
Cell membranes are made up of
A) Phospholipids and proteins
B) Pectin
C) cellulose
D) lipid and hemicellulose
Answer
505.5k+ views
Hint:Cell membrane is one of the important constituents of a cell. It separates the cytosol or the cell interior from the outside environment. It also controls the movement of molecules in and out from the cell.
Complete answer:
Cell membrane or the plasma membrane is the outer layer of the animal cell. It protects the cell from the outer environment. The cell membrane is semi permeable in nature which means it selectively allows the passage of molecules in and out of the cell.
It is made up of lipid bilayer. This lipid bilayer along with cholesterol helps in maintaining the fluidity of the cell. It also contains several integral proteins like transporters and membrane proteins. These proteins help in transport of ions and molecules across the membrane. Endocytosis and exocytosis is also one of the primary functions of cell membranes.
Pectin- Middle lamella is made up of calcium pectate or pectins.
Cellulose- It is the primary constituent of the cell wall of green plants.
Lipid and hemicelluloses- It is the chief constituent of the cell wall of plants.
The correct answer is (A). Cell membrane is made up of phospholipids and proteins.
Note: The cell membrane consists of a thin layer of phospholipids which have a hydrophilic head and hydrophobic tail. Plasma membrane also contains glycoprotein which helps in cell-cell recognition. The cell membrane consists of around 50% of proteins which help in carrying out the essential activities of the cell.
Complete answer:
Cell membrane or the plasma membrane is the outer layer of the animal cell. It protects the cell from the outer environment. The cell membrane is semi permeable in nature which means it selectively allows the passage of molecules in and out of the cell.
It is made up of lipid bilayer. This lipid bilayer along with cholesterol helps in maintaining the fluidity of the cell. It also contains several integral proteins like transporters and membrane proteins. These proteins help in transport of ions and molecules across the membrane. Endocytosis and exocytosis is also one of the primary functions of cell membranes.

Pectin- Middle lamella is made up of calcium pectate or pectins.
Cellulose- It is the primary constituent of the cell wall of green plants.
Lipid and hemicelluloses- It is the chief constituent of the cell wall of plants.
The correct answer is (A). Cell membrane is made up of phospholipids and proteins.
Note: The cell membrane consists of a thin layer of phospholipids which have a hydrophilic head and hydrophobic tail. Plasma membrane also contains glycoprotein which helps in cell-cell recognition. The cell membrane consists of around 50% of proteins which help in carrying out the essential activities of the cell.
Recently Updated Pages
Master Class 11 Physics: Engaging Questions & Answers for Success

Master Class 11 Chemistry: Engaging Questions & Answers for Success

Master Class 11 Biology: Engaging Questions & Answers for Success

Class 11 Question and Answer - Your Ultimate Solutions Guide

Master Class 11 Business Studies: Engaging Questions & Answers for Success

Master Class 11 Computer Science: Engaging Questions & Answers for Success

Trending doubts
Explain why it is said like that Mock drill is use class 11 social science CBSE

Which of the following blood vessels in the circulatory class 11 biology CBSE

1 ton equals to A 100 kg B 1000 kg C 10 kg D 10000 class 11 physics CBSE

One Metric ton is equal to kg A 10000 B 1000 C 100 class 11 physics CBSE

Which of the following is nitrogenfixing algae a Nostoc class 11 biology CBSE

Difference Between Prokaryotic Cells and Eukaryotic Cells
