At 25°C values of [θ]222, the mean residue ellipticity at 222 nm, are - 33,000 and -3,000 deg cm2 dmol-1 for a polypeptide existing in α- helical (α) and β-structure (β), respectively. If this polypeptide undergoes a two-state heat-induced α-β transition, and a value of [θ]222 =  -15,000 deg cm2 dmol-1 is observed at 60°C, then this observation leads to the conclusion that the α helix conversion to β- structure is:

TLS Online TPP Program

#Question id: 29586

#Unit 6. System Physiology – Plant

When red and far-red light were given together, the rate of photosynthesis was greater than the sum of the individual rates, phenomenon known as 

TLS Online TPP Program

#Question id: 29587

#Unit 6. System Physiology – Plant

Following are given stages of gibberellin biosynthetic pathway;

a) Geranylgeranyl diphosphate (GGPP) is converted to ent-kaurene  via copalyl diphosphate (CPP) in endoplasmic reticulum

b) In the endoplasmic reticulum, conversion of ent-kaurene into GA12 or GA53 depending on whether the GA is hydroxylated at carbon 13

c) the conversion of GA12 or GA53 into other GAs in cytosol proceeds with a series of oxidations at carbon 20

d) GA20 is then oxidized to the active gibberellin, GA1, by a 3β-hydroxylation reaction

Which of the following is the correct statements of GA biosynthesis?

TLS Online TPP Program

#Question id: 29588

#Unit 6. System Physiology – Plant

The induction of GA-MYB and α-amylase mRNA by GA3, the production of GA-MYB  and  α-amylase mRNA has shown in graph, which of the following is the correct representation relation between these two mRNA

TLS Online TPP Program

#Question id: 29589

#Unit 6. System Physiology – Plant

Which one of the following reactions takes place during the reduction phase of the Calvin- Benson cycle?

TLS Online TPP Program

#Question id: 30045

#Unit 6. System Physiology – Plant

In Which of the following enzymes Light regulates the catalytic activity of four enzymes of the Calvin–Benson cycle directly via the ferredoxin– thioredoxin system?

TLS Online TPP Program

#Question id: 30046

#Unit 6. System Physiology – Plant

The oxygenase activity of rubisco produces one molecule each of 3-phosphoglycerate and 2-phosphoglycolate due to this activity a loss of carbon fixed by the Calvin–Benson cycle and yields 2-phosphoglycolate which is a inhibitor of two chloroplast enzymes known as;