Which of the following binds to the active site of an enzyme?
water
product
substrate
any other enzyme
None of the choices are correct.
substrate
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__________ vesicles are transported to the membrane by the motor protein __________
A) Filled; kinesin B) Filled; dynein C) Empty; kinesin D) Empty; dynein Fill in the blanks with the correct answers.
The portion of the eye that contains blood vessels, pigment cells, loose connective tissue, and intrinsic muscle fibers is the
A) conjunctiva. B) cornea. C) iris. D) pupil. E) canthus.
Which of the following is a hormonal change that occurs near the end of a normal pregnancy?
A. Plasma progesterone levels decrease while the levels of estrogen continue to increase. B. Estrogens stimulate connexin synthesis in the myometrium. C. Plasma estrogen levels decrease while the levels of progesterone continue to increase. D. Estrogen blocks the synthesis of oxytocin receptors on uterine smooth muscle. E. There is a surge in the LH concentration.
An autorhythmic heart cell is one in which
A. action potentials always occur at exactly the same frequency. B. action potentials are stimulated by internal stores of acetylcholine. C. action potentials fire spontaneously. D. action potentials are initiated by the autonomic nervous system. E. all filaments contract and relax with a high degree of synchrony.