Plasma Membrane Structure and Function Quiz

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What is the primary function of the cell membrane?

To provide energy for the cell

To store genetic information

To control the entry and exit of substances (correct)

To break down food for the cell

Which of the following is NOT a function of the cell membrane?

Compartmentalizing the cell and ensuring organelle-specific functions

Regulating cell shape and aiding in motility

Facilitating communication and adhesion with other cells

Storing genetic information (correct)

What is the main type of lipid that makes up the cell membrane?

Phospholipids (correct)

Triglycerides

Glycolipids

Cholesterol

What is the purpose of the hydrophobic region of a phospholipid?

To attach the phospholipid to the cell membrane Signup and view all the answers

How do phospholipids spontaneously form lipid bilayers?

By aligning their hydrophobic tails towards the center of the membrane Signup and view all the answers

What is the role of the phosphate head group in a phospholipid?

To face the aqueous intracellular or extracellular space Signup and view all the answers

What type of structure may form when phospholipids have small tails or a single hydrocarbon chain?

Micelle Signup and view all the answers

What triggers an inflammatory reaction in surrounding cells due to alterations in phospholipid asymmetry?

Oxidative damage Signup and view all the answers

Which lipid is recognized by surveilling immune cells when it flips its position to join the outer leaflet?

Phosphatidylserine Signup and view all the answers

How does cholesterol influence membrane fluidity?

By decreasing fluidity Signup and view all the answers

Which component of cell membranes has a hydroxyl group at one end and interacts with phospholipid head groups?

Cholesterol Signup and view all the answers

What type of droplet may form when phospholipids have bulkier tails or two hydrophobic tails?

Liposome Signup and view all the answers

Which component forms the foundational structure of the cell membrane?

Bilipid layer Signup and view all the answers

How does cholesterol affect the mobility of the fatty acid chains in phospholipids?

Cholesterol decreases the mobility of the regions of the fatty acid chains closest to the polar head groups. Signup and view all the answers

How does cholesterol affect the deformability of the lipid bilayer?

Cholesterol makes the region of the lipid bilayer closest to the polar head groups less deformable. Signup and view all the answers

What is the primary function of the cell membrane?

To control the diffusion of substances in and out of the cell Signup and view all the answers

Which of the following is NOT a component of the cell membrane?

Ribosomes Signup and view all the answers

What is the primary effect of cholesterol on membrane fluidity at low temperatures?

Cholesterol prevents the membrane from freezing at low temperatures. Signup and view all the answers

What is the significance of the 'fluid-mosaic' model proposed by Singer and Nicolson?

It describes the cell membrane as a dynamic, fluid-like structure Signup and view all the answers

Which of the following is NOT a significance of membrane fluidity?

Promoting cell division and growth by allowing membrane contraction. Signup and view all the answers

Which of the following components are responsible for cell adhesion and cytoskeletal support in the cell membrane?

Cell Adhesion Molecules and Cytoskeletal proteins Signup and view all the answers

What is the primary symptom experienced by the hypothermia patient, CH, in the clinical case report?

Confusion and irritability. Signup and view all the answers

What is the likely reason why CH, the Alzheimer's patient, wandered away from his home unnoticed?

His Alzheimer's disease had progressed, causing him to become disoriented. Signup and view all the answers

In the clinical case of hypothermia, what is likely happening at the level of the cell membrane?

The fluidity of the membrane is decreasing, hindering the diffusion of substances Signup and view all the answers

What is the effect of hypothermia on cell membranes?

It decreases their fluidity and permeability Signup and view all the answers

How does the return to normal body temperature affect the cell membrane?

It allows the cell membrane to regain its normal fluidity Signup and view all the answers

What is the primary function of the cell membrane?

To regulate the traffic of substances in and out of the cell Signup and view all the answers

Which of the following is a potential consequence of decreased cell membrane permeability in hypothermia?

Decreased entry of oxygen and glucose into the cell Signup and view all the answers

What is the role of the lipid bilayer in the cell membrane?

It regulates the entry and exit of substances Signup and view all the answers

What is the primary function of the cell membrane?

To control the diffusion of substances into and out of the cell Signup and view all the answers

What is the main type of lipid that makes up the cell membrane?

Phospholipids Signup and view all the answers

How does cholesterol affect the mobility of the fatty acid chains in phospholipids?

Cholesterol decreases the mobility of the fatty acid chains Signup and view all the answers

Which of the following components are responsible for cell adhesion and cytoskeletal support in the cell membrane?

Membrane proteins Signup and view all the answers

What is the likely reason why CH, the Alzheimer's patient, wandered away from his home unnoticed?

Alzheimer's disease impaired his cognitive and spatial awareness Signup and view all the answers

What is the primary effect of cholesterol on membrane fluidity at low temperatures?

