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81
GATE2018-46
A microbial strain is cultured in a $100$ L stirred fermenter for secondary metabolite production. If the specific rate of oxygen uptake is $0.4 \: h^{-1}$ and the oxygen solubility in the broth is $8 $ ... $s^{-1}$) of oxygen required to achieve a maximum cell concentration of $12$ g/L is (up to two decimal places) ___________
A microbial strain is cultured in a $100$ L stirred fermenter for secondary metabolite production. If the specific rate of oxygen uptake is $0.4 \: h^{-1}$ and the oxygen...
gatecse
1.4k
points
gatecse
asked
Feb 20, 2018
Bioprocess Engineering and Process Biotechnology
gate2018
bioprocess
fermenter
numerical-answers
+
–
0
votes
0
answers
82
GATE BT 2023 | Question: 46
If $1000 \mathrm{bp}$ of a double-helical DNA weighs $1 \times 10^{-18} \mathrm{gm}$ and distance between two $\mathrm{bp}$ is $0.34 \mathrm{~nm}$, the total amount of DNA (in mg, rounded off to one decimal place) required to stretch from Earth to Moon (assuming the distance between Earth and Moon to be $3,74,000 \mathrm{~km}$ ) is ______________.
If $1000 \mathrm{bp}$ of a double-helical DNA weighs $1 \times 10^{-18} \mathrm{gm}$ and distance between two $\mathrm{bp}$ is $0.34 \mathrm{~nm}$, the total amount of DN...
admin
2.7k
points
admin
asked
May 21, 2023
Others
gatebt-2023
+
–
0
votes
0
answers
83
GATE BT 2023 | Question: 51
Ten playing cards numbered $1,2,3, \ldots, 10$ are placed face down on a table. One card is drawn at random, its number recorded, and then replaced face down. A card is drawn again at random. The probability that the number on the second draw is greater than the number on the first draw (rounded off to two decimal places) is ___________.
Ten playing cards numbered $1,2,3, \ldots, 10$ are placed face down on a table. One card is drawn at random, its number recorded, and then replaced face down. A card is d...
admin
2.7k
points
admin
asked
May 21, 2023
Others
gatebt-2023
+
–
0
votes
0
answers
84
GATE2018-3
The repeat sequence of telomere in humans is $5'-\text{TATAAT}-3’$ $5'-\text{TTAGGG}-3'$ $5’-\text{GGGCCC}-3'$ $5’-\text{AAAAAA }-3'$
The repeat sequence of telomere in humans is$5'-\text{TATAAT}-3’$$5'-\text{TTAGGG}-3'$$5’-\text{GGGCCC}-3'$$5’-\text{AAAAAA }-3'$
gatecse
1.4k
points
gatecse
asked
Feb 20, 2018
General Biology
gate2018
molecular
biology
genetics
+
–
–1
votes
2
answers
85
GATE BT 2023 | GA Question: 1
"You are delaying the completion of the task. Send ____________ contributions at the earliest." you are your you're yore
"You are delaying the completion of the task. Send ____________ contributions at the earliest."you areyouryou'reyore
admin
2.7k
points
admin
asked
May 21, 2023
Others
gatebt-2023
+
–
0
votes
0
answers
86
GATE2016-14
Which one of the following statements is NOT true? In competitive inhibition, substrate and inhibitor compete for the same active site of an enzyme Addition of a large amount of substrate to an enzyme cannot overcome uncompetitive inhibition A transition ... non-competitive inhibition, $K_m$ of an enzyme for its substrate remains constant as the concentration of the inhibitor increases
Which one of the following statements is NOT true?In competitive inhibition, substrate and inhibitor compete for the same active site of an enzymeAddition of a large amou...
