Kinks in unsaturated fatty acid tails prevent tight packing of the phospholipid molecules.

The fluid mosaic model describes the plasma membrane as a dynamic structure. Which of the following best explains how the molecular structure of phospholipids contributes to the fluidity of the membrane?

The ability of the cell to be recognized by other cells, such as immune cells.

A researcher treats a cell with a chemical that removes carbohydrates from the external surface of the plasma membrane. Which of the following functions would most likely be impaired?

It prevents the phospholipids from packing too tightly together and solidifying.

Cholesterol is a vital component of mammalian cell membranes. How does cholesterol regulate membrane fluidity as the environmental temperature decreases?

A sequence of nonpolar amino acids that interact with the fatty acid tails.

Integral membrane proteins are embedded within the hydrophobic core of the lipid bilayer. Which of the following amino acid arrangements is most likely found in the transmembrane domain of such a protein?

Peripheral proteins lack hydrophobic regions and do not penetrate the bilayer.

Which of the following describes a key structural difference between peripheral proteins and integral proteins in the plasma membrane?

The molecule contains both a hydrophilic region and a hydrophobic region.

A cell's plasma membrane is described as 'amphipathic' because of the nature of its phospholipids. What does this term mean in the context of membrane structure?

The cell will fail to communicate or adhere correctly to neighboring cells.

A specific toxin binds to and inhibits the activity of glycoproteins on the surface of human respiratory cells. What is the most likely immediate effect on the cell's function?

The hydrophobic interactions between the tails are relatively weak.

In the fluid mosaic model, why are phospholipids and proteins able to move laterally within the plane of the membrane?

It would allow for the facilitated diffusion of glucose across the membrane.

An artificial membrane is created using only phospholipids. It is found to be highly permeable to water but impermeable to glucose. How would adding transport proteins change this?

The hydrophobic fatty acid tails of the phospholipids.

Which component of the plasma membrane is primarily responsible for forming the selective permeability barrier that prevents the free passage of polar molecules?

English

Practice identifying the molecular structure of phospholipids, proteins, cholesterol, and carbohydrates within the fluid mosaic model.

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Components of the Plasma Membrane

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Bio 1000 Chapter 2 The Molecules of Cells 

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Components of the Plasma Membrane

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Components of the Plasma Membrane

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