Recent questions without answers

In an aerobic fermentation with air sparging, which of the following options can be used to increase the volumetric mass transfer coefficient for oxygen transfer?Using pu...

For a liquid flowing in a circular cross section pipe, the transition from laminar to turbulent flow will NOT depend on which of the following factor(s)?The diameter of t...

Which of the following is/are posttranslational modification(s) involved in epigenetic control of gene expression?Arginine methylationLysine acetylationCytosine methylati...

For an ideal plug flow reactor, which of the following statements is/are true?It can be approximated by a large number of ideal continuous stirred tank reactors connected...

An enzyme-catalyzed reaction is found to have $\Delta \mathrm{G}=-100 \mathrm{~kJ} \mathrm{~mol}^{-1}$. Which of the following statements about this reaction is/are true?...

Consider the equation $\dfrac{d y}{d x}=\dfrac{1}{x}$The value of the integral $\int_{1}^{2} d y$ using trapezoidal method and interval $h=0.25$ is $\_\_\_\_$. (rounded o...

If the straight lines given by the following two equations are parallel to each other, the value of $\boldsymbol{a}$ is $\_\_\_\_$. (answer in integer)\[4 x+7 y=6 ; \quad...

A straight line $y=x-1$ intersects a circle with center at $x=1, y=1$ and radius of magnitude $1$ at two points. The length of the chord formed by this intersection is $\...

A heat exchanger during operation in a bioprocess has a steady temperature of $90^{\circ} \mathrm{C}$. After completion of its operation, it was shut down and it was obse...

A microbial culture (following Monod model for growth) has a maximum specific growth rate of $0.1 \mathrm{~h}^{-1}$, Monod constant of $1 \mathrm{mg} \mathrm{L}^{-1}$ and...

A $\text{CSTR}$ with a volume of $100 \mathrm{~m}^{3}$ is operated in cell recycle mode. At a volumetric flow rate of $10 \mathrm{~m}^{3}$ day ${ }^{-1}$ and effluent bio...

The electron equivalent per liter (e-eq $\mathrm{L}^{-1}$ ) of acetate ion solution of concentration $10 \mathrm{~g} \mathrm{~L}^{-1}$ is $\_\_\_\_$ $\mathrm{e}^{-} \math...

From the following plot of $\dfrac{d y}{d x}$ versus $x$ and if $y(2)=5$, the value of $y(3)$ is $\_\_\_\_$. (rounded off to one decimal place) 

A batch sterilizer is being operated at $121^{\circ} \mathrm{C}$ for sterilizing a medium containing microbial cells. Assume that the thermal deactivation of cells is a f...

A substrate is consumed in a zero order reaction such that its concentration falls from $42 \mathrm{~g} \mathrm{~L}^{-1}$ to $14 \mathrm{~g} \mathrm{~L}^{-1}$ in $4$ hour...

A microbe that follows Monod growth kinetics on a limiting substrate (maximum specific growth rate of $0.5 \mathrm{~h}^{-1}$ and Monod constant of $0.1 ~\mathrm{mg} \math...

It is desired to cultivate $150$ mg (dry weight) microbial cells with an empirical formula of $\mathrm{C}_{5} \mathrm{H}_{7} \mathrm{O}_{2} \mathrm{~N}$. If the phosphoru...

In the process of generating a clonal mammalian cell line, a single cell was seeded in a well of a cell culture plate. After the first $48$ hours, one of the progeny cell...

A disease-associated allele shows $\text{X}$-linked recessive inheritance. If the mother is a carrier of the disease, the father is genetically normal and the child born ...

A packed bed bioreactor with length $1 \text{~m}$ and inside diameter $10 \text{~cm}$ has liquid flowing at an interstitial velocity of $1 \mathrm{~cm} \mathrm{~s}^{-1}$....

​​​​​As the police officer was found guilty of embezzlement, he was $\_\_\_\_\_$ dismissed from the service in accordance with the Service Rules.Select the most appropria...

​​​​​The sum of the following infinite series is:$$ \frac{1}{1!}+\frac{1}{2!}+\frac{1}{3!}+\frac{1}{4!}+\frac{1}{5!}+\cdots $$$\pi$$1+e$$e-1$$e$

​​​​​A thin wire is used to construct all the edges of a cube of $1 \: \mathrm{m}$ side by bending, cutting and soldering the wire. If the wire is $12 \: \mathrm{m}$ lon...

​​​​​​The figures $I$, $II$ and $III$ are parts of a sequence. Which one of the following options comes next in the sequence at $IV$?

​​​​​"Why do they pull down and do away with crooked streets, I wonder, which are my delight, and hurt no man living? Every day the wealthier nations are pulling down one...

​​Rohit goes to a restaurant for lunch at about $1$ $\text{PM}$. When he enters the restaurant, he notices that the hour and minute hands on the wall clock are exactly co...

​​​​​A color model is shown in the figure with color codes: Yellow (Y), Magenta (M), Cyan (Cy), Red (R), Blue (Bl), Green (G), and Black (K).Which one of the following op...

​​​​​​A circle with center at $(x, y)=(0.5,0)$ and radius $=0.5$ intersects with another circle with center at $(x, y)=(1,1)$ and radius $=1$ at two points. One of the po...

​​​​​​An object is said to have an $n$-fold rotational symmetry if the object, rotated by an angle of $\frac{2 \pi}{n}$, is identical to the original.Which one of the fol...

​​​​The minimum value of the function$$ f(x)=x+\frac{4}{x} $$for $x>0$ is$1$$2$$3$$4$

​​​​​The diversity in $T$-cell receptors is generated bygene rearrangementssomatic hypermutation of rearranged $V$ regiongene conversionclass switching

​​​​Which one of the following is true for piRNAs?piRNAs silence transposable elements in germ cellspiRNA is the abbreviation of $P$-element interacting RNApiRNAs modify ...

​​​​Which one of the following coenzymes is utilised by alanine racemase for the conversion of $L$-Alanine to $D$-Alanine?Pyridoxal phosphateThiamine pyrophosphateTetrahy...

​​​​​Which one of the following hosts is used in mammalian cell culture for the production of glycosylated recombinant therapeutic proteins?Pichia pastorisSf$9$ cellsEsch...

​​​​Which of the following features is/are used to distinguish Archaea from Bacteria?Gram-stainingPeptidoglycan in the cell wallPresence of N -acetylglucosamine$16 S$ rRN...

​​​​Which of the following enzymes is/are involved in the biogenesis of miRNA?DroshaCas$9$XRCC$4$Dicer

​​​​​​Which of the following separation processes is/are based on molecular size?Size-exclusion chromatographyIon exchange chromatographyMembrane ultrafiltrationUltracent...

​​Which of the following show(s) optical activity at $100 \: \mathrm{mM}$ concentration in water?Solution of NaClSolution of D-GlucoseSolution of GlycineSolution of L-Pro...

​​​Which of the following compounds have the same degree of reduction per carbon-mole?GlucoseLactic acidAcetic acidFormic acid

​​​​A recombinant protein is secreted extracellularly in soluble form by an $E. coli$ culture. Which of the following downstream processes is/are involved in the purifica...