Exam 5: Organizing Principles: Lipids, Membranes, and Cell Compartments

Freeze fracture is a technique used to visualize membrane proteins. In this technique, cells are rapidly frozen and then split, separating the lipid bilayer into its two component layers. Transmembrane proteins stay associated with one layer and leave a pit in the other. The fluid mosaic model predicts what kind of pattern of proteins and pits?

Which of the following is NOT part of the endomembrane system?

Which of the following organelles could be considered recycling centers of eukaryotic cells?

Which one of the following describes the hydrophilic component of cholesterol?

Chloroplasts and mitochondria are MOST closely related to certain:

A proton pump is needed in the lysosomal membrane because:

Which property of membrane phospholipids allows membrane proteins involved in the same biochemical pathway to associate with each other?

The interior region of a phospholipid bilayer is characterized as:

The term homeostasis refers to the ability of:

Which one of the choices below can be used to CORRECTLY complete the following sentence? "All _____ have a plasma membrane."

Passive transport of a molecule across a lipid bilayer only occurs if there is a significant difference in the concentration of that molecule from one side of the bilayer to the other.

Which of the following is a common function of membrane proteins?

Which of the following is responsible, in part, for keeping the cytoplasm of red blood cells isotonic with the blood plasma, and thereby preventing either lysis or shrinking of the cells?