Biotechnology
GATE BT topic:biological-engineering PYQs
Build your understanding with focused practice from past exam papers.
How to practice topic:biological-engineering
Attempt a question, record the concept and assumptions, then check the available answer. Rework mistakes after revising the relevant concepts. Topic tags can overlap; review the question context.
Questions 1–10 of 21. Imported answers require independent review unless marked reviewed.
Question 40
Open questionBTMCQ2 marksNeeds review
By elemental analysis of a biomass sample, it was found that the cells in the given sample are composed of (by weight) C=50%, H=8%, O=20%, N=10% and ash content=12%. Which of the following is the correct empirical formula of the ash-free cells, normalized with respect to Nitrogen?
Your answerChoose one option.
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Open questionBTNAT2 marksNeeds review
The electron equivalent per liter (e
eq L
) of acetate ion solution of concentration 10 g L
is ______ e
eq L
. (rounded off to one decimal place)Log in to check the answer
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Open questionBTNAT2 marksNeeds review
It is desired to cultivate 150 mg (dry weight) microbial cells with an empirical formula of C
H
O
N. If the phosphorus requirement for the cells is 20% of the nitrogen requirement (on a weight basis), the minimum amount of phosphorus required to be added to the cultivation medium is _______ mg. (rounded off to one decimal place)Log in to check the answer
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Open questionBTMSQ1 markNeeds review
Which of the following compounds have the same degree of reduction per carbon-mole?
Your answerSelect all correct options. You can choose more than one.
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 58
Open questionBTNAT2 marksNeeds review
In a fermentation process, each mole of glucose is converted to biomass (CH₁.₈O₀.₅N₀.₂), with a biomass yield coefficient of 0.4 C-mol/C-mol, according to the unbalanced equation given below.
C₆H₁₂O₆ + NH₃ + O₂ → CH₁.₈O₀.₅N₀.₂ + CO₂ + H₂O
The moles of oxygen consumption per mole of glucose consumed during fermentation is ________.
(Round off to two decimal places)
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Open questionBTNAT1 markNeeds review
The degree of reduction (reductance) for oxalic acid (
) is ________.Log in to check the answer
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Open questionBTNAT2 marksNeeds review
A fermentor is filled with medium at a rate of 1 L min
. A leak develops at the bottom of the fermentor when the medium in the fermentor reaches 200 L. The rate of medium leakage is
L min
, where ‘t’ is the time at which the leak begins.The volume of medium in the fermentor after 10 min of leakage is ______ L (Answer in integer).
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Open questionBTNAT2 marksNeeds review
The following reaction represents biomass synthesis from hexadecane
C₁₆H₃₄ + 12.5O₂ + 2.13NH₃ → 10.6CH₁.₆₆O₀.₂₇N₀.₂₇ + 5.37CO₂ + 11.4H₂O
where CH₁.₆₆O₀.₂₇N₀.₂₇ represents the biomass. The value of respiratory quotient (rounded off to two decimal places) is __________.
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Open questionBTMCQ1 markNeeds review
The overall stoichiometry for an aerobic cell growth is
What is the elemental composition formula of the biomass?
Your answerChoose one option.
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Open questionBTNAT1 markNeeds review
The degree of reduction of lactic acid (C
H
O
) is ________________.Log in to check the answer
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