Practise AP Biology 2.4 questions by connecting bilayer permeability and cell-wall support to how plant, bacterial and animal cells respond to their environments.
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
Intact cells of two unknown cell types were placed into solutions with different concentrations of NaCl. Type I
cells swelled and burst in the solution with the lowest concentration of NaCl. Type II cells swelled but did not
burst in the solution with the lowest concentration of NaCl.
Which of the following descriptions of cell type I and cell type II are most consistent with the data?
Cell Type I: Animal cell surrounded by a plasma membrane only; Cell Type II: Plant cell surrounded by a plasma membrane and a cell wall
Cell Type I: Plant cell surrounded by a plasma membrane only; Cell Type II: Bacterial cell surrounded by a cell wall only
Cell Type I: Plant cell surrounded by a plasma membrane only; Cell Type II: Animal cell surrounded by a plasma membrane and a cell wall
Cell Type I: Animal cell surrounded by a cell wall only; Cell Type II: Bacterial cell surrounded by a plasma membrane only
A