MCQOPTIONS
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MCQOPTIONS
This section includes 128 Mcqs, each offering curated multiple-choice questions to sharpen your Biochemical knowledge and support exam preparation. Choose a topic below to get started.
| 101. |
What is the holding period (min) at a k value of 3.36 min |
| A. | 10.6 |
| B. | 9.5 |
| C. | 8.4 |
| D. | 7.2 |
| Answer» C. 8.4 | |
| 102. |
A fed batch culture was operated with intermittent addition of glucose solution at a flow rate of 200 ml h |
| A. | 0.1 |
| B. | 1 |
| C. | 0.01 |
| D. | 10 |
| Answer» B. 1 | |
| 103. |
Substrate consumption in lag phase of microbial growth is primarily used for |
| A. | P, Q and S only |
| B. | Q, R and S only |
| C. | P, Q and R only |
| D. | S only |
| Answer» D. S only | |
| 104. |
In balanced growth phase of a cell |
| A. | P, Q and S only |
| B. | Q, R and S only |
| C. | P, Q and R only |
| D. | P only |
| Answer» B. Q, R and S only | |
| 105. |
The residence time required for the steady state reactor operation will be |
| A. | 0.1 h |
| B. | 0.4 h |
| C. | 1.0 h |
| D. | 1.1 h |
| E. | None of these |
| Answer» F. | |
| 106. |
In a well aerated and agitated microbial culture, the supply' of oxygen is equal to demand' (uptake) of the growing culture. The K |
| A. | (r X)/ (C* C) |
| B. | (r)/ X(C* C) |
| C. | (C* C)/ (r X) |
| D. | (X)/ r(C* C) |
| Answer» B. (r)/ X(C* C) | |
| 107. |
A bacterial culture (200 l containing 1.8 10 |
| A. | bacteriostatic |
| B. | bacteriocidal |
| C. | bacteriolytic |
| D. | apoptotic |
| Answer» B. bacteriocidal | |
| 108. |
A bacterial culture with an approximate biomass composition of CH |
| A. | 0.90 |
| B. | 0.95 |
| C. | 1.00 |
| D. | 1.05 |
| Answer» C. 1.00 | |
| 109. |
Diauxic pattern of biomass growth is associated with |
| A. | P, R |
| B. | P, Q |
| C. | R, S |
| D. | Q, S |
| Answer» C. R, S | |
| 110. |
In a chemostat operating under steady state, a bacterial culture can be grown at dilution rate higher than maximum growth rate by |
| A. | partial cell recycling |
| B. | using sub-optimal temperature |
| C. | pH cycling |
| D. | substrate feed rate cyling |
| Answer» B. using sub-optimal temperature | |
| 111. |
A culture of bacteria is infected with bacteriophage at a multiplicity of 0.3. The probability of a single cell infected with 3 phages is |
| A. | 0.9 |
| B. | 0.27 |
| C. | 0.009 |
| D. | 0.027 |
| Answer» E. | |
| 112. |
What would be the yield Y |
| A. | 0.562 |
| B. | 0.462 |
| C. | 0.362 |
| D. | 0.162 |
| Answer» B. 0.462 | |
| 113. |
A callus of 5 g dry weight was inoculated onsemi-solid medium for growth. The dry weight of the callus was found to increase by 1.5 fold after 10 days of inoculation. The growth index of the culture is ______ |
| A. | 2.5 |
| B. | 0.25 |
| C. | 0.5 |
| D. | 25 |
| Answer» D. 25 | |
| 114. |
Determine the correctness or otherwise of the following Assertion (a) and Reason (r): |
| A. | Both (a) and (r) are true and (r) is the correct reason for (a) |
| B. | Both (a) and (r) are true but (r) is not the correct reason for (a) |
| C. | (a) is true but (r) is false |
| D. | (a) is false but (r) is true |
| Answer» D. (a) is false but (r) is true | |
| 115. |
Which of the following statements are true about bioreactors? |
| A. | P, Q |
| B. | Q, S |
| C. | R, S |
| D. | P, R |
| Answer» D. P, R | |