Cholesterol decreases membrane fluidity at low temperatures Signup and view all the answers

Which of the following is a primary function of cell membranes?

Control the entry and exit of substances Signup and view all the answers

What is the primary role of the phospholipid head group in the cell membrane?

Face the aqueous intracellular or extracellular space Signup and view all the answers

What is the primary function of the hydrophobic region of a phospholipid?

Provide a barrier to water-soluble molecules Signup and view all the answers

How do phospholipids spontaneously form lipid bilayers in an aqueous environment?

They align their polar heads outward and nonpolar tails inward Signup and view all the answers

Which of the following is a key component of the cell membrane that facilitates communication and adhesion between cells?

Glycoproteins Signup and view all the answers

What is the primary function of the lipid bilayer in the cell membrane?

Act as a selective barrier for the cell Signup and view all the answers

How does cholesterol affect the deformability of the lipid bilayer?

Decreases the deformability by immobilizing the fatty acid chains near the polar head groups Signup and view all the answers

What is the main function of membrane fluidity in cellular processes?

Facilitates efficient nutrient absorption and waste product removal Signup and view all the answers

What is the significance of the 'fluid-mosaic' model in understanding cell membranes?

Describes the dynamic and flexible nature of cell membranes Signup and view all the answers

Which cellular process is directly facilitated by proper membrane fluidity?

Cellular communication Signup and view all the answers

What is the primary role of cholesterol in the lipid bilayer at low temperatures?

Prevents hydrocarbon chains from packing together tightly Signup and view all the answers

Why does cholesterol interact with and partly immobilize the regions near the polar head groups in phospholipids?

To decrease membrane fluidity Signup and view all the answers

Plasma Membrane Structure and Function Quiz

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Questions and Answers

What is the primary function of the cell membrane?

Which of the following is NOT a function of the cell membrane?

What is the main type of lipid that makes up the cell membrane?

What is the purpose of the hydrophobic region of a phospholipid?

How do phospholipids spontaneously form lipid bilayers?

What is the role of the phosphate head group in a phospholipid?

What type of structure may form when phospholipids have small tails or a single hydrocarbon chain?

What triggers an inflammatory reaction in surrounding cells due to alterations in phospholipid asymmetry?

Which lipid is recognized by surveilling immune cells when it flips its position to join the outer leaflet?

How does cholesterol influence membrane fluidity?

Which component of cell membranes has a hydroxyl group at one end and interacts with phospholipid head groups?

What type of droplet may form when phospholipids have bulkier tails or two hydrophobic tails?

Which component forms the foundational structure of the cell membrane?

How does cholesterol affect the mobility of the fatty acid chains in phospholipids?

How does cholesterol affect the deformability of the lipid bilayer?

What is the primary function of the cell membrane?

Which of the following is NOT a component of the cell membrane?

What is the primary effect of cholesterol on membrane fluidity at low temperatures?

What is the significance of the 'fluid-mosaic' model proposed by Singer and Nicolson?

Which of the following is NOT a significance of membrane fluidity?

Which of the following components are responsible for cell adhesion and cytoskeletal support in the cell membrane?

What is the primary symptom experienced by the hypothermia patient, CH, in the clinical case report?

What is the likely reason why CH, the Alzheimer's patient, wandered away from his home unnoticed?

In the clinical case of hypothermia, what is likely happening at the level of the cell membrane?

What is the effect of hypothermia on cell membranes?

How does the return to normal body temperature affect the cell membrane?

What is the primary function of the cell membrane?

Which of the following is a potential consequence of decreased cell membrane permeability in hypothermia?

What is the role of the lipid bilayer in the cell membrane?

What is the primary function of the cell membrane?

What is the main type of lipid that makes up the cell membrane?

How does cholesterol affect the mobility of the fatty acid chains in phospholipids?

Which of the following components are responsible for cell adhesion and cytoskeletal support in the cell membrane?

What is the likely reason why CH, the Alzheimer's patient, wandered away from his home unnoticed?

What is the primary effect of cholesterol on membrane fluidity at low temperatures?

Which of the following is a primary function of cell membranes?

What is the primary role of the phospholipid head group in the cell membrane?

What is the primary function of the hydrophobic region of a phospholipid?

How do phospholipids spontaneously form lipid bilayers in an aqueous environment?

Which of the following is a key component of the cell membrane that facilitates communication and adhesion between cells?

What is the primary function of the lipid bilayer in the cell membrane?

How does cholesterol affect the deformability of the lipid bilayer?

What is the main function of membrane fluidity in cellular processes?

What is the significance of the 'fluid-mosaic' model in understanding cell membranes?

Which cellular process is directly facilitated by proper membrane fluidity?

What is the primary role of cholesterol in the lipid bilayer at low temperatures?

Why does cholesterol interact with and partly immobilize the regions near the polar head groups in phospholipids?

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