Protein folding is not a completely random, trial-and-error process, This problem was first pointed out by

TLS Online TPP Program

#Question id: 14902

#Unit 6. System Physiology – Plant

Transpirational water flow in the xylem requires a mechanically strong wall that resists from,

TLS Online TPP Program

#Question id: 14903

#Unit 6. System Physiology – Plant

Cell walls of prokaryotes, fungi, algae, and plants differ from each other in chemical composition and molecular structure, yet they all serve three common functions:

a) regulating cell volume

b) determining cell shape

c) mechanically protecting the delicate protoplast against biochemical and physical assaults

d) used to make synthetic fibers

Which of the following common functions is correct?

TLS Online TPP Program

#Question id: 14904

#Unit 6. System Physiology – Plant

Cell walls commonly are classified into two major types. This classification is based not on structural or biochemical differences;

A) primary walls and

B) secondary walls

i) walls formed during cell growth

ii) walls that are formed after cell enlargement stops

iii) multilayered walls that are strengthened and waterproofed by lignin

iv) Usually they are thin and simple, but sometimes may be thick and multilayered, such as those found in collenchyma or in the epidermis

v) highly specialized in structure and composition, reflecting the differentiated state of the cell

Which of the following correctly represents features of primary and secondary walls?

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?