Milicevic3306
7.9k
points
Milicevic3306
asked
Mar 26, 2018
Others
gate2016
+
–
0
votes
0
answers
87
GATE2018-48
Mammalian cells in active growth phase were seeded at a density of $1 \times 10^5$ cells/ml. After $72$ hours, $1 \times 10^6$ cells/ml were obtained. The population doubling time of the cells in hours is (up to two decimal places) ________________
Mammalian cells in active growth phase were seeded at a density of $1 \times 10^5$ cells/ml. After $72$ hours, $1 \times 10^6$ cells/ml were obtained. The population doub...
gatecse
1.4k
points
gatecse
asked
Feb 20, 2018
Microbiology
gate2018
microbiology
microbial
growth
numerical-answers
+
–
0
votes
0
answers
88
GATE2014-12
The degree of reduction of ethanol is_______
The degree of reduction of ethanol is_______
Milicevic3306
7.9k
points
Milicevic3306
asked
Mar 25, 2018
Bioprocess Engineering and Process Biotechnology
gate2014
degree-of-reduction-of-elements
numerical-answers
+
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0
votes
1
answer
89
GATE2018-37
An analysis of DNA-protein interactions was carried out using all DNA-protein complexes in the protein data bank (PDB). The frequency distribution of four amino acid residues, represented as P, Q, R and S, occurring in non-covalent interactions between the protein and DNA backbone is shown below. Which ... Gln, Q-Glu, R-Lys, S-Arg P-Asn, Q-Asp, R-Arg, S-Lys P-His, Q-Glu, R-Gln, S-Lys
An analysis of DNA-protein interactions was carried out using all DNA-protein complexes in the protein data bank (PDB). The frequency distribution of four amino acid resi...
gatecse
1.4k
points
gatecse
asked
Feb 20, 2018
Bioinformatics
gate2018
bioinformatics
molecular
biology
+
–
–1
votes
0
answers
90
GATE BT 2023 | Question: 44
An enzyme (E) catalyzes the biochemical reaction $A \rightarrow B$ with $k_{c a t}$ equal to $500 s^{-1}$. If the initial reaction velocity $\left(V_{0}\right)$ is $10 \mu M . s^{-1}$ at the total enzyme concentration $\left[E_{t}\right]$ of $30 n M$ and substrate concentration $[\mathrm{A}]$ of $40 \mu M$, the value of $K_{m}($ in $\mu M)$ is ______________.
An enzyme (E) catalyzes the biochemical reaction $A \rightarrow B$ with $k_{c a t}$ equal to $500 s^{-1}$. If the initial reaction velocity $\left(V_{0}\right)$ is $10 \m...
admin
2.7k
points
admin
asked
May 21, 2023
Others
gatebt-2023
+
–
–1
votes
0
answers
91
GATE2018-24
A single stem cell undergoes $10$ asymmetric cell divisions. The number of stem cells at the end is _________
A single stem cell undergoes $10$ asymmetric cell divisions. The number of stem cells at the end is _________
gatecse
1.4k
points
gatecse
asked
Feb 20, 2018
Plant, Animal and Microbial Biotechnology
gate2018
animal
biotechnology
numerical-answers
+
–
0
votes
0
answers
92
GATE BT 2023 | Question: 38
E. coli is cultivated in a chemostat operated at a dilution rate of $0.2 h^{-1}$. The values of biomass yield due to oxygen consumption and the steady state biomass concentration are $0.2 g \cdot g^{-1}$ and $10 g \cdot L^{-1}$, respectively. The oxygen transfer rate (in $g \cdot L^{-1} \cdot h^{-1}$) is ______________.
E. coli is cultivated in a chemostat operated at a dilution rate of $0.2 h^{-1}$. The values of biomass yield due to oxygen consumption and the steady state biomass conce...
admin
2.7k
points
admin
asked
May 21, 2023
Others
gatebt-2023
+
–
0
votes
0
answers
93
GATE2016-47
$\textit{Saccharomyces cerevisiae}$ is cultured in a chemostat (continuous fermentation) at a dilution rate of $0.5 \: h^{-1}$. The feed substrate concentration is $10 \: g \cdot L^{-1}$. The biomass concentration in the chemostat at steady state will be _________ $g \cdot L^{-1}$. ... $K_s = 0.3 \: g \cdot L^{-1}$ and $s$ is substrate concentration $(g \cdot L^{-1})$.
$\textit{Saccharomyces cerevisiae}$ is cultured in a chemostat (continuous fermentation) at a dilution rate of $0.5 \: h^{-1}$. The feed substrate concentration is $10 \:...
