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241
GATE2019: 37
Which one of the following amino acid residues will destabilize an $\alpha$-helix when inserted in the middle of the helix? Pro Val lIe Leu
Which one of the following amino acid residues will destabilize an $\alpha$-helix when inserted in the middle of the helix?ProVallIeLeu
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242
GATE2019: 38
What is the solution of the differential equation $\dfrac{\mathrm{dy} }{\mathrm{d} x}=\dfrac{x}{y}$, with the initial condition, at $x=0, y=1?$ $x^{2}=y^{2}+1$ $y^{2}=x^{2}+1$ $y^{2}=2x^{2}+1$ $x^{2}-y^{2}=0$
What is the solution of the differential equation $\dfrac{\mathrm{dy} }{\mathrm{d} x}=\dfrac{x}{y}$, with the initial condition, at $x=0, y=1?$$x^{2}=y^{2}+1$$y^{2}=x^{2}...
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gate2019
differential-equations
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243
GATE2019: 39
The Laplace transform of the function $f\left ( t \right )=t^{2}+2t+1$ is $\dfrac{1}{s^{3}}+\dfrac{3}{s^{2}}+\dfrac{1}{s} \\$ $\dfrac{4}{s^{3}}+\dfrac{4}{s^{2}}+\dfrac{1}{s} \\$ $\dfrac{1}{s^{3}}+\dfrac{2}{s^{2}}+\dfrac{1}{s} \\$ $\dfrac{2}{s^{3}}+\dfrac{2}{s^{2}}+\dfrac{1}{s}$
The Laplace transform of the function $f\left ( t \right )=t^{2}+2t+1$ is $\dfrac{1}{s^{3}}+\dfrac{3}{s^{2}}+\dfrac{1}{s} \\$$\dfrac{4}{s^{3}}+\dfrac{4}{s^{2}}+\dfrac{1}{...
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gate2019
differential-equations
laplace-transforms
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244
GATE2019: 40
Which of the following factors can influence the lag phase of a microbial culture in a batch fermentor? Inoculum size Inoculum age Medium composition $P$ and $Q$ only $Q$ and $R$ only $P$ and $R$ only $P, Q$ and $R$
Which of the following factors can influence the lag phase of a microbial culture in a batch fermentor?Inoculum sizeInoculum ageMedium composition$P$ and $Q$ only$Q$ and ...
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245
GATE2019: 41
Which one of the following statements is $CORRECT$ about proportional controllers? The initial change in control output signal is relatively slow The initial corrective action is greater for larger error They have no offset There is no corrective action if the error is a constant
Which one of the following statements is $CORRECT$ about proportional controllers?The initial change in control output signal is relatively slowThe initial corrective act...
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246
GATE2019: 42
Match the instruments in $Group\; I$ with their corresponding measurements in $Group\; II$ ... $P-3, Q-4, R-1, S-2$ $P-2, Q-4, R-1, S-3$ $P-2, Q-1, R-4, S-3$
Match the instruments in $Group\; I$ with their corresponding measurements in $Group\; II$.$$\begin{array}&&\textbf{Group I} & \textbf{Group II} \\ &\text{P. Manometer} ...
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247
GATE2019: 43
Which of the following statements is $ALWAYS\; CORRECT$ about an ideal chemostat? Substrate concentration inside the chemostat is equal to that in the exit stream Optimal dilution rate is lower than critical dilution rate Biomass concentration increases with increase in dilution rate Cell recirculation facilitates ... $Q$ only $P, R$ and $S$ only $P$ and $S$ only $P, Q$ and $S$ only
Which of the following statements is $ALWAYS\; CORRECT$ about an ideal chemostat?Substrate concentration inside the chemostat is equal to that in the exit streamOptimal d...
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248
GATE2019: 44
Determine the correctness or otherwise of the following Assertion $[a]$ and the Reason $[r]$ Assertion $[a]$ : It is possible to regenerate a whole plant from a single plant cell. Reason $[r]$ : It is easier to introduce transgenes in to plants than animals. Both $[a]$ and $[r]$ ... $[a]$ Both $[a]$ and $[r]$ are false $[a]$ is true but $[r]$ is false
Determine the correctness or otherwise of the following Assertion $[a]$ and the Reason $[r]$Assertion $[a]$ : It is possible to regenerate a whole plant from a single pla...
