THE CELL
CELL COMMUNICATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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move up a concentration gradient and are nonpolar
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move up a concentration and are polar
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move down a concentration gradient and are polar
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None of the listed responses are correct.
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move through a channel, down a gradient, and are nonpolar
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Detailed explanation-1: -Steroid hormones can pass through the plasma membrane by simple diffusion because they are lipid derived hormones, which means that they are capable of passing through every cell of our body. Unlike other types of hormones, steroid hormones do not have to bind to plasma membrane receptors.
Detailed explanation-2: -Steroid hormones are believed to enter cells solely by free diffusion through the plasma membrane.
Detailed explanation-3: -Steroid hormones are generally thought to pass easily across a plasma membrane into a cell, interacting once inside with soluble nuclear receptors, but recent experiments have demonstrated the importance of membrane-bound receptors in mediating the activity and the metabolism of steroid hormones.
Detailed explanation-4: -Steroid hormones, in general, are believed to freely diffuse across a membrane partly due to their close resemblance to cholesterol (Fig. 1), but recent evidence suggests that they could also enter cells through receptor-mediated endocytosis (10).