Multiple Choice
Evidence that cell signaling evolved early in the history of life comes from __________.
10. Cell Signaling
Introduction to Cell Signaling
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When steroid hormones enter a cell by simple diffusion, they can be said to do what in terms of concentration?
A
Move up a concentration gradient and are nonpolar
B
Move up a concentration gradient and are polar
C
Move down a concentration gradient and are polar
D
Move through a channel, down a gradient, and are nonpolar
E
None of the listed responses is correct.
Verified step by step guidance1
Understand the nature of steroid hormones: Steroid hormones are nonpolar molecules, which means they can easily pass through the lipid bilayer of cell membranes without the need for transport proteins or channels.
Recognize the concept of concentration gradient: Molecules tend to move from areas of higher concentration to areas of lower concentration, a process known as moving down the concentration gradient.
Identify the mechanism of simple diffusion: Simple diffusion is a passive transport mechanism where molecules move down their concentration gradient without the use of energy or transport proteins.
Apply these concepts to steroid hormones: Since steroid hormones are nonpolar, they move down their concentration gradient by simple diffusion, directly through the cell membrane.
Evaluate the given options: None of the options correctly describe the movement of steroid hormones, as they move down a concentration gradient and are nonpolar, without the need for channels.
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