Feature detectors are: O A. sensors that process movement. B. part of the Gestalt theory of perception. C. neurons that analyze and respond to specific types of input. O D. neurons that gather olfactory information.

Molecules like glucose and amino acids are not lipid soluble, so cannot cross the cell membrane by simple diffusion. instead, they are shuttled across by carrier proteins in the membrane from high to low concentration. does this process require energy from the cell? this is an example of what type of molecular movement?