The middle lamella of cell wall is composed of ……..
a) cellulose
b) pectin
c) chitin
d) murein
Explanation: Pectin is a soluble fiber (polysaccharide) found in fruits.
Which of the following statement is correct about the position of cell membrane?
a) it is the outermost boundary of animal cells
b) it lies inner to the cell wall in plant cells
c) it lies above the cell wall of plant and fungal cells
d) both a and b
What is the chemical composition of plasma/cell membrane?
a) lipids (60-80%) and proteins (20-40%)
b) lipids (20-40%) and proteins (60-80%)
c) lipids (60-80%) and carbohydrates (20-40%)
d) carbohydrates (60-80%) and proteins (20-40%)
Explanation: there is a small quantity of carbohydrates present
Who proposed the “Fluid mosaic model” for the structural organization of plasma membrane?
a) Margulies and Schwartz
b) Watson and Crick
c) Singer and Nicolson
d) Camellio Golge
Explanation: The fluid mosaic model describes the cell membrane as a tapestry of several types of molecules (phospholipids, cholesterols, and proteins) that are constantly moving.
In plasma membrane, carbohydrates extend out from the outer surface of the membrane and are attached to…….
a) protein
b) lipids
c) DNA
d) both a and b
Explanation: these are called glycolipid and glycoprotein
Fluid mosaic model favors that cell membrane contains proteins which embedded in fashion of……….
a) criss-cross
b) mosaic
c) zigzag
d) elliptic