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249
GATE2019: 45
A UV-visible spectrophotometer has a minimum detectable absorbance of $0.02$. The minimum concentration of a protein sample that can be measured reliably in this instrument with a cuvette of $1cm$ path length is _________$\mu M$ . The molar extinction coefficient of the protein is $10,000\;L\:mol^{-1}\:cm^{-1}$.
A UV-visible spectrophotometer has a minimum detectable absorbance of $0.02$. The minimum concentration of a protein sample that can be measured reliably in this instrume...
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gate2019
numerical-answers
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250
GATE2019: 46
The difference in concentrations of an uncharged solute between two compartments is $1.6$-fold. The energy required for active transport of the solute across the membrane separating the two compartments is _________ $cal\:mol^{-1}$ (rounded off to the nearest integer). $(R =1.987\:cal\:mol^{-1}\:K^{-1},\:T=37 \;^{\circ}C)$
The difference in concentrations of an uncharged solute between two compartments is $1.6$-fold. The energy required for active transport of the solute across the membrane...
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251
GATE2019: 47
In pea plants, purple color of flowers is determined by the dominant allele while white color is determined by the recessive allele. A genetic cross between two purple flower bearing plants results in an offspring with white flowers. The probability that the third offspring from these parents will have purple flowers is ____________ (rounded off to $2$ decimal places).
In pea plants, purple color of flowers is determined by the dominant allele while white color is determined by the recessive allele. A genetic cross between two purple fl...
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252
GATE2019: 48
The molecular mass of a protein is $22\:kDa$. The size of the $\text{cDNA}$ (excluding the untranslated regions) that codes for this protein is __________ $kb$ (rounded off to $1$ decimal place).
The molecular mass of a protein is $22\:kDa$. The size of the $\text{cDNA}$ (excluding the untranslated regions) that codes for this protein is __________ $kb$ (rounded o...
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253
GATE2019: 49
A new game is being introduced in a casino. A player can lose Rs. $100$, break even, win Rs. $100$, or win Rs. $500$. The probabilities $(P(X))$ of each of these outcomes $(X)$ ... $\sigma$) for the casino payout is Rs. _____________ (rounded off to the nearest integer).
A new game is being introduced in a casino. A player can lose Rs. $100$, break even, win Rs. $100$, or win Rs. $500$. The probabilities $(P(X))$ of each of these outcomes...
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254
GATE2019: 51
Yeast biomass $\left ( C_{6}H_{10}O_{3}N \right )$ grown on glucose is described by the stoichiometric equation given below: $C_{6}H_{12}O_{6}+0.48\:NH_{3}+3\:O_{2} \to 0.48\:C_{6}H_{10}O_{3}N+3.12\:CO_{2}+4.32\:H_{2}O$ The amount of glucose ... $1,00,000$ $L$ is __________ $kg$ (rounded off to the nearest integer).
Yeast biomass $\left ( C_{6}H_{10}O_{3}N \right )$ grown on glucose is described by the stoichiometric equation given below:$$C_{6}H_{12}O_{6}+0.48\:NH_{3}+3\:O_{2} \to 0...
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255
GATE2019: 52
Phenolic wastewater discharged from an industry was treated with Pseudomonas $sp$. in an aerobic bioreactor. The influent and effluent concentrations of phenol were $10,000$ and $10\:ppm$ ... 'chemostat' mode, the working volume require for this process is _____________ $L$ (rounded off to the nearest integer).
Phenolic wastewater discharged from an industry was treated with Pseudomonas $sp$. in an aerobic bioreactor. The influent and effluent concentrations of phenol were $10,0...
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256
GATE2019: 53
In a cross-flow filtration process, the pressure drop $\left ( \Delta P \right )$ driving the fluid flow is $2$ atm, inlet feed pressure $\left ( P_{i} \right )$ is $3$ atm and filtrate pressure $\left ( P_{f} \right )$ is equal to atmospheric pressure. The average transmembrane pressure drop $\left ( \Delta P_{m} \right )$ is ___________ atm.
In a cross-flow filtration process, the pressure drop $\left ( \Delta P \right )$ driving the fluid flow is $2$ atm, inlet feed pressure $\left ( P_{i} \right )$ is $3$ a...
