Exam 7: Membranes: Their Structure,function,and Chemistry

Which of the following would best be used to determine the lipid content of an isolated membrane fraction?

Each of the following is a type of cell-cell junctions except

Individuals with the O blood group are known as universal donors because the Gal and GlcNAc groups that are recognized by the antibodies in A,B,and AB in other individuals are missing.Which of which of the following types of erythrocyte plasma membrane components lacks these GlcNAc groups?

Predict which of the following lipid characteristics would be most important to form the best liposomes for delivering a drug into a cell.

The technique of transferring proteins from SDS-PAGE gels onto a membrane and using labeled antibodies to identify particular proteins is known as ________.

Using a radioactive molecule to identify which membrane proteins bind the molecule is called ________.

Cell-cell communication in plants takes place via specialized structures called

Localized regions of plasma membranes that contain cholesterol and proteins involved in cell signaling are known as

________ is a sterol associated with fungal cell membranes.

Starting with shredded spinach leaves,you follow a procedure that separates cellular organelles into different fractions.To identify the fraction that contains the mitochondria,you should test for the presence of

The technique that separates denatured proteins based on size is

You are interested in the mobility of two different unknown integral plasma membrane proteins-protein X and protein Y-in a cell.In one cell,you fluorescently label all the X proteins.In another cell,you label all the Y proteins.When you perform FRAP analysis on both cells,you find that most of the protein X fluorescence has recovered within 3 minutes,but recovery of the protein Y fluorescence is significantly slower.Even after 10 minutes,only 50% of the protein Y fluorescence has recovered.Describe the FRAP experimental protocol,explain what the results tell you about mobility of the X and Y proteins,and propose a possible explanation for why the mobilities of the two proteins differ.

Each of the following is typical characteristics of an integral membrane protein transmembrane segment except

FRAP has revealed that some proteins move in cell membranes much slower than they move in reconstituted liposomes.Which of the following could account for limited mobility of proteins in cell plasma membranes?

Most carbon double bonds in naturally occurring unsaturated fatty acids are in the ________ configuration,but some are in the ________ configuration,making the shape and packing of those fatty acids more like that of saturated fatty acids.

________ organisms are unable to regulate their body temperature and must rely on ________ to maintain optimal membrane fluidity.

Lipid rafts are associated with which of the following activities?

Which of the following is a sterol-like lipid associated with plant cell membranes?

A colleague gives you two tubes containing membrane fractions from an animal cell lysate.One tube contains the plasma membrane fraction,and the other tube contains the mitochondrial inner membrane fraction,but the tubes are not labeled.When you analyze the macromolecule composition of the samples,you are confident that the second tube contains the mitochondrial fraction,because the sample has

Which of the following molecules enters kidney cells via a specific transporter?