Mutations in the genes encoding for IgG could ________.
A. prevent allergic reactions
B. prevent lymphocyte stimulation by antigens
C. block the synthesis of the principle form of circulating antibody
D. prevent antibody secretion in external secretions
Answer: C
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The following is a list of the steps that occur in the production of an auditory sensation. What is the proper sequence for these steps? 1. The pressure wave distorts the basilar membrane on its way to the round window. 2. Movement of the tympanic membrane causes displacement of the malleus. 3. Displacement of the stereocilia stimulates sensory neurons of the cochlear nerve. 4. Movement of the
malleus causes movement of the incus and stapes. 5. Distortion of the basilar membrane forces the hair cells of the spiral organ to vibrate against the tectorial membrane. 6. Movement of the oval window establishes pressure waves in the perilymph of the scala vestibuli. A) 2, 4, 1, 6, 5, 3 B) 2, 4, 6, 3, 5, 1 C) 2, 1, 4, 6, 5, 3 D) 2, 4, 6, 1, 5, 3 E) 2, 5, 4, 6, 1, 3
The gap junctions in cardiac muscle are part of specialized cell junctions that are localized to the ________.
Fill in the blank(s) with the appropriate word(s).
Which statement about gap junctions is incorrect?
a. They consist of protein. b. They are anchored to plaques on the inside surface of the plasma membrane. c. They allow materials to pass from one cell into an adjacent cell. d. They play a role in transmitting electrical activity through the heart. e. They consist of connexons.
Each ovarian ____ contains an immature egg and its surrounding tissues
a. follicles b. oocytes c. ova d. oogenesis