Yes, the plasma membrane and cell membrane are the same. Both refer to the biological membrane which separates the interior of the cell from the cell’s extracellular space.
What do you mean by biological membrane?
Biological membranes consist of a double sheet (known as a bilayer) of lipid molecules. This structure is generally referred to as the phospholipid bilayer. In addition to the various types of lipids that occur in biological membranes, membrane proteins and sugars are also key components of the structure.
What type of membrane is the cell membrane?
The cell membrane, also called the plasma membrane, is found in all cells and separates the interior of the cell from the outside environment. The cell membrane consists of a lipid bilayer that is semipermeable.
What are biological membranes made of?
The main components of biological membranes are proteins, lipids, and carbohydrates in variable proportions. Carbohydrates account for less than 10% of the mass of most membranes and are generally bound either to the lipid or protein components. Myelin has few functions and is made up almost entirely of lipids.
Is plasma membrane a cell membrane?
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.
What is not found in biological membrane?
So, the correct answer is ‘Lignin’.
What are the function of biological membrane?
Biological membranes have three primary functions: (1) they keep toxic substances out of the cell; (2) they contain receptors and channels that allow specific molecules, such as ions, nutrients, wastes, and metabolic products, that mediate cellular and extracellular activities to pass between organelles and between the …
Why is biological membrane called selectively permeable membrane?
The cell membrane is called selectively permeable as it only allows specific molecules to pass. Only specific molecules like water and gaseous molecules can pass through the cell membrane directly. It stops the flow of other molecules towards the two sides.
Which best describes the structure of a biological membrane?
Which of the following best describes the structure of a biological membrane? *The membrane proteins can be found either embedded in or attached to the surface of the phospholipid bilayer.
Why is cell membrane called plasma membrane?
The cell contains a protoplasm (or simply plasm), which is the semi-fluid living matter. This living matter or plasm is contained inside a biological membrane referred to as the plasma membrane. Because it surrounds the entire cell, this plasma membrane is specifically referred to as the cell membrane.
What are the two major components of cell membranes?
Cell membranes are composed primarily of fatty-acid-based lipids and proteins. Membrane lipids are principally of two types, phospholipids and sterols (generally cholesterol).
How are biological membranes held together?
Despite their differing functions, all biological membranes have a common general structure: each is a very thin film of lipid and protein molecules, held together mainly by noncovalent interactions.
Which of the following statements about biological membranes is not true?
Solution : Statement is false.
Carbohydrates are never found in plasma membrane is not true. The biochemical investigation done on cell membrane clearly demonstrate that the cell membrane possess protein and carbohydrates as biochemical components.
How many types of membranes are there?
Based on their structure, there are main three types of membrane proteins: the first one is integral membrane protein that is permanently anchored or part of the membrane, the second type is peripheral membrane protein that is only temporarily attached to the lipid bilayer or to other integral proteins, and the third …
Is plasma membrane a cell organelle?
In a eukaryotic cell, the organelles bound by a double lipid bilayer include the nucleus, mitochondria, and plastids. Also included are the plasma membrane and the cell wall. Some references consider single-membraned cytoplasmic structures as organelles, such as lysosomes, endosomes, and vacuoles.
Which is not a part of cell membrane?
So, the correct answer is ‘Proline’
Which is not a component of cell membrane?
Proline is an amino acid. It is generally not present in the biological membranes.
What are two essential properties of any biological membrane?
(1) Cell membranes are thin enclosures that form closed boundaries. (2) Cell membranes are made up of lipids, proteins and carbohydrates. (3) Cell membranes consists of a phospholipid bilayer. (4) Cell membranes are held together by non-covalent interactions (5) Membranes are fluid-like structure.
Which is not a function of the cell membrane?
Therefore the correct answer is D) controlling movement into the nucleus since the cell membrane is not responsible for this function.
Which of the following statement concerning biological membrane is correct?
It is selectively permeable to ions and organic molecules and controls the movement of substances in and out of cells apart from cell-cell recognition. It has a host of important properties which include, fluidity, compartmentalization, transport, signaling etc. Thus, the correct answer is option D.
Which of the following biological membrane is selectively permeable?
The cell membrane (otherwise called the plasma membrane, or cytoplasmic membrane, and verifiably alluded to as the plasmalemma) is the semipermeable membrane of a cell that encompasses and encases its substance of cytoplasm and nucleoplasm.
Is selectively permeable and semipermeable the same thing?
Note that a semipermeable membrane is not the same as a selectively permeable membrane. Semipermeable membrane describes a membrane that allows some particles to pass through (by size), whereas the selectively permeable membrane “chooses” what passes through (size is not a factor).
What the cell membrane is selectively permeable?
The membrane is selectively permeable because substances do not cross it indiscriminately. Some molecules, such as hydrocarbons and oxygen can cross the membrane. Many large molecules (such as glucose and other sugars) cannot. Water can pass through between the lipids. Ions such as H+ or Na+ cannot.
Which of the following best describes a cell membrane?
The correct answer is (C) A flexible lipid double layer. The cell membrane is often referred to as a “fluid mosaic,” a flexible structure containing phospholipids as well as some proteins and other important molecules.
Which one of the following is a major constituent of biological membranes?
Phosphorus is the major constituients of (a) Biological membrane (b) Nucleic acid (c) Cellular energy transfer system (d) proteins.