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TLS Online TPP Program

#Question id: 9588

The light-absorbing antenna systems are organised in different manner, which of the following statements about antenna would be Incorrect?

#Section 2: General Biology
  1. The antenna systems of different classes of photosynthetic organisms are almost same , in contrast to the reaction centre, which appear to be similar in even distantly related organisms
  2. The variety of antenna complexes reflects evolutionary adaptation to the diverse environments in which different organisms live, as well as the need in some organisms to balance energy input to the two photosystems
  3. The size of the antenna system varies considerably in different organisms, ranging from a low of 20 to 30 bacteriochlorophylls per reaction centre to generally 200 to 300 chlorophylls per reaction centre
  4. The molecular structures of antenna pigments are associated in some way with the photosynthetic membrane, In almost all cases, the antenna pigments are associated with proteins to form pigment–protein complexes
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TLS Online TPP Program

#Question id: 16859

#General Aptitude

I……… (write) to her last week.
TLS Online TPP Program

#Question id: 1971

#Section 2: General Biology

If a newborn were accidentally given a drug that destroyed the thymus, what would most likely happen?
TLS Online TPP Program

#Question id: 21162

#Section 5: Bioprocess Engineering and Process Biotechnology

A first order homogeneous reaction of the type X  Y  Z (consecutive reaction) is carried out in a CSTR. Which of the following curves respectively show the variation of the concentration of X, Y and Z with time?
TLS Online TPP Program

#Question id: 14302

#Section 5: Bioprocess Engineering and Process Biotechnology

Pseudomonas sp. has a mass doubling time of 2.4 h when grown on acetate. The saturation constant using this substrate is 1.3 g/l (which is unusually high), and cell yield on acetate is 0.46 g cell/g acetate. If we operate a chemostat on a feed stream containing 38 g/l acetate, find the Substrate concentration when the dilution rate is 0.8Dmax?

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TLS Online TPP Program

#Question id: 14403

#Section 5: Bioprocess Engineering and Process Biotechnology

Invertase is immobilised in ion-exchange resin of average diameter 1 mm. The amount of enzyme in the beads is measured by protein assay as 0.05 kg m ^-3. 20 cm ^3 beads are packed into a small column reactor; 75 ml sucrose solution at a concentration of 16 mM is pumped rapidly through the bed. In another reactor an identical quantity of free enzyme is mixed into the same volume of sucrose solution. Assume the kinetic parameters for free and immobilised enzyme are equal: K,,, is 8.8 mM and the turnover number is 2.4 x 10 gmol glucose (g enzyme)-'s^-1. The effective diffusivity of sucrose in the ion-exchange resin is 2 x 10^-6cm2s 4. What is the rate of reaction by free enzyme?