50 pts
write about Plasma membrane.
Answers
The plasma membrane, also called the cell membrane, is the membrane found in all cells that separates the interior of the cell from the outside environment.
In bacterial and plant cells, a cell wall is attached to the plasma membrane on its outside surface.
The primary function of the plasma membrane is to protect the cell from its surroundings.
Composed of a phospholipid bilayer with embedded proteins, the plasma membrane is selectively permeable to ions and organic molecules and regulates the movement of substances in and out of cells.
All cells are surrounded by a plasma membrane.
The membrane is composed of a phospholipid bilayer arranged back-to-back.
The membrane is also covered in places with cholesterol molecules and proteins.
The plasma membrane is selectively permeable and regulates which molecules are allowed to enter and exit the cell.
Being selectively permeable to ions and organic molecules, it controls the movement of substances in and out of cells.
Practically; cell membrane is also called the plasma-membrane because the cell its self is made of a phospholipid bilayer.
But cell membrane and plasma membrane are two terms which are used interchangeably.
The plasma membrane which surrounds the cell is called the cell membrane.
Plasma membrane also surrounds the organelles of eukaryotes.
All cells have an outer plasma membrane that regulates not only what enters the cell, but also how much of any given substance comes in.
Unlike prokaryotes, eukaryotic cells also possess internal membranes that encase their organelles and control the exchange of essential cell components.
A plasma membrane(a.k.a. phospholipid bilayer) surrounds all biological cells, eukaryotic cell organelles— e.g., the cell nucleus, endoplasmic reticulum, chloroplasts, mitochondria, and more — as well as intracellular transport vesicles.
The principal components of the plasma membrane are lipids (phospholipids and cholesterol), proteins, and carbohydrate groups that are attached to some of the lipids and proteins.
A phospholipid is a lipid made of glycerol, two fatty acid tails, and a phosphate-linked head group.
The cell membrane was discovered by Swiss botanist Carl Naegeli and C. Cramer in 1855.
For about 200 years after the microscope was discovered, no one thought the cell membrane existed as they could only see the cell wall.
Plasma membrane is also known as semi permeable as it allows certain molecules to pass through it while stopping others.
It protects intracellular organelles from the outside environment.
It selectively allows the molecules to move in and out of the cell.
Answer:
All cells are surrounded by a plasma membrane. The membrane is composed of a phospholipid bilayer arranged back-to-back. The membrane is also covered in places with cholesterol molecules and proteins. The plasma membrane is selectively permeable and regulates which molecules are allowed to enter and exit the cell.
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