma membrane.
B. The activated receptor complex stimulates production of two different second messengers.
C. Cyclic AMP directly activates enzymes that catabolize glycogen and fat.
D. Cyclic AMP-dependent protein kinase activates two kinds of enzymes.
D
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What type of epithelial junction contains connexons?
A. Desmosome B. Adhering junction C. Flat junction D. Gap junction E. Tight junction
In utero, the fetus is nourished by the ________.
A. umbilical cord B. amniotic fluid C. placenta D. amnion
Golgi tendon organs respond in which of the following ways?
A. inhibit tension in the activated muscle B. initiate tension in the antagonist muscle C. both A and B D. none of the above
A hysterectomy involves removal of the
A. breasts B. ovaries. C. uterine tubes. D. uterus.