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Ｆｉ!ｎｄ ｉｔ ｈｅｒｅ ｂａ!ｂｅ:
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Select the correct answer from each drop-down menu proteins are

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?

What is the major difference between a virus and a viroid?