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257
GATE2019: 54
An industrial fermentor containing $10,000\:L$ of medium needs to be sterilized. The initial spore concentration in the medium is $10^{6}$ spores $mL^{-1}$. The desired probability of contamination after sterilization is $10^{-3}$. The ... cell death during heating and cooling phases. The holding time of the sterilization process is___________ min (rounded off to the nearest integer).
An industrial fermentor containing $10,000\:L$ of medium needs to be sterilized. The initial spore concentration in the medium is $10^{6}$ spores $mL^{-1}$. The desired ...
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258
GATE2019: 55
The dimensions and operating condition of a lab-scale fermentor are as follows: Volume = $1\:L$ Diameter = $20$ cm Agitator speed = $600$ rpm Ratio of impeller diameter to fermentor diameter = $0.3$ ... the agitator in the larger reactor is ___________ rpm. Assume that the scale-up factor is the cube root of the ratio of fermentor volumes.
The dimensions and operating condition of a lab-scale fermentor are as follows:Volume = $1\:L$Diameter = $20$ cmAgitator speed = $600$ rpmRatio of impeller diameter to fe...
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GATE2020: 21
The number of molecules of a nucleotide of molecular weight $300\:g$/mol present in $10$ picomoles is ____________ $\times10^{12}$ (round off to $2$ decimal places).
The number of molecules of a nucleotide of molecular weight $300\:g$/mol present in $10$ picomoles is ____________ $\times10^{12}$ (round off to $2$ decimal places).
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260
GATE2020: 22
To facilitate mass transfer from a gas to a liquid phase, a gas bubble of radius $r$ is introduced into the liquid. The gas bubble then breaks into $8$ bubbles of equal radius. Upon this change, the ratio of the interfacial surface area to the gas phase volume for the system changes from $3/r$ to $3n/r$. The value of $n$ is _____________________.
To facilitate mass transfer from a gas to a liquid phase, a gas bubble of radius $r$ is introduced into the liquid. The gas bubble then breaks into $8$ bubbles of equal r...
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261
GATE2020: 25
A variable $Y$ is a function of $t$. Given that $Y\left ( t=0 \right )=1$ and $Y\left ( t=1 \right )=2,\dfrac{dY}{dt}$ in the interval $t=\left [ 0,1 \right ]$ can be approximated as _________________.
A variable $Y$ is a function of $t$. Given that $Y\left ( t=0 \right )=1$ and $Y\left ( t=1 \right )=2,\dfrac{dY}{dt}$ in the interval $t=\left [ 0,1 \right ]$ can be ap...
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numerical-answers
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262
GATE2020: 26
A block of ice at $0 \:^{\circ}C$ is supplied heat at a constant rate to convert ice to superheated steam. Which one of the following trajectories correctly represents the trend of the temperature of the system with time? Assume that the Specific heat of $H_{2}O$ is not a function of temperature.
A block of ice at $0 \:^{\circ}C$ is supplied heat at a constant rate to convert ice to superheated steam. Which one of the following trajectories correctly represents th...
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263
GATE2020: 27
The $DNA$ sequence shown below is to be amplified by $PCR$: $5{}'$ GCTAAGATCTGAATTTTCC$\dots\dots$TTGGGCAATAATGTAGCGC$3{}'$ $3{}'$ CGATTCTAGACTTAAAAGG$\dots\dots$AACCCGTTATTACATCGCG$3{}'$ Which one of the following pair of primers can be ... $3{}'$ $5{}'$ GCTAAGATCTGAATTTTC$3{}'$ and $5{}'$ TGGGCAATAATGTAGCGC$3{}'$
The $DNA$ sequence shown below is to be amplified by $PCR$:$5{}'$ GCTAAGATCTGAATTTTCC$\dots\dots$TTGGGCAATAATGTAGCGC$3{}'$$3{}'$ CGATTCTAGACTTAAAAGG$\dots\dots$AACCCGTTAT...
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264
GATE2020: 28
Which of the following statements about immune response are $CORRECT$? $T$ cells are activated by antigen-presenting cells Foreign peptides are not presented to helper $T$ cells by Class $II$ $MHC$ proteins Dendritic cells are referred to as professional antigen- presenting cells $P$ and $R$ only $P$ and $Q$ only $Q$ and $R$ only $P, Q$ and $R$
Which of the following statements about immune response are $CORRECT$?$T$ cells are activated by antigen-presenting cellsForeign peptides are not presented to helper $T$ ...
