The molecular explanation for narcolepsy is that
A) certain brain cells have many extra orexin/hypocretin receptors, so these cells receive too many messages to sleep.
B) the orexin/hypocretin receptor does not reach the cell surfaces of certain brain cells.
C) a gene is missing in chromosome 6 that encodes the protein narcoleptin.
D) a viral infection activates genes that promote sleep.
B) the orexin/hypocretin receptor does not reach the cell surfaces of certain brain cells.
You might also like to view...
Entamoeba histolytica feeds on ________.
A. yeasts B. bacteria C. erythrocytes D. All of the choices are correct.
A major distinguishing feature between monocot and eudicot stems is the organization of the
A. epidermis. B. conducting system. C. vascular tissue. D. secondary tissues. E. ground tissues.
The most widely accepted and supported model that explains the movement of phloem sap in flowering plants is the
____ mechanism.
a. cohesion-tension b. translocation c. pressure flow
d. osmosis e. transpiration
The Hardy-Weinberg principle is applicable provided:a
migration is limited to adults. b. migration only occurs during nonreproductive periods. c. migration is limited to juveniles. d. migration occurs at the beginning of the breeding season. e. migration does not occur.