Water moves through a plant because of the property of
A) high heat of vaporization. B) cohesion.
C) high heat of fusion. D) high specific heat.
B
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In a reflex arc, the correct sequence of cell types through which an electrical signal would pass would be
A. motor neuron ? sensory neuron ? interneuron in the PNS B. sensory neuron ? interneuron in the CNS ? motor neuron C. sensory neuron ? motor neuron ? interneuron in the CNS D. motor neuron ? interneuron in the PNS ? sensory neuron
A scanning confocal microscope
A. produces specimen images on electron micrographs. B. uses dyes that emit visible light when excited by ultraviolet radiation. C. uses ultraviolet light to form a specimen image. D. scans narrow planes and can build a three-dimensional image of the specimen.
You are a professor supervising first year medical students. One student is examining the adrenal gland of his cadaver. "Wow!" he exclaims, "This person must have had an endocrine problem. Their adrenal gland lacks any kind of duct connecting it to the bloodstream. The hormones could only have oozed out." How do you respond?
A. "That makes their adrenal gland similar to an exocrine organ." B. "Look carefully and you will see the nerves that transport the hormones into the bloodstream." C. "That's normal. The hormones ooze out and diffuse into nearby capillaries, which is why endocrine glands are sometimes called 'ductless glands'." D. "Do you see signs of adrenal insufficiency, such as low fat stores or muscle degeneration?"
White blood cells have surface receptors called _________ receptors that serve as their "feelers" for foreign substances.
A) Pattern recognition B) Pathogen molecular C) Antibody recognition D) Immunogenic