PYR/PYL/RCAR  receptors  to permit or enhance interaction with PP2C and thereby repress PP2C phosphatase activity. This releases SnRK2 kinases from inhibition and allow to performing various function such as;

a) phosphorylating transcription factors that bind ABA Response Elements to inhibits the ABA responsive gene expression 

b) Allow phosphorylation  ion channels for regulating  stomatal aperture 

c) phosphorylating transcription factors that bind ABA Response Elements to activates the ABA responsive gene expression

which of the following is the correct statement  of  kinase activity ?

TLS Online TPP Program

#Question id: 33355

#Unit 1. Molecules and their Interaction Relevant to Biology

Which statement stands incorrect

TLS Online TPP Program

#Question id: 33356

#Unit 1. Molecules and their Interaction Relevant to Biology

Hemoglobin undergoes substantial changes in quaternary structure on oxygen binding: the a1b1 and a2b2 dimers rotate with respect to each other by

TLS Online TPP Program

#Question id: 33357

#Unit 1. Molecules and their Interaction Relevant to Biology

Protein A has a binding site for ligand X with a Kd of 10^-6 µM. Protein B has a binding site for ligand X with a Kd of 10^-9 µM. Which statement is incorrect?

TLS Online TPP Program

#Question id: 33358

#Unit 1. Molecules and their Interaction Relevant to Biology

Which of the following situations would produce a Hill plot with n<  1.0?

(a) The protein has multiple subunits, each with a single ligand-binding site. Binding of ligand to one site decreases the binding affinity of other sites for the ligand.

(b) The protein is a single polypeptide with two ligand-binding sites, each having a different affinity for the ligand.

(c) The protein is a single polypeptide with a single ligand-binding site.

TLS Online TPP Program

#Question id: 33359

#Unit 1. Molecules and their Interaction Relevant to Biology

The protein calcineurin binds to the protein calmodulin with an association rate of 8.9 X10³ M^-1s^-1 and an overall dissociation constant, Kd, of 10 nM. The dissociation rate, kd

TLS Online TPP Program

#Question id: 33360

#Unit 1. Molecules and their Interaction Relevant to Biology

a. HbS (sickle-cell Hb): substitutes a Val for a Glu on the surface

b. Hb Cowtown: eliminates an ion pair involved in T-state stabilization

c. Hb Memphis: substitutes one uncharged polar residue for another of similar size on the surface

d. Hb Bibba: substitutes a Pro for a Leu involved in an α helix

Which Hb variant least likely to cause pathological symptoms