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265
GATE2020: 29
Which of the following statemets are $CORRECT$ about eukaryotic cell cycle? $CDKs$ can phosphorylate proteins in the absence of cyclins $CDKs$ can be inactivated by phosphorylation Degradation of cyclins is required for cell cycle progression $CDKs$ are not involved in chromosome condensation $P$ and $R$ only $P$ and $S$ only $P, Q$ and $R$ only $Q$ and $R$ only
Which of the following statemets are $CORRECT$ about eukaryotic cell cycle?$CDKs$ can phosphorylate proteins in the absence of cyclins$CDKs$ can be inactivated by phospho...
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266
GATE2020: 30
$W,X$ and $Y$ are the intermediates in a biochemical pathway as shown below: $S \cdots \cdots \rightarrow W\rightarrow X\rightarrow Y\rightarrow Z$ Mutants auxotrophic for $Z$ are found in four different complementation groups, namely $Z1$, $Z2$, $Z3$ ... $S \cdots \cdots \overset{Z4}{\rightarrow}W\overset{Z1}{\rightarrow}X\overset{Z2}{\rightarrow} Y\overset{Z3}{\rightarrow}Z$
$W,X$ and $Y$ are the intermediates in a biochemical pathway as shown below:$$S \cdots \cdots \rightarrow W\rightarrow X\rightarrow Y\rightarrow Z$$Mutants auxotrophic fo...
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GATE2020: 31
In tomato plant, red ($R$) is dominant over yellow ($r$) for fruit color and purple ($P$) is dominant over green ($p$) for stem color. Fruit color and stem color assort independently. The number of progeny plants of different fruit/stem colors obtained from a ... genotypes of the parent plants in this mating? $RrPp \times Rrpp$ $RrPp \times RrPp$ $RRPP \times rrpp$ $RrPP \times Rrpp$
In tomato plant, red ($R$) is dominant over yellow ($r$) for fruit color and purple ($P$) is dominant over green ($p$) for stem color. Fruit color and stem color assort i...
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GATE2020: 32
Some of the cytokinins used in plant tissue culture media are given below: $BAP$ Zeatin Kinetin $2iP$ Which of these are synthetic analogs? $P$ and $Q$ only $Q$ and $S$ only $R$ and $S$ only $P$ and $R$ only
Some of the cytokinins used in plant tissue culture media are given below:$BAP$ZeatinKinetin$2iP$Which of these are synthetic analogs?$P$ and $Q$ only$Q$ and $S$ only$R$ ...
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269
GATE2020: 33
Carl Woese used the gene sequence of which one of the following for phylogenetic taxonomy of prokaryotes? A ribosomal $RNA$ of large ribosomal subunit A ribosomal $RNA$ of small ribosomal subunit A ribosomal protein of large ribosomal subunit A ribosomal protein of small ribosomal subunit
Carl Woese used the gene sequence of which one of the following for phylogenetic taxonomy of prokaryotes?A ribosomal $RNA$ of large ribosomal subunitA ribosomal $RNA$ of...
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270
GATE2020: 34
A list of pathogens $(Group\; I)$ and a list of anti-microbial agents $(Group\; II)$ ... $P-5, Q-2, R-4, S-1$ $P-2, Q-3, R-4, S-1$ $P-2, Q-3, R-1, S-5$
A list of pathogens $(Group\; I)$ and a list of anti-microbial agents $(Group\; II)$ used to treat their infections are given below. Match the pathogens with the correspo...
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271
GATE2020: 35
Determine the correctness or otherwise of the following Assertion [$a$] and the Reason [$r$]. Assertion [$a$]: Dam methylase protects $E$. coli $DNA$ from phage endonucleases Reason [$r$]: $E$. coli Dam methylase methylates the adenosine residue in the sequence "$GATC$" Both [ ... not the correct reason for [$a$] Both [$a$] and [$r$] are false [$a$] is false but [$r$] is true
Determine the correctness or otherwise of the following Assertion [$a$] and the Reason [$r$].Assertion [$a$]: Dam methylase protects $E$. coli $DNA$ from phage endonuclea...
