In the absence of calcium, binding of myosin to actin is directly blocked by ______.

A. titin
B. tropomyosin
C. troponin
D. z lines


Ans: B. tropomyosin

Biology & Microbiology

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In cases of the "winter blues" treatment with a

bright artificial light can reduce the effects by a. increasing thyroid gland activity. b. decreasing pineal gland activity. c. increasing gonadal output. d. pancreas reduction. e. kidney adrenal gland activation

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A substance that diffuses across a cell membrane tends to move _______.

a) toward the area where it is more concentrated b) away from the area where it is less concentrated c) none of the choices is correct d) away from the area where it is more concentrated

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A pregnant woman comes into the hospital past her due date. The doctor decides it is time for the baby to be delivered. Before performing a cesarean section, the doctor wants to try to induce labor

Which of the following would she most likely inject? A) progesterone B) luteinizing hormone (LH) C) follicle-stimulating hormone (FSH) D) oxytocin

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