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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
  1. flow of protons from the thylakoid lumen  into the stroma is coupled to release of Mg2+ from the intrathylakoid space to the stroma
  2. 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
  3. 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
  4. The modifications of ionic composition of the chloroplast stroma are reversed rapidly upon darkening
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TLS Online TPP Program

#Question id: 9577

#Unit 10. Ecological Principles

The epidermal coloration of the African grasshopper is a striking example of irreversible developmental responses to environmental conditions. Which of the following statements is true?
TLS Online TPP Program

#Question id: 9578

#Unit 10. Ecological Principles

Bergmann’s rule states that,
TLS Online TPP Program

#Question id: 9579

#Unit 10. Ecological Principles

Allen’s rule states that,
TLS Online TPP Program

#Question id: 9580

#Unit 6. System Physiology – Plant

Many Antenna Complexes Have a common structural motif In all eukaryotic photosynthetic organisms that contain both chlorophyll a and chlorophyll b, the most abundant antenna proteins are members of a large family of structurally related proteins, some of these proteins are associated with PSI and PSII such as LHCI and LHCII , Select the incorrect one regarding LHC complexes;
TLS Online TPP Program

#Question id: 9581

#Unit 6. System Physiology – Plant

These four Photosystem II, Cytochrome b6 f, Photosystem I and ATP synthase integral membrane complexes are vectorially oriented in the thylakoid membrane to function as follows, find out the incorrect statements;
TLS Online TPP Program

#Question id: 9582

#Unit 6. System Physiology – Plant

Electrons ejected from chlorophyll travel through a series of electron carriers organized in the “Z Scheme” shows a current version of the Z scheme, in which all the electron carriers known to function in electron flow from H2O to NADP Presented in the following sequence;

a.) P680 reduce by Yz has received electrons from oxidation of water P680→P680*→pheophytin→ plastoquinones→ cytochrome b6 f complex→ plastocyanin→ in turn reduces (PSI) P700+

b.) P700+→ P700*→ membrane-bound iron–sulfur proteins → A0→ A1 → flavoprotein ferredoxin–NADP reductase (FNR) soluble → ferredoxin(Fd) → NADP+ to NADPH

c.) P700+→ P700*→ A0→ A1→ membrane-bound iron–sulfur proteins→ ferredoxin(Fd)→ soluble flavoprotein ferredoxin–NADP reductase (FNR)→ NADP+ to NADPH

d.) P680 reduce by Yz has received electrons from oxidation of water P680→P680*→ plastoquinones → pheophytin → cytochrome b6 f complex→ plastocyanin→ in turn reduces (PSI) P700+

Which one of the following combinations is correct?