In what part of the cell does a polar signaling molecule bind its receptor? A nonpolar signaling
molecule? Explain your reasoning. What will be an ideal response?
Polar signaling molecules bind membrane receptors whereas nonpolar bind cytpplasmic
receptors.Polar slgnaling molecules are hydrophilic and cannot cross the plasma membrane. Nonpolar
signal molecules are hydrophobic and able to cross the plasma membrane to bind a cytoplasmic
receptor.
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How do lampreys differ from other vertebrates?
What will be an ideal response?
The toxin of botulism is classified as a(n)
A. enterotoxin. B. endotoxin. C. neurotoxin. D. toxoid.
Plasma approximately makes up what percent of the total blood volume?
a. 10 percent b. 25 percent c. 50 percent d. 75 percent e. 90 percent
Visual accommodation involves the ability to ____.
A. change the sensitivity of the rods and cones by means of neurotransmitters B. change the position of the retina C. change the thickness of the lens by contracting or relaxing certain muscles D. protect the eyeball from foreign matter E. prevent eye strain