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TLS Online TPP Program
#Question id: 14905
#Unit 6. System Physiology – Plant
A thin layer called the middle lamella is found at the interface, middle lamella is typically enriched with acidic polysaccharides_____A______, which may be complexed with_______B__________.
TLS Online TPP Program
#Question id: 14906
#Unit 6. System Physiology – Plant
The specific linkages between sugar rings, including the specific carbons that are linked together and the configuration of the linkage, are important for the properties of the polysaccharide;
I) Amylose a) β(1,3)-linkages
II) Cellulose b) β (1,4)-linkages
III) Callose c) α(1,4)-linked
d) α (1,3)-linkages
Which of the following linkage combinations is correct linkages of the polysaccharides?
TLS Online TPP Program
#Question id: 14947
#Unit 6. System Physiology – Plant
Nonenzymatic proteins whose exact functions are uncertain. Such proteins may be localized in the walls of specific cell types or more widespread
cell wall protein Tissue localization
A) HRGP (hydroxyproline rich glycoprotein) i) Xylem, fibers, cortex, root hairs
B) AGP (arabinogalactan protein) ii) Primary xylem and phloem
C) PRP (proline-rich protein) iii) Cambium, vascular parenchyma
D) GRP (glycine-rich protein) iv) Varied cell-specific expression
Which of the following combinations of nonenzymatic protein with its correct location?
TLS Online TPP Program
#Question id: 14948
#Unit 6. System Physiology – Plant
Cellulose microfibrils have an ordered structure and are synthesized at the plasma membrane, given characteristics of microfibrils;
a) Each microfibril is composed of an estimated 18 parallel chains of (1,4)-linked β-D-glucose chains tightly bonded to each other to form a crystalline microfibril
b) Microfibrils have hydrophilic surfaces, populated by polar –OH groups extending from the plane of the sugar rings
c) Microfibrils have hydrophobic surfaces, populated by nonpolar C–H groups populating the sides of stacked glucose chains
d) microfibril important for enzymatic attack by microbial cellulases, which dock onto the hydrophobic surface and remove one glucan chain at a time
Which of the following from given characteristics of microfibrils is incorrect?
TLS Online TPP Program
#Question id: 14949
#Unit 6. System Physiology – Plant
How the matrix polysaccharides differ from the cellulose?
TLS Online TPP Program
#Question id: 14950
#Unit 6. System Physiology – Plant
NMR studies of the pectin molecules not indicate that,