Practice Questions

  1. Home
  2. Free Resources
  3. Practice Questions
  4. 53823
TLS Online TPP Program

#Question id: 28760

Pex5 is a receptor which binds with peroxisomal-targeting sequence proteins in the cytosol that protein targeted into the peroxisomal matrix by forming a multimeric complex with the Pex14 receptor located on the peroxisomal membrane. After assembly, the matrix protein dissociates from Pex5 and Pex5 is then returned to the cytosol by which process?

#Unit 2. Cellular Organization

  1. Pex5 ubiquitinylation by the membrane proteins Pex1 and Pex6, followed by ATP-dependent removal from the membrane by the AAA-ATPase proteins Pex2, Pex10, and Pex12

  2. Modification of membrane-bound Pex5 by methylation, Pex1 and Pex6 recognize methylation Pex5 and use the energy from ATP hydrolysis

  3. Pex5 ubiquitinylation by the membrane proteins Pex2, Pex10, and Pex12, followed by ATP-dependent removal from the membrane by the AAA-ATPase proteins Pex1 and Pex6
  4. Pex5 phosphorylation by the membrane proteins Pex19, followed by removal from the membrane by the proteins Pex6 and Pex7 spontaneously
More Questions
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?
TLS Online TPP Program

#Question id: 10422

#Unit 6. System Physiology – Plant

Arabidopsis contains five genes encoding phytochromes, PHYA–PHYE, four of the five phytochromes appear mostly light-stable in the plant and function primarily in the regulation of LFRs and of shade avoidance involving changes in the R:FR ratio.
TLS Online TPP Program

#Question id: 10423

#Unit 6. System Physiology – Plant

Which of the following responses include processes such as the promotion of lettuce seed germination, inhibition of hypocotyl elongation, and regulation of leaf movements?