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

You are studying the transport of a particular substance into epithelial cells grown in culture. You notice that you can only find the substance inside the cell when ATP is present. How is the protein moving through the membrane?

Which eukaryotic organelle is associated with the breakdown of macromolecules?

A single molecule is always either hydrophobic or hydrophilic, and can never possess (at the same time) a region that is hydrophobic and a region that is hydrophilic.

Exposure of purified phospholipids to water results in the spontaneous formation of:

How many membranes make up a chloroplast?

A protein that is temporarily associated with a biological membrane is a(n):

Which one of the following cell types would likely have the MOST extensive system of smooth endoplasmic reticulum?

Which one of the following would be found in the cells of a blade of grass but not in the cells of an insect feeding on that grass?

Which of the following would be expected to decrease the fluidity of a membrane?

A vesicle is most similar to a:

The process of diffusion requires:

The controlled release of cellular material stored in membrane-bound vesicles to the outside of the cell is an example of:

Some drugs are now being delivered into cells through liposomes, in which the drug is surrounded by a phospholipid bilayer. How do the drugs enter into the cell?

Some plant cells take advantage of the high concentration of protons outside the cell to move solutes, such as sucrose, across the plasma membrane into the cell where the sucrose concentration is already relatively high. This type of transport is an example of:

What accounts for the ability of vesicles to fuse with different membrane compartments in the cell?

Which of the following sequences of events correctly describes the progress of a protein that will be secreted from the cell? 1)SRP binds to the growing polypeptide chain and to the ribosome. 2) Translation resumes. 3) SRP binds to its receptor. 4) The signal sequence is cleaved. 5) Protein synthesis begins in the cytosol. 6) Translation pauses.

How is the energy stored in a molecule of ATP used by the sodium-potassium pump?

Which of the following is TRUE about the presence or absence of plasma membranes?

Why does active transport require ATP?

A beaker contains two solutions of salt dissolved in water. The two solutions have different concentrations (measured by molarity, M) and are separated by a membrane that is permeable to both salt and water. Which of the following statements is TRUE?