The primary cell wall is mainly made up of
lignin
pectin
cellulose
protein
C.
cellulose
Primary cell wall is the part or layer of cell wall in which cell growth is permitted. It is mainly composed of cellulose. Secondary cell wall is composed of lignin, while the middle lamella is rich is pectin.
In the primary cell wall, major carbohydrates are cellulose, hemicellulose and pectin. The cellulose microfibrils are linked via hemicellulosic tethers to form the cellulose- hemicellulose network, which is embedded in the pectin matrix.
Which of the following is always absent in prokaryotic cells?
Ribosome
Mitochondria
DNA
Cell wall
Objects less than 0.2 m in size cannot be see an under light microscope because
the wave length of visible light is 3900- 7800 Å
only two types of lenses are used
maximum magnifying power of ocular lens is 20 X
maximum magnifying power of objective lens is 100 X
The apoplast is located
outside the plasma membrane
in the entire cytosol
on both sides of plasma membrane
in the plastidial content
ATP synthesis in cell requires
H+ gradient across the membrane
K+ gradient across the membrane
PO4 3- gradient across the membrane
Ca2+ gradient across the membrane
The eukaryotic cells have all of the followings except
peptidoglycan in the cell wall
the 80 S ribosome
nuclear membrane
mitochondria
Two membrane envelops is found in
mitochondria, Golgi apparatus and chloroplast
mitochondria, nucleus and chloroplast
nucleus, Golgi apparatus and endoplasmic reticulum
nucleus, ribosome and chloroplast