Refer to Table 5.1. From cells located in another part of the alien's body, you find that the protein-to-lipid ratio of the cell membrane is about 20% protein, 78% lipid, and 2% carbohydrate. Assuming the aliens use their cells as Earthlings do, and have the same terrestrial physiology, what is the most likely function of these cells?
What will be an ideal response?
Similar to the myelin membrane around nerve cells–good insulators.
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Unicellular exocrine glands are
A) arranged in a secretory sheet. B) mixed exocrine glands. C) connected to a surface by ducts. D) also called goblet cells. E) None of the answers are correct
Lipid-soluble substances move through the blood-brain barrier by
A) active transport. B) mediated transport. C) diffusion. D) None of the above.
Which of the following can be fertilized?
A) primary oocyte B) oogonium C) polar body D) secondary oocyte
Which of the following statements concerning the micturition reflex is false?
A. The micturition reflex is initiated by stretching the bladder wall. B. Afferent signals are conducted to the sacral segments of the spinal cord by the pelvic nerves. C. Efferent signals are sent to the bladder by sympathetic fibers in the pelvic nerve. D. The micturition reflex usually produces a series of contractions of the urinary bladder. E. The micturition reflex is modified by centers in the pons and cerebrum.