PHYSIOLOGY
ENDOCRINOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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They are water insoluble (hydrophobic) and circulate bound to a carrier protein
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Steroids
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Amines
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Peptides and Proteins
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None of the above
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Explanation:
Detailed explanation-1: -The carrier proteins involved in facilitated diffusion simply provide hydrophilic molecules with a way to move down an existing concentration gradient (rather than acting as pumps).
Detailed explanation-2: -Small lipids and steroids are hydrophobic and can readily cross the membrane. Molecules that are hydrophilic, on the other hand, cannot pass through the cell membrane-at least not without help-because they are water-loving like the exterior of the membrane, and are therefore excluded from the interior of the membrane.
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