| 116. |
Maximum specific growth rate ( |
| A. | slope of ln X vs t of the growth cycle |
| B. | slope of ln X vs t during the exponential growth phase |
| C. | slope of X vs t |
| D. | slope of X vs t during the exponential phase of growth |
| Answer» C. slope of X vs t | |
| 117. |
If Y |
| A. | 2 g/L |
| B. | 8 g/L |
| C. | 4 g/L |
| D. | 6 g/L |
| Answer» B. 8 g/L | |
| 118. |
Thermal death of microorganisms in the liquid medium follows first order kinetics. If the initial cell concentration in the fermentation medium is 10 |
| A. | 48 min |
| B. | 11 min |
| C. | 110 min |
| D. | 20 min |
| Answer» D. 20 min | |
| 119. |
Match the microbial growth characteristics in Group I with the corresponding features in Group II. |
| A. | P-1 , Q-2 , R-4 , S-3 |
| B. | P-3 , Q-2 , R-1 , S-4 |
| C. | P-2 , Q-1 , R-3 , S-4 |
| D. | P-2 , Q-3 , R-4 , S-1 |
| Answer» C. P-2 , Q-1 , R-3 , S-4 | |
| 120. |
A culture vessels in which physical, physicochemical and physiological conditions, as well as cell concentration, are kept constant is known as |
| A. | Cell concentrator |
| B. | Biostat |
| C. | Batch bioreactor |
| D. | Incubator |
| Answer» C. Batch bioreactor | |
| 121. |
Determine the correctness or otherwise of the following Assertion (A) and the Reason (R). |
| A. | both (A) and (R) are true and (R) is the correct reason for (A) |
| B. | both (A) and (R) are true but (R) is not the correct reason for (A) |
| C. | (A) is true but (R) is false |
| D. | (A) is false but (R) is true |
| Answer» C. (A) is true but (R) is false | |
| 122. |
Structured William's model |
| A. | P, Q and S only |
| B. | P, Q and R only |
| C. | Q, R and S only |
| D. | P, R and S only |
| Answer» C. Q, R and S only | |
| 123. |
A T-flask is seeded with 10 |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» C. 3 | |
| 124. |
Lysine is being produced in a lab-scale reactor by a threonine auxotroph. After 2 weeks of operation it was observed that the concentration of lysine in the reactor was gradually decreasing. Microbiological assays of reactor samples showed absence of contamination and recorded data showed no change in the operating conditions. The most probable reason for decrease in lysine concentration may be attributed to |
| A. | accumulation of ethanol |
| B. | growth of revertants |
| C. | production of citric acid |
| D. | unutilized phosphoenol pyruvate |
| Answer» C. production of citric acid | |
| 125. |
An enzyme converts substrate A to product B. At a given liquid feed stream of flow rate 25 L.min |
| A. | 1986.0 to 1989.0 |
| B. | 986.0 to 989.0 |
| C. | 2443.0 to 2544.0 |
| D. | 4986.0 to 4989.0 |
| Answer» E. | |
| 126. |
Decimal reduction time of bacterial spores is 23 min at 121 C and the death kinetics follow first order. One liter medium containing 10 |
| A. | 3.6 to 3.8 |
| B. | 2.1 to 2.8 |
| C. | 6.3 to 8.3 |
| D. | None of the above |
| Answer» B. 2.1 to 2.8 | |
| 127. |
Saccharomyces cerevisiae is cultured in a chemostat (continuous fermentation) at a dilution rate of 0.5 h |
| A. | 1.15 to 2.25 |
| B. | 9.65 to 10.75 |
| C. | 3.65 to 3.75 |
| D. | All of the above |
| Answer» D. All of the above | |
| 128. |
The empirical formula for biomass of an unknown organism is CH |
| A. | 1.9 to 2.0 |
| B. | 5.9 to 7.2 |
| C. | 1.0 to 1.5 |
| D. | None of the above |
| Answer» B. 5.9 to 7.2 | |