In 1988, Richardson and Richardson observed that certain amino acid residues are statically favored as the amino-terminal caps for the alpha helices in 45 globular proteins. Which of the following statement stand correct with stability of helix?

A. The introduction of a negatively charged side chain at the N-cap, which can neutralize the partial dipole created by the unpaired amide protons, has been shown to increase stability

B. In particular, Gly is often observed at the both C-cap position and N-cap positions

C. In particular, Gly is often observed at the C-cap position only

D. In particular, Gly is often observed at the C-cap position, Asn at the N-cap position, Pro at the Ncap+1 and Asp and Glu at N2 and N3

TLS Online TPP Program

#Question id: 13552

#Unit 6. System Physiology – Plant

Transpiration from the leaf depends on two major factors;

TLS Online TPP Program

#Question id: 13553

#Unit 6. System Physiology – Plant

According this graph which statements is most appropriate ;

a) The air surrounding the leaf is very still, the layer of unstirred air on the surface of the leaf may be so thick that it is the primary deterrent to water vapor loss from the leaf   

b) The air surrounding the leaf is very still, reduces the thickness of the boundary layer at the leaf surface, reducing the resistance of this layer

c) The moving air reduces the thickness of the boundary layer at the leaf surface, reducing the resistance of this layer    

d) The moving air, the layer of unstirred air on the surface of the leaf may be so thick that it is the primary deterrent to water vapor loss from the leaf

TLS Online TPP Program

#Question id: 13554

#Unit 6. System Physiology – Plant

The microscopic stomatal pores provide a pathway for diffusional movement of gases across the epidermis and cuticle

TLS Online TPP Program

#Question id: 13555

#Unit 6. System Physiology – Plant

Water Loss Is Also Regulated by the Pathway Resistance

TLS Online TPP Program

#Question id: 13556

#Unit 6. System Physiology – Plant

The Guard Cells Have Specialized Features are

a) guard cells have a characteristic dumbbell shape, with bulbous ends

b) guard cells are always flanked by a pair of differentiated epidermal cells called subsidiary cells

c) guard cells are present in organs from more primitive plants, such as the liverworts and the mosses

d) dicot plants and nongrass monocots, kidney-shaped guard cells have an elliptical contour with the pore at its center

Which of the following combination of above statement is TRUE?

TLS Online TPP Program

#Question id: 13980

#Unit 6. System Physiology – Plant

The alignment of the cellulose microfibrils in the guard cell is