47 Questions
What is the primary function of the cell membrane?
To control the entry and exit of substances
Which of the following is NOT a function of the cell membrane?
Storing genetic information
What is the main type of lipid that makes up the cell membrane?
Phospholipids
What is the purpose of the hydrophobic region of a phospholipid?
To attach the phospholipid to the cell membrane
How do phospholipids spontaneously form lipid bilayers?
By aligning their hydrophobic tails towards the center of the membrane
What is the role of the phosphate head group in a phospholipid?
To face the aqueous intracellular or extracellular space
What type of structure may form when phospholipids have small tails or a single hydrocarbon chain?
Micelle
What triggers an inflammatory reaction in surrounding cells due to alterations in phospholipid asymmetry?
Oxidative damage
Which lipid is recognized by surveilling immune cells when it flips its position to join the outer leaflet?
Phosphatidylserine
How does cholesterol influence membrane fluidity?
By decreasing fluidity
Which component of cell membranes has a hydroxyl group at one end and interacts with phospholipid head groups?
Cholesterol
What type of droplet may form when phospholipids have bulkier tails or two hydrophobic tails?
Liposome
Which component forms the foundational structure of the cell membrane?
Bilipid layer
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.
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.
What is the primary function of the cell membrane?
To control the diffusion of substances in and out of the cell
Which of the following is NOT a component of the cell membrane?
Ribosomes
What is the primary effect of cholesterol on membrane fluidity at low temperatures?
Cholesterol prevents the membrane from freezing at low temperatures.
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
Which of the following is NOT a significance of membrane fluidity?
Promoting cell division and growth by allowing membrane contraction.
Which of the following components are responsible for cell adhesion and cytoskeletal support in the cell membrane?
Cell Adhesion Molecules and Cytoskeletal proteins
What is the primary symptom experienced by the hypothermia patient, CH, in the clinical case report?
Confusion and irritability.
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.
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
What is the effect of hypothermia on cell membranes?
It decreases their fluidity and permeability
How does the return to normal body temperature affect the cell membrane?
It allows the cell membrane to regain its normal fluidity
What is the primary function of the cell membrane?
To regulate the traffic of substances in and out of the cell
Which of the following is a potential consequence of decreased cell membrane permeability in hypothermia?
Decreased entry of oxygen and glucose into the cell
What is the role of the lipid bilayer in the cell membrane?
It regulates the entry and exit of substances
What is the primary function of the cell membrane?
To control the diffusion of substances into and out of the cell
What is the main type of lipid that makes up the cell membrane?
Phospholipids
How does cholesterol affect the mobility of the fatty acid chains in phospholipids?
Cholesterol decreases the mobility of the fatty acid chains
Which of the following components are responsible for cell adhesion and cytoskeletal support in the cell membrane?
Membrane proteins
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
What is the primary effect of cholesterol on membrane fluidity at low temperatures?
Cholesterol decreases membrane fluidity at low temperatures
Which of the following is a primary function of cell membranes?
Control the entry and exit of substances
What is the primary role of the phospholipid head group in the cell membrane?
Face the aqueous intracellular or extracellular space
What is the primary function of the hydrophobic region of a phospholipid?
Provide a barrier to water-soluble molecules
How do phospholipids spontaneously form lipid bilayers in an aqueous environment?
They align their polar heads outward and nonpolar tails inward
Which of the following is a key component of the cell membrane that facilitates communication and adhesion between cells?
Glycoproteins
What is the primary function of the lipid bilayer in the cell membrane?
Act as a selective barrier for the cell
How does cholesterol affect the deformability of the lipid bilayer?
Decreases the deformability by immobilizing the fatty acid chains near the polar head groups
What is the main function of membrane fluidity in cellular processes?
Facilitates efficient nutrient absorption and waste product removal
What is the significance of the 'fluid-mosaic' model in understanding cell membranes?
Describes the dynamic and flexible nature of cell membranes
Which cellular process is directly facilitated by proper membrane fluidity?
Cellular communication
What is the primary role of cholesterol in the lipid bilayer at low temperatures?
Prevents hydrocarbon chains from packing together tightly
Why does cholesterol interact with and partly immobilize the regions near the polar head groups in phospholipids?
To decrease membrane fluidity
Test your knowledge on the structure and function of the plasma membrane with this quiz based on the lecture by Dr. Pallav Sengupta. Learn about the bilipid layer, membrane proteins, cell adhesion molecules, and cytoskeletal proteins.
Make Your Own Quizzes and Flashcards
Convert your notes into interactive study material.
Get started for free
