TLS Online TPP Program

#Question id: 3869


Which one of the following statements about E. coli RNA polymerase (core enzyme) is false?

#Section 3: Genetics, Cellular and Molecular Biology
  1. It can start new chains de novo or elongate old ones.

  2. It has no catalytic activity unless the sigma factor is bound.

  3. It uses nucleoside 5'-triphosphates as substrates.

  4. Its activity is blocked by rifampicin.

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TLS Online TPP Program

#Question id: 14168

#Section 5: Bioprocess Engineering and Process Biotechnology

Corn-steep liquor contains 2.5 % invert sugars and 50% water; the rest can be considered solids. Beet molasses containing 50% sucrose, 1% invert sugars, 18% water and the remainder solids, is mixed with corn-steep liquor in a mixing tank. Water is added to produce a diluted sugar mixture containing 2% (w/w) invert sugars. 125 kg corn-steep liquor and 45 kg molasses are fed into the tank.

What is the concentration of solids in the final mixture?

TLS Online TPP Program

#Question id: 14169

#Section 4: Fundamentals of Biological Engineering

Unsweetened condensed milk is a shelf-stable canned milk product. If 100kg of fresh milk, containing 87% water and the rest milk solids, is condensed using an evaporator to remove 60% of the water from the fresh milk, calculate:

 The mass of water evaporated


TLS Online TPP Program

#Question id: 14169

#Section 5: Bioprocess Engineering and Process Biotechnology

Unsweetened condensed milk is a shelf-stable canned milk product. If 100kg of fresh milk, containing 87% water and the rest milk solids, is condensed using an evaporator to remove 60% of the water from the fresh milk, calculate:

 The mass of water evaporated


TLS Online TPP Program

#Question id: 14170

#Section 4: Fundamentals of Biological Engineering

Unsweetened condensed milk is a shelf-stable canned milk product. If 100kg of fresh milk, containing 87% water and the rest milk solids, is condensed using an evaporator to remove 60% of the water from the fresh milk, calculate:

The final mass and composition of condensed milk produced


TLS Online TPP Program

#Question id: 14170

#Section 5: Bioprocess Engineering and Process Biotechnology

Unsweetened condensed milk is a shelf-stable canned milk product. If 100kg of fresh milk, containing 87% water and the rest milk solids, is condensed using an evaporator to remove 60% of the water from the fresh milk, calculate:

The final mass and composition of condensed milk produced


TLS Online TPP Program

#Question id: 14171

#Section 4: Fundamentals of Biological Engineering

The growth of baker’s yeast (S. cerevisiae) on glucose may be simply described by the following equation:

In a batch reactor of volume 10^5 l, the final desired yeast concentration is 50 gdw/l. Using the above reaction stoichiometry. Determine the concentration and total amount of glucose in the nutrient medium?