Milicevic3306
7.9k
points
Milicevic3306
asked
Mar 26, 2018
Others
gate2016
numerical-answers
+
–
0
votes
1
answer
94
GATE BT 2023 | Question: 18
Which one of the following methods CANNOT be used to determine the secondary structure content of a protein? Circular dichroism spectroscopy Fourier transform infrared spectroscopy Mass spectrometry X-ray crystallography
Which one of the following methods CANNOT be used to determine the secondary structure content of a protein?Circular dichroism spectroscopyFourier transform infrared spec...
admin
2.7k
points
admin
asked
May 21, 2023
Others
gatebt-2023
+
–
0
votes
0
answers
95
GATE BT 2023 | Question: 53
An evaporator is insulated using glass wool material of $0.15 \mathrm{~m}$ thickness. The inner most surface and the outer surface of the insulation are at $700{ }^{\circ} \mathrm{C}$ and $80^{\circ} \mathrm{C}$, respectively. The mean thermal ... in $W$ ) through $1.2 \mathrm{~m}^2$ of the evaporator wall surface (rounded off to the nearest integer) is ______________.
An evaporator is insulated using glass wool material of $0.15 \mathrm{~m}$ thickness. The inner most surface and the outer surface of the insulation are at $700{ }^{\circ...
admin
2.7k
points
admin
asked
May 21, 2023
Others
gatebt-2023
+
–
0
votes
0
answers
96
GATE2016-GA-6
Students taking an exam are divided into two groups: $P$ and $Q$ such that each group has the same number of students. The performance of each of the students in a test was evaluated out of $200$ marks. It was observed that the mean of group $P$ was $105$, while ... of group $Q$ scored marks in a narrower range than students in group $P$. The median of the marks of group $P$ is $100$.
Students taking an exam are divided into two groups: $P$ and $Q$ such that each group has the same number of students. The performance of each of the students in a test w...
Milicevic3306
7.9k
points
Milicevic3306
asked
Mar 26, 2018
Quantitative Aptitude
gate2016
numerical-ability
statistics
mean-and-standard-deviation
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–
0
votes
0
answers
97
GATE2018-14
Cell type A secretes molecule X into the culture medium. Cell type B in the same culture responds to the molecule X by expressing protein Y. Which one of the following modes of signaling represents the interaction between A and B? Autocrine Juxtacrine Paracrine Intracrine
Cell type A secretes molecule X into the culture medium. Cell type B in the same culture responds to the molecule X by expressing protein Y. Which one of the following mo...
gatecse
1.4k
points
gatecse
asked
Feb 20, 2018
Cell Biology
gate2018
cell
biology
+
–
0
votes
0
answers
98
GATE2018-8
A mixture contains three similarly sized peptides P, Q and R. The peptide P is positively charged, Q is weakly negative and R is strongly negative. If this mixture is passed through an ion-exchange chromatography column containing an anionic resin, their order of elution will be P, Q, R R, Q, P Q, R, P P, Q and R elute together
A mixture contains three similarly sized peptides P, Q and R. The peptide P is positively charged, Q is weakly negative and R is strongly negative. If this mixture is pas...
gatecse
1.4k
points
gatecse
asked
Feb 20, 2018
Analytical Techniques
gate2018
analytical techniques
chromatography
+
–
0
votes
0
answers
99
GATE2018-9
Which one of the following is INCORRECT about protein structures? A protein fold is stabilized by favorable non-covalent interactions All parts of a fold can be classified as helices, strands or turns Two non-covalent atoms cannot be closer than the sum of their van der Waals radii The peptide bond is nearly planar
Which one of the following is INCORRECT about protein structures?A protein fold is stabilized by favorable non-covalent interactionsAll parts of a fold can be classified ...
gatecse
1.4k
points
gatecse
asked
Feb 20, 2018
Molecular Biology and Genetics:
gate2018
molecular
biology
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–
0
votes
0
answers
100
GATE BT 2023 | Question: 7
Dendritic cells are involved in cross-presentation of antigens. Which of the following protein(s) is(are) required for cross-presentation? P. Basic leucine zipper ATF-like transcription factor $3$ (BATF3) Q. Membrane associated ring-CH-type finger $1$ (MARCH-1) R. Solute carrier ... $\mathrm{R}$ only $\mathrm{P}, \mathrm{Q}$ and $\mathrm{R}$ only $\text{S}$ only
Dendritic cells are involved in cross-presentation of antigens. Which of the following protein(s) is(are) required for cross-presentation?P. Basic leucine zipper ATF-like...
admin
2.7k
points
admin
asked
May 21, 2023
Others
gatebt-2023
+
–
0
votes
0
answers
101
GATE BT 2021 | Question: 48
In a random mating population, $Y$ and $y$ are dominant and recessive alleles, respectively. If the frequency of $Y$ allele in both sperm and egg is $0.70$, then the frequency $Y/y$ heterozygotes (rounded off to two decimal places) is ___________.
