Why is ATP needed for muscle contraction?
A) It causes tropomyosin to slide off the myosin-binding sites of actin.
B) It's needed for calcium release from the sarcoplasmic reticulum.
C) It causes calcium to bind to troponin.
D) Myosin must contact the actin filament and move to pull it toward the midline of the sarcomere.
D
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When extra juvenile hormone is experimentally administered to worker bees (Apismellifera), they ____
a. revert to performing duties of younger bees b. live longer and produce more offspring c. begin to mate and lay eggs d. produce more chemicals that reinforce memory e. develop impaired memories
THC, the active ingredient in marijuana, mimics the function of the neurotransmitter ____, resulting in a variety of
effects including ____.
a. dopamine; increased pain perception b. norepinephrine; hallucinogens c. GABA; nervousness d. serotonin; loss of appetite e. anandamide; memory loss
The function of triglycerides is
A) to store energy. B) to form semipermeable membranes. C) to transport substances in and out of cells. D) store information. E) Both B and C are correct.
If you wanted to decrease sperm production, which of the following hormones would be most effective?
A) inhibin B) FSH C) GnRH D) TSH