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TLS Online TPP Program

#Question id: 2116

When a cell is in equilibrium with its environment, which of the following processes occurs for substances that can diffuse through the plasma membrane?

#SCPH28 | Zoology

  1. There is directed movement of substances into and out of the cell.

  2. There is random movement of substances into and out of the cell.

  3. There is no movement of substances into or out of the cell.

  4. All movement of molecules across the plasma membrane occurs by active transport.

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TLS Online TPP Program

#Question id: 15466

#SCPH05 I Biotechnology

Water at 25°C enters an open heating tank at a rate of 10 kg h-1. Liquid water leaves the tank at 88°C at a rate of 9 kg h-1; 1 kg h-1 water vapour is lost from the system through evaporation. At steady state, what is the rate of heat input to the system?
h (liquid water at 25°C = 104.8 kJ kg-1) 
h (liquid water at 88°C = 368.5 kJ kg-1) 
h (saturated steam at 88°C = 2656.9 kJ kg-1)
TLS Online TPP Program

#Question id: 15467

#SCPH05 I Biotechnology

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
TLS Online TPP Program

#Question id: 15468

#SCPH05 I Biotechnology

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

#SCPH05 I Biotechnology

What is the rate of heat loss from the gluconic acid solution to the surroundings? 
TLS Online TPP Program

#Question id: 15470

#SCPH05 I Biotechnology

In the stoichiometric equation given below identify which one of the following corresponds to oxygen balance:
CwHxOyNz + aO2 + bHgOhNi cCHαOβNδ + dCO2 + eH2O
TLS Online TPP Program

#Question id: 15471

#SCPH05 I Biotechnology

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