In a random mating population, $Y$ and $y$ are dominant and recessive alleles, respectively. If the frequency of $Y$ allele in both sperm and egg is $0.70$, then the freq...
go_editor
1.4k
points
go_editor
asked
Mar 1, 2021
Others
gatebt-2021
numerical-answers
+
–
0
votes
0
answers
102
GATE BT 2022 | Question: 48
The amount of biomass in a reactor at the end of the batch process is $50 \; \text{g}.$ Fed-batch operation is initiated by feeding the substrate solution at a constant rate of $1 \; \text{L h}^{-1}.$ The concentration of substrate in the feed is ... system is at quasi-steady state, the maximum amount of biomass after $5 \; \text{h}$ of feeding is __________ $\text{g}.$
The amount of biomass in a reactor at the end of the batch process is $50 \; \text{g}.$ Fed-batch operation is initiated by feeding the substrate solution at a constant r...
Lakshman Bhaiya
1.4k
points
Lakshman Bhaiya
asked
Mar 20, 2022
Others
gatebt-2022
numerical-answers
+
–
0
votes
1
answer
103
GATE2018-38
A pedigree of an inheritable disease is shown below. What type of inheritance does the disease follow? Autosomal dominant X-linked dominant X-linked recessive Autosomal recessive
A pedigree of an inheritable disease is shown below.What type of inheritance does the disease follow?Autosomal dominantX-linked dominantX-linked recessiveAutosomal recess...
gatecse
1.4k
points
gatecse
asked
Feb 20, 2018
Immunology
gate2018
immunology
+
–
0
votes
0
answers
104
GATE2016-46
The empirical formula for biomass of an unknown organism is $CH_{1.8}O_{0.5}N_{0.2}$. To grow this organism, ethanol $(C_2H_5OH)$ and ammonia are used as carbon and nitrogen sources, respectively. Assume no product formation other than biomass. To produce $1$ mole of biomass from $1$ mole of ethanol, the number of moles of oxygen required will be __________
The empirical formula for biomass of an unknown organism is $CH_{1.8}O_{0.5}N_{0.2}$. To grow this organism, ethanol $(C_2H_5OH)$ and ammonia are used as carbon and nitro...
Milicevic3306
7.9k
points
Milicevic3306
asked
Mar 26, 2018
Others
gate2016
numerical-answers
+
–
0
votes
0
answers
105
GATE BT 2023 | Question: 54
A proportional controller is used to control the temperature of an autoclave from $60^{\circ} \mathrm{C}$ to $130^{\circ} \mathrm{C}$. If the proportional band setting of the controller is $25 \%$, the proportional gain value is ___________.
A proportional controller is used to control the temperature of an autoclave from $60^{\circ} \mathrm{C}$ to $130^{\circ} \mathrm{C}$. If the proportional band setting of...
admin
2.7k
points
admin
asked
May 21, 2023
Others
gatebt-2023
+
–
–1
votes
0
answers
106
GATE BT 2022 | Question: 25
For a pure species, the slope of the melting line $\frac{dP}{dT} \; \text{at} \; -2 \; ^{\circ} \textrm{C} \; \text{is} -5.0665 \times 10^{6} \text{Pa K}^{-1}.$ ... $\text{J} \; \text{mol}^{-1}.$
For a pure species, the slope of the melting line$$\frac{dP}{dT} \; \text{at} \; -2 \; ^{\circ} \textrm{C} \; \text{is} -5.0665 \times 10^{6} \text{Pa K}^{-1}.$$The diff...
Lakshman Bhaiya
1.4k
points
Lakshman Bhaiya
asked
Mar 20, 2022
Others
gatebt-2022
numerical-answers
+
–
0
votes
0
answers
107
GATE2012-30
A single base pair of DNA weighs $1.1 \times 10^{-21}$ grams. How many picomoles of a plasmid vector of length $2750$ bp are contained in 1 $\mu$g of purified DNA? $0.30$ $0.55$ $0.25$ $0.91$
A single base pair of DNA weighs $1.1 \times 10^{-21}$ grams. How many picomoles of a plasmid vector of length $2750$ bp are contained in 1 $\mu$g of purified DNA?$0.30$$...
