Melanin
A. is increased with exposure to infrared light.
B. is a pigment produced by cells in the stratum corneum.
C. makes the skin lighter.
D. is absent in individuals with albinism.
E. is transferred to other cells by osmosis.
Answer: D
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As a neuron's refractory period ends, its sodium channels are changing from
A. their resting state to their inactivated state. B. their inactivated state to their resting state. C. their resting state to their activated state. D. their activated state to their resting state.
Which of the following parts of the nervous system control skeletal muscle?
A) sensory B) parasympathetic C) autonomic D) somatic E) sympathetic.
Which ligament anchors the anterior portion of the uterus?
A) suspensory ligament B) ovarian ligament C) broad ligament D) round ligament
The movement of protein molecules within the phospholipid bilayer is described by the
A. cholesterol mosaic model. B. protein-lipid mosaic model. C. fluid mosaic model. D. lipid mosaic model.