All of the following pertain to the fluorescence microscope except it
A. requires an ultraviolet radiation source.
B. requires the use of dyes like acridine and fluorescein.
C. uses electrons to produce a specimen image.
D. is commonly used to diagnose certain infections.
E. is a type of compound microscope.
Answer: C
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Arrange the steps of an allergic response in the proper order
1. Allergic symptoms appear. 2. Allergen binds with IgE. 3. IgE combines with mast cell receptors. 4. Mast cells release histamine. 5. Plasma cells sensitized.
a. 5, 3, 2, 4, 1 b. 1, 5, 2, 4, 3 c. 5, 2, 4, 3, 1 d. 1, 4, 5, 2, 3 e. 4, 5, 2, 3, 1
Sensory nerves communicate the strength of a stimulus by
a. the magnitude of the voltage change across the membrane during the action potential. b. the speed at which the action potentials are transmitted down the axon. c. the number of action potentials transmitted down the axon. d. a and b. e. a and c.
Gene therapy ____
a. has not yet been used successfully with mammals b. is a surgical technique that replaces defective genes with normal genes c. has been used successfully to treat victims of autosomal dominant disorders by replacing the dominant allele with a recessive allele d. is a genetic engineering technique that replaces defective alleles with normal ones e. is only possible in adults
Which organ's smooth muscles need to contract in order to reduce air movement to the mammalian respiratory surfaces?
a. those of the epiglottis b. those of the large bronchi c. those of the bronchioles d. those of the trachea