Basic Principles Of Biotechnology - Study Mode
[#1] Phase contrast microscope takes advantage of
Correct Answer
(A) Density of different parts of a cell
[#2] Measurement of K L a in a bioreactor can be carried out by sodium sulfite oxidation method, that is, based on the oxidation of sodium sulfite to sodium sulfate in the presence of a catalyst (Cu ++ or Co ++ ). In a typical experiment, a laboratory fermenter was filled with 5 liter of 0.5 M sodium sulfite solution containing 0.003 M Cu ++ ions and the air was sparged in. After 10 min, the air flow was stopped and a 10 mL sample was taken and titrated. The concentration of sodium sulfite in the sample was found to be 0.20 M. The oxygen uptake rate for this aerated system will work out to be
Correct Answer
(B) 0.008 g L -1 s -1
[#3] In a well aerated and agitated microbial culture, the 'supply' of oxygen is equal to 'demand' (uptake) of the growing culture. The K L a for such a system will be (K L a = volumetric mass transfer coefficient, C* = dissolved oxygen concentration in liquid in equilibrium with gaseous oxygen, C = instantaneous value of dissolved oxygen concentration, 'r' = specific oxygen uptake rate per unit weight of cells, X = dry weight of the cells per unit volume)
Correct Answer
(A) $$frac{{left( {rX}
ight)}}{{left( {C* - C}
ight)}}$$
[#4] Glycogen is a branched polymer of glucose It has
Correct Answer
(C) One reducing end and several non-reducing ends
[#5] Shear stress versus shear rate behavior of four different types of fluids (I, II, III and IV) are shown in the figure below. Which one of the following options is correct?
Correct Answer
(D) I-Newtonian, II-Bingham plastic, III-Pseudoplastic, IV-Dilatant