Cell Biology: Membrane Proteins and Factors Affecting Membrane Fluidity
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Cell Biology: Membrane Proteins and Factors Affecting Membrane Fluidity

Explore the functions of membrane proteins in transportation, enzyme activity, and signaling, along with factors that influence membrane fluidity. Learn about the movement of membrane phospholipids within the lipid bilayer and how temperature and composition impact membrane properties.

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@ExhilaratingSousaphone

Questions and Answers

What effect does the addition of cholesterol have on animal cell membranes?

Decrease membrane permeability to water

How do cis-double bonds in phospholipids affect membrane fluidity at lower temperatures?

Increase fluidity

What is the impact of shorter hydrocarbon tails in phospholipids on membrane fluidity at lower temperatures?

Increase fluidity

Which factor decreases the mobility of phospholipid tails in the lipid bilayer?

<p>Adding cholesterol</p> Signup and view all the answers

In terms of fluidity, what is the primary role of phospholipid tail length in the membrane?

<p>Increase fluidity</p> Signup and view all the answers

How does the presence of cis-double bonds affect membrane fluidity?

<p>Increase fluidity at higher temperatures</p> Signup and view all the answers

What is the primary function of liposomes?

<p>Facilitate drug delivery into cells</p> Signup and view all the answers

In a phospholipid bilayer, which part of the phospholipid interacts with water?

<p>Polar head group</p> Signup and view all the answers

Cell membrane fluidity is carefully regulated because it is important for which of the following?

<p>Ensuring proper membrane function</p> Signup and view all the answers

What happens to phospholipids within each leaflet in terms of movement in a cell membrane?

<p>They rapidly diffuse between leaflets</p> Signup and view all the answers

Which technique is used to manipulate the cell membrane without causing damage?

<p>Laser tweezers</p> Signup and view all the answers

What structures can pure phospholipids form according to the text?

<p>Closed, spherical liposomes</p> Signup and view all the answers

Why do enzymes in the ER membrane flip lipids from one leaflet to the other?

<p>To maintain the asymmetry of the lipid bilayer</p> Signup and view all the answers

Which protein catalyzes rapid flip-flop of random phospholipids from one leaflet to the other?

<p>Scramblase</p> Signup and view all the answers

What is the function of phospholipids synthesized in the cytosolic leaflet of the endoplasmic reticulum?

<p>Maintain membrane asymmetry</p> Signup and view all the answers

What is the role of glycolipids in the lipid bilayer of an animal cell plasma membrane?

<p>Signal transduction</p> Signup and view all the answers

How are phospholipids and glycolipids distributed in the lipid bilayer of an animal cell plasma membrane?

<p>Unequally distributed in an organized manner</p> Signup and view all the answers

What property of membranes do glycoprotein membranes retain during transfer between cell compartments?

<p>Membrane asymmetry</p> Signup and view all the answers

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