In general, proteins whose folding is chaperone-dependent pass down a pathway in which of the following acts first

TLS Online TPP Program

#Question id: 10416

#Unit 6. System Physiology – Plant

Phytochromes  involved  in  red/far‐red  response  are  dimeric  chromoproteins contains N-terminal and C-terminal moiety have domains, which perform various functions such as;

a) Photochromobillin attach with the N-terminal GAF domain, it is an enzyme which causes isomerisation activity in the phytochromobilin

b) PAS-GAF-PHY is a photosensory domain

c) PAS domain perform the lyase activity at C-14 and C-15, which creates a double bond

d) PRD is PAS related domain which involve in import of Phy-B in the nucleus

Which of the following combinations of domain functions is incorrect?

TLS Online TPP Program

#Question id: 10417

#Unit 6. System Physiology – Plant

Red and far-red lights are perceived by plants through various photoreceptors including phytochromes. What is the effect of red light in a variety of higher and lower plants?

a) It promotes germination and growth

b) It promotes de-etiolation

c) promotes internode elongation and flowering

d) It promotes the production of anthocyanin

e) Inhibits orientation of chloroplasts to directional dim light

Which of the following statements of effect of red light is incorrect?

TLS Online TPP Program

#Question id: 10418

#Unit 6. System Physiology – Plant

What is the reason behind that the PAS-related domain (PRD) is only present in the Plant phytochrome, but absent in cyanobacterial Cph1 and Bacterial BphP?

TLS Online TPP Program

#Question id: 10419

#Unit 6. System Physiology – Plant

The conversion of Pr to Pfr by red light, both phyA and phyB move from the cytosol into the nucleus in a light-dependent fashion.

a) Both have nuclear localization signal (NLS) sequences

b) PRD domain of phyB can potentially serve as an NLS, but it is apparently masked in the Pr form

c) phyA dependent on other proteins, such as FAR-RED ELONGATED HYPOCOTYL1 (FHY1) facilitating phyA’s transport it into the nucleus

d) Both phyA and phyB have PRD domain serve as an NLS and responsible for import into the nucleus only in pfr form may expose the functional NLS of the PRD domain

Which of the following factors is involved for transporting phyA and B into the nucleus?

TLS Online TPP Program

#Question id: 10420

#Unit 6. System Physiology – Plant

 A toggle model has been proposed for phytochrome interconversion, according to this model which option is correct?

TLS Online TPP Program

#Question id: 10421

#Unit 6. System Physiology – Plant

The red light-induced rotation of the D ring of the chromophore causes the hairpin to become helical, which of the following β-hairpin changes conformation after rotation?