Following statements are regarding to archaeal lipids.

A. archaea have membrane lipids containing long-chain (32 carbons) branched hydrocarbons linked at each end to glycerol.

B. archaeal lipids are twice the length of phospholipids and sphingolipids, and can span the full width of the plasma membrane.

C. In archaeal lipids, at each end of the extended molecule is a polar head consisting of glycerol linked to either phosphate or sugar residues.

D. The glycerol moiety of the archaeal lipids is same as the stereoisomer as that in the lipids of bacteria and eukaryotes.

Which of the following statement is incorrect?

#Question id: 2241

#Unit 2. Cellular Organization

Which of the following statement(s) is (are) true of V-class proton pumps?

#Question id: 2242

#Unit 2. Cellular Organization

What two features of the structure of cholesterol make it somewhat amphipathic?

#Question id: 2243

#Unit 2. Cellular Organization

Features of the fluid mosaic model of membrane structure include:

A. a lipid bilayer.

B. dynamic motion of both membrane lipids and proteins.

C. proteins that may either rest on the surface or penetrate the membrane.

D. the hydrophobic core of the bilayer prevents the unassisted movement of water-soluble substances from one side to the other.

E. Covalent interactions between phospholipids, and between phospholipids and proteins, lend strength and resilience to the membrane.

Which of the following is correct?

#Question id: 2244

#Unit 2. Cellular Organization

Arrange the statements below in the proper sequence of events that occur in an action potential:

I. The resting potential is re-established.

II. A stimulus depolarizes the membrane to threshold.

III. Na+ gates open and Na+ rushes into the cell.

IV. K+ gates open and K+ rushes out of the cell.

#Question id: 2245

#Unit 2. Cellular Organization

Which of these statements is generally true of integral membrane proteins?

#Question id: 2246

#Unit 2. Cellular Organization

Which of the following statements describe(s) the typical biomembrane?

a. It may include different types of lipid molecules.

b. The lipid molecules in the membrane are attached to each other though covalent bonds.

c. All lipids and proteins in the biomembrane are equally mobile.

d. It contains a hydrophilic core.

e. It has a cytosolic face and an exoplasmic face.