TLS Online TPP Program

#Question id: 2882


SUMO (small ubiquitin-related modifier) proteins are ∼10-kD polypeptides that function as reversible post-translational protein modifiers. They form isopeptide bonds with ɛ-amino groups of acceptor Lys residues in hundreds of target proteins in a process termed as sumoylation. Which of the following statements is correct regarding this modification?

#Unit 2. Cellular Organization
  1. A short non-covalent SUMO-interaction/binding motif (SIM/SBM) has been identified in all SUMO enzymes, targets and downstream effectors. This motif contributes to the mechanism and consequences of sumoylation.

  2. Acceptor Lys residues in target proteins are frequently found in the consensus motif ΨKxD although the number of targets with non-consensus acceptor sites is steadily increasing.

  3. Irreversible sumoylation contributes to many distinct pathways, such as chromatin structure, DNA repair, transcription, cell-cycle progression and trafficking.

  4. Sumoylation alters the molecular interactions of modified target proteins by masking or adding interaction surfaces. Downstream consequences, which are target dependent, include changes in localization, activity and protein stability.

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TLS Online TPP Program

#Question id: 9283

#Unit 6. System Physiology – Plant

Organization of the protein complexes the photosystems I and II Are spatially separated in the thylakoid membrane, choose the correct arrangement of PSI and PSII on the membrane ;

a.) The PSI reaction centre and its associated antenna pigments and electron transfer proteins, as well as the coupling-factor enzyme that catalyzes the formation of ATP, are found almost exclusively in the stroma lamellae and at the edges of the grana lamellae

b.) The PSI reaction centre, along with its antenna chlorophylls and associated electron transport proteins, is located predominantly in the stromal lamellae

c.) The PSII reaction centre and its associated antenna pigments and electron transfer proteins, as well as the coupling-factor enzyme that catalyzes the formation of ATP, are found almost exclusively in the stroma lamellae and at the edges of the grana lamellae

d.) The PSII reaction centre, along with its antenna chlorophylls and associated electron transport proteins, is located predominantly in the grana lamellae

Which of the following given combination correct?

TLS Online TPP Program

#Question id: 9284

#Unit 6. System Physiology – Plant

Following are some facts regarding spatial separation of PSI and PSII. Which one would be INCORRECT?

TLS Online TPP Program

#Question id: 9285

#Unit 6. System Physiology – Plant

Non-O2-evolving (anoxygenic) organisms, contain only a single photosystem such as

TLS Online TPP Program

#Question id: 9566

#Unit 10. Ecological Principles

Which of the following adaptations helps kangaroo  rats conserve water?

TLS Online TPP Program

#Question id: 9567

#Unit 10. Ecological Principles

Which part of the electromagnetic spectrum is the photosynthetically active region?

TLS Online TPP Program

#Question id: 9568

#Unit 10. Ecological Principles

Which of the following represents a plant adaptation that minimizes water loss in arid environments by increasing the thickness of the boundary layer?