The Cell membrane Flashcards
How does cholesterol contribute to the cell membrane?
Cholesterol makes the cell membrane fluid, allowing it to flex and bend.
What does it mean for the cell membrane to be selectively permeable?
It means the membrane only allows certain nutrients and ions to pass through.
What is the composition of the cell membrane?
It is made of two layers of phosphate and lipid/fat, also known as the “phospholipid bilayer.”
What is the role of the cell membrane in hormone recognition?.
It serves as the site of recognition for hormones
What are the main components of the cell membrane?
It is made up of fats/lipids such as phospholipids, glycolipids, and cholesterol, as well as proteins including peripheral and intrinsic proteins.
What types of lipids are found in the cell membrane?
Phospholipids, glycolipids, and cholesterol are the main types of lipids present.
What role do proteins play in the cell membrane?
Proteins in the cell membrane serve various functions including transport, signaling, and structural support.
What distinguishes peripheral proteins from intrinsic proteins in the cell membrane?
Peripheral proteins are found on the surface of the membrane and are easily removable, while intrinsic proteins span the membrane and are embedded within it.
What is the nature of the phosphate head in the cell membrane?
The phosphate head is hydrophilic, meaning it is water-loving.
:What characterizes the fatty acid tails in the cell membrane?
The fatty acid tails are hydrophobic, meaning they are water-fearing.
What is the significance of the bilayer arrangement in the cell membrane?
The bilayer arrangement is fundamental to the structure of the cell membrane, providing a barrier that separates the internal environment of the cell from its external surroundings.
What role do carbohydrate heads play in cell membrane function?
Carbohydrate heads act as a way for cells to identify each other, facilitating cell recognition and communication.
How many monosaccharide units may carbohydrate chains consist of in the cell membrane?
Carbohydrate chains may consist of 2-60 monosaccharide units, typically arranged in hexagons.
What is the role of cholesterol in the cell membrane?
Cholesterol plays a key role in minimizing the effects of temperature on the fluidity (flexibility) of the lipid bilayer.
Where is cholesterol typically found in the cell membrane?
Cholesterol is embedded among the phospholipids of the membrane.