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272
GATE2020: 36
Determine the correctness or otherwise of the following Assertion [$a$] and the Reason [$r$]. Assertion [$a$]: Embryonic stem cells are suitable for developing knockout mice Reason [$r$]: Homologous recombination is more frequent in embryonic stem cells than that in somatic cells Both [$a$] ... ] are true, but [$r$] is not the correct reason for [$a$] [$a$] is true. but [$r$] is false
Determine the correctness or otherwise of the following Assertion [$a$] and the Reason [$r$].Assertion [$a$]: Embryonic stem cells are suitable for developing knockout mi...
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GATE2020: 37
The schematic of a plasmid with a gap in one of the strands is shown below: Which of the following enzyme(s) is/are required to fill the gap and generate a covalently closed circular plasmid? $DNA$ ligase AIkaline phosphatase $DNA$ polymerase Polynucleotide kinase $P$ only $P, R$ and $S$ only $P$ and $R$ only $P, Q$ and $R$ only
The schematic of a plasmid with a gap in one of the strands is shown below:Which of the following enzyme(s) is/are required to fill the gap and generate a covalently clos...
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274
GATE2020: 38
Match sub-cellular organelles listed in $Group\; I$ with their features listed in $Group\; II$ ... $P-2, Q-3, R-4, S-1$ $P-3, Q-4, R-2, S-1$ $P-3, Q-1, R-4, S-2$
Match sub-cellular organelles listed in $Group\; I$ with their features listed in $Group\; II$:$$\begin{array}{|cl|cI|cI|cI|cI|c|}\hline&\textbf{Group I} & \textbf{Group ...
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275
GATE2020: 39
Which of the following strategies are used by cells for metabolic regulation? Phosphorylation-dephosphorylation Allostery Feedback inhibition $P$ and $Q$ only $P$ and $R$ only $Q$ and $R$ only $P, Q$ and $R$
Which of the following strategies are used by cells for metabolic regulation?Phosphorylation-dephosphorylationAllosteryFeedback inhibition$P$ and $Q$ only$P$ and $R$ only...
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276
GATE2020: 40
Determine the correctness or otherwise of the following Assertion [$a$] and the Reason [$r$]. Assertion [$a$]: A zygote and its immediate descendant cells are unspecialized and are called totipotent Reason [$r$]: Totipotent cells retain the capacity to differentiate into only a few cell types ... $r$] are true and [$r$] is the correct reason for [$a$] [$a$] is true but [$r$] is false
Determine the correctness or otherwise of the following Assertion [$a$] and the Reason [$r$].Assertion [$a$]: A zygote and its immediate descendant cells are unspecialize...
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277
GATE2020: 41
Which of the following statements about gene therapy are CORRECT? Affected individuals, but not their progeny, can be cured through germline gene therapy Affected individuals, as well as their progeny, can be cured through germline gene therapy Affected individuals, but not their progeny, can be cured ... therapy $P$ and $R$ only $P$ and $S$ only $Q$ and $R$ only $Q$ and $S$ only
Which of the following statements about gene therapy are CORRECT?Affected individuals, but not their progeny, can be cured through germline gene therapyAffected individua...
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278
GATE2020: 42
Determine the correctness or otherwise of the following Assertion [$a$] and the Reason [$r$]. Assertion [$a$]: A genetically engineered rice that produces beta-carotene in the rice grain is called Golden rice Reason [$r$ ... [$r$] are true and [$r$] is the correct reason for [$a$] [$a$] is true but [$r$] is false
Determine the correctness or otherwise of the following Assertion [$a$] and the Reason [$r$].Assertion [$a$]: A genetically engineered rice that produces beta-carotene in...
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279
GATE2020: 43
The sequence of a $1$ $Mb$ long $DNA$ is random. This $DNA$ has all four bases occurring in equal proportion. The number of nucleotides, on average, between two successive $EcoRI$ recognition site $GAATTC$ is ____________.
The sequence of a $1$ $Mb$ long $DNA$ is random. This $DNA$ has all four bases occurring in equal proportion. The number of nucleotides, on average, between two successiv...
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GATE2020: 44
$E$ coli was grown in $^{15}N$ medium for several generations. Cells were then transferred to $^{14}N$ medium, allowed to grow for $4$ generations and $DNA$ was isolated immediately. The proportion of total $DNA$ with intermediate density is ___________ (round off to $2$ decimal places).
$E$ coli was grown in $^{15}N$ medium for several generations. Cells were then transferred to $^{14}N$ medium, allowed to grow for $4$ generations and $DNA$ was isolated ...
soujanyareddy13
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soujanyareddy13
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