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TLS Online TPP Program

#Question id: 179

The average molecular weight of the 20 standard amino acids is 138, but biochemists use 110 when estimating the number of amino acids in a protein of known molecular weight. Why?

#Unit 1. Molecules and their Interaction Relevant to Biology

The number 110 is based on the fact that the average molecular weight of a protein is 110,000 with an average of 1,000 amino acids.
The number 110 reflects the higher proportion of small amino acids in proteins, as well as the loss of water when the peptide bond forms.
The number 110 reflects the number of amino acids found in the typical small protein, and only small proteins have their molecular weight estimated this way.
The number 110 takes into account the relatively small size of nonstandard amino acids.

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TLS Online TPP Program

#Question id: 29117

#Unit 6. System Physiology – Plant

Light reactions of photosynthesis are carried out by four major protein complexes: Photosystem I (PSI), photosystem II (PSII), the cytochrome b6f complex and ATP synthase. The following are certain statements on PSII:

a. Red light absorbed by photosystem II (PSII) produces a strong oxidant and a weak reductant.

b. Far-red light absorbed by photosystem II (PSI) produces a weak oxidant and a strong reductant.

c. The strong oxidant generated by PSII oxidizes water,

d. The strong reductant generated by PSII oxidizes water

Which one of the following combinations of the above statements is correct?

TLS Online TPP Program

#Question id: 29118

#Unit 6. System Physiology – Plant

Which one of the following statements related to photosynthesis is NOT correct?

TLS Online TPP Program

#Question id: 29416

#Unit 6. System Physiology – Plant

Which of the following is not a phase of phases of the Calvin cycle

TLS Online TPP Program

#Question id: 29417

#Unit 6. System Physiology – Plant

The first committed enzymatic step in the Calvin cycle is the reaction of CO2 and water with a five-carbon acceptor molecule is catalyzed by?

TLS Online TPP Program

#Question id: 29418

#Unit 6. System Physiology – Plant

Phases of the Calvin cycle and their catalyzing enzymes and class is given

(a) Carboxylation is catalyzed by rubisco

(b) Carboxylation is catalyzed by PGK and GAPDH

(c) Reduction of 3-phosphoglycerate is catalyzed by PGK and GAPDH

(d) Regeneration is catalyzed by isomerase, aldolases, and epimerases

Choose which of the following is INCORRECT

TLS Online TPP Program

#Question id: 29419

#Unit 6. System Physiology – Plant

The fixation of three molecules of CO2 into one molecule of triose phosphate requires