Practise AP Biology 2.4.A questions by predicting which molecules cross a hydrophobic bilayer and selecting when channels, transport proteins or diffusion are needed.
Most proteins that are secreted from a cell must be transported to the endoplasmic reticulum (ER) either during translation or after translation.
D.
For any protein that enters the ER, researchers claim that amino acids close to the protein's amino terminus determine how likely the protein is to pass through the protein channel within the ER membrane. Justify the researchers' claim based on your understanding of factors that affect the transport of proteins across membranes.
For any protein that enters the ER, researchers claim that amino acids close to the
protein's amino terminus determine how likely the protein is to pass through the protein
channel within the ER membrane. Justify the researchers' claim based on your
understanding of factors that affect the transport of proteins across membranes.
- Amino acids (at the amino terminus) that have similar polarity to/opposite charge to (the R groups of amino acids lining) the protein channel are more likely to pass
through the channel (than are proteins where the amino terminus contains amino
acids with dissimilar polarity or similar charge).
Point D2