DNA exists in a double-stranded form whereas RNA is mainly a single stranded molecule. What is the likely reason for DNA being double stranded?

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#Question id: 15467

#Section 4: Fundamentals of Biological Engineering

Fumaric acid is produced from Malic acid using Fumarase. Calculate standard heat of reaction for the following transformation:

C₄H₆O₅ → C₄H₄O₄ + H₂O

Given: (Δhc°)malic acid= -1328.8 kJ/gmol 

   (Δhc°)Fumaric acid= -1334.0 kJ/gmol

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#Question id: 15468

#Section 4: Fundamentals of Biological Engineering

In downstream processing of gluconic acid, concentrated fermentation broth containing 20% (w/w) gluconic acid is cooled in a heat exchanger prior to crystallisation. 2000 kg h^-1 liquid leaving an evaporator at 90°C must be cooled to 6°C. Cooling is achieved by heat exchange with 2700 kg h^-1 water initially at 2°C. The final temperature of the cooling water is 50°C. 

Assume (heat capacity of gluconic acid is 0.35 cal g^-1 °C^-1).

h (liquid water at 90°C = 376.9 kJ kg^-1)

h (liquid water at 6°C = 25.2 kJ kg^-1)

h (liquid water at 2°C = 8.4 kJ kg^-1 )

h (liquid water at 50°C = 209.3 kJ kg^-1)

h (gluconic acid at 90°C=0)

How much heat is removed to the cooling water?

TLS Online TPP Program

#Question id: 15469

#Section 4: Fundamentals of Biological Engineering

What is the rate of heat loss from the gluconic acid solution to the surroundings? 

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#Question id: 15470

#Section 4: Fundamentals of Biological Engineering

In the stoichiometric equation given below identify which one of the following corresponds to oxygen balance:

CwHxOyNz + aO2 + bHgOhNi cCHαO_βN_δ + dCO₂ + eH₂O

TLS Online TPP Program

#Question id: 15471

#Section 4: Fundamentals of Biological Engineering

Which one of the following need NOT be conserved in a biochemical reaction?

TLS Online TPP Program

#Question id: 15472

#Section 4: Fundamentals of Biological Engineering

The mass of 1 kmol of oxygen molecules is