Practice Questions

TLS Online TPP Program

#Question id: 10146

Light-dependent ion movements modulate enzymes of the Calvin–Benson cycle such as : rubisco, fructose 1,6-bisphosphatase, sedoheptulose 1,7-bisphosphatase, and phosphoribulokinase what will happen Upon illumination;

#Unit 6. System Physiology – Plant

flow of protons from the thylakoid lumen into the stroma is coupled to release of Mg2+ from the intrathylakoid space to the stroma
light actuated ion fluxes decrease the stromal concentration of protons (the pH increases from 7 to 8) and decrease that of Mg2+ by 2 to 5 mM
The light-mediated decrease of pH and the concentration of Mg2+ activate enzymes of the Calvin–Benson cycle that require Mg2+ for catalysis and are more active at pH 7 than at pH 8
The modifications of ionic composition of the chloroplast stroma are reversed rapidly upon darkening

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TLS Online TPP Program

#Question id: 31105

#Unit 2. Cellular Organization

Phalloidin isolated from Amanita phalloides, binds at the interface between subunits in F-actin involves:

TLS Online TPP Program

#Question id: 31106

#Unit 2. Cellular Organization

Which of the following protein can bind other proteins with sequences rich in proline residues at the same time it is binding actin?

TLS Online TPP Program

#Question id: 31107

#Unit 2. Cellular Organization

Which of the following small protein involved in actin treadmilling, but it binds specifically to F-actin in which the subunits contain ADP?

TLS Online TPP Program

#Question id: 31108

#Unit 2. Cellular Organization

Match the following proteins (column A) with their functions (column B)

TLS Online TPP Program

#Question id: 31109

#Unit 2. Cellular Organization

Formins are activated by:

TLS Online TPP Program

#Question id: 31110

#Unit 2. Cellular Organization

To nucleate the assembly of unbranched actin filaments, Arp2/3 requires: