Ramachandran plots can help increase the accuracy of models derived from x-ray crystallography data. The plot below was created by measuring phi, and psi for each amino acid residue in a 2.2 A resolution crystal structure. In the plot, which excludes Gly and Pro residues, selected residues (dots) are numbered 1 through 5.

Which of the following statements can be correctly stated for this plot in reference to selected residues?

A. Residues 1 and 3 are in either B sheets

B. residue 2 is in a right-handed a helix, and residue 4 is in a left-handed a helix.

C. If residue 5 were Gly, it might be in an acceptable position in the plot

TLS Online TPP Program

#Question id: 12628

#Unit 6. System Physiology – Plant

Brassinosteroids  biosynthesis precursor  is______

TLS Online TPP Program

#Question id: 12629

#Unit 6. System Physiology – Plant

During the biosynthesis of brassinosteroid derived from the sterol campesterol follows two types of the pathway

i) Late C-6 oxidation pathway

ii) Early C-6 oxidation pathway

follows  the different reaction performing in each  pathways such as,

a) Campesterol → Campestanol →6-Deoxoteasterone→ Castasterone→Teasterone →Brassinolide

b) Campesterol → 6-Oxocampestanol →Cathasterone →Teasterone → Castasterone →Brassinolide

c) Campesterol → Campestanol →6-Deoxocathasterone →6-Deoxoteasterone → Castasterone →Brassinolide

Find the correct combination of the each oxidation pathway with its performing sequences;

TLS Online TPP Program

#Question id: 12630

#Unit 6. System Physiology – Plant

Bioactive brassinosteroid levels are also modulated by a variety of inactivation or catabolic reactions, except;

a) epimerization

b) hydroxylation

c) Phosphorylation

d) Sulfonation

e) Ubiquitinylation

f) Conjugation to glucose or lipids

TLS Online TPP Program

#Question id: 12631

#Unit 6. System Physiology – Plant

The receptor  of brassinosteroid are the  largest class of plant receptor kinases, which is localize to the plasma membrane as transmembrane protein;

TLS Online TPP Program

#Question id: 12632

#Unit 6. System Physiology – Plant

In brief, brassinolide binding to the brassinosteroid receptor kinase present on the plasma membrane, these brassinosteroid receptor kinase is,

TLS Online TPP Program

#Question id: 12633

#Unit 6. System Physiology – Plant

In the absence of BRs, BRI1 and BAK1 can form inactive homodimers, which of the following activity is inhibited  these BRs receptor?