Answer the following question given this paragraph: Water and many other substances cannot simply diffuse across a membrane. Hydrophilic molecules, charged ions, and relatively large molecules such as glucose all need help with diffusion. The help comes from special proteins in the membrane known as transport proteins . Diffusion with the help of transport proteins is called facilitated diffusion . There are several types of transport proteins, including channel proteins and carrier proteins. Both are shown in Figure below . Q: The help with diffusion comes from special proteins in the membrane known as what? Choices: - lazy proteins - navigation proteins - installation proteins - transport proteins A:
The answer to this question is:
transport proteins