AP BIOLOGY

LABORATORY REVIEW

DIFFUSION AND OSMOSIS

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Proteins built into the cell membrane which assist with the movement of materials are called:
A
receptor proteins
B
transport proteins
C
marker proteins
D
channel proteins
Explanation: 

Detailed explanation-1: -Carrier proteins and channel proteins are the two major classes of membrane transport proteins. Carrier proteins (also called carriers, permeases, or transporters) bind the specific solute to be transported and undergo a series of conformational changes to transfer the bound solute across the membrane (Figure 11-3).

Detailed explanation-2: -Transport proteins generally perform two types of transport: “facilitated diffusion, ” where a transport protein simply creates an opening for a substance to diffuse down its concentration gradient; and “active transport, ” where the cell expends energy in order to move a substance against its concentration gradient.

Detailed explanation-3: -Transport proteins in the cell membrane allow for selective passage of specific molecules from the external environment. Each transport protein is specific to a certian molecule (indicated by matching colors).

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