Milicevic3306
7.9k
points
Milicevic3306
asked
Mar 25, 2018
Others
gate2012
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–
0
votes
0
answers
108
GATE2018-17
Which one of the following techniques is used to monitor RNA transcripts, both temporally and spatially? Northern blotting In situ hybridization Southern blotting Western blotting
Which one of the following techniques is used to monitor RNA transcripts, both temporally and spatially?Northern blottingIn situ hybridizationSouthern blottingWestern blo...
gatecse
1.4k
points
gatecse
asked
Feb 20, 2018
Recombinant DNA technology and Other Tools in Biotechnology
gate2018
recombinant
dna
technology
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–
0
votes
0
answers
109
GATE BT 2023 | GA Question: 6
Human beings are one among many creatures that inhabit an imagined world. In this imagined world, some creatures are cruel. If in this imagined world, it is given that the statement "Some human beings are not cruel creatures" is FALSE, then which of the following set of statement( ... $\text{(i)}$ and $\text{(ii)}$ $\text{(i), (ii)}$ and $\text{(iii)}$
Human beings are one among many creatures that inhabit an imagined world. In this imagined world, some creatures are cruel. If in this imagined world, it is given that th...
admin
2.7k
points
admin
asked
May 21, 2023
Others
gatebt-2023
+
–
0
votes
0
answers
110
GATE2016-43
The molar extinction coeffcients of Trp and Tyr at $280$ nm are $5690$ and $1280 \: M^{-1} \cdot cm^{-1}$, respectively. The polypeptide chain of yeast alcohol dehydrogenase ($37$ kDa) contains $5$ Trp and $14$ Tyr residues. ... pathlength will be _________ (Assume that the molar extinction coefficient values for Trp and Tyr apply to these amino acids inthe yeast alcohol dehydrogenase).
The molar extinction coeffcients of Trp and Tyr at $280$ nm are $5690$ and $1280 \: M^{-1} \cdot cm^{-1}$, respectively. The polypeptide chain of yeast alcohol dehydrogen...
Milicevic3306
7.9k
points
Milicevic3306
asked
Mar 26, 2018
Others
gate2016
+
–
0
votes
0
answers
111
GATE2014-10
Which of the following is employed for the repeated use of enzymes in bioprocesses? polymerization immobilization ligation isomerization
Which of the following is employed for the repeated use of enzymes in bioprocesses?polymerizationimmobilizationligationisomerization
Milicevic3306
7.9k
points
Milicevic3306
asked
Mar 25, 2018
Bioprocess Engineering and Process Biotechnology
gate2014
enzymes
+
–
0
votes
0
answers
112
GATE BT 2023 | Question: 13
In hybridoma technology, which one of the following enzymes is absent in the myeloma cells that are used for monoclonal antibody production? Hypoxanthine-guanine phosphoribosyltransferase Alanine aminotransferase Triose phosphate isomerase Glycosyltransferase
In hybridoma technology, which one of the following enzymes is absent in the myeloma cells that are used for monoclonal antibody production?Hypoxanthine-guanine phosphori...
admin
2.7k
points
admin
asked
May 21, 2023
Others
gatebt-2023
+
–
0
votes
0
answers
113
GATE2016-45
Analysis of a hexapeptide using enzymatic cleavage reveals the following result: Amino acid composition of the peptide is: $2R, A, V, S, Y$ Trypsin digestion yields two fragments and the compositions are: $(R A,V)$ and $(R, S, Y)$ Chymotrypsin digestion yields ... peptide. The correct amino acid sequence of the peptide is $\text{RSYRVA}$ $\text{AVRYSR}$ $\text{SRYVAR}$ $\text{SVRRYA}$
Analysis of a hexapeptide using enzymatic cleavage reveals the following result:Amino acid composition of the peptide is: $2R, A, V, S, Y$Trypsin digestion yields two fra...
Milicevic3306
7.9k
points
Milicevic3306
asked
Mar 26, 2018
Others
gate2016
+
–
0
votes
0
answers
114
GATE BT 2021 | Question: 51
A batch cultivation of $\textit{E. coli}$ follows zeroth order Monod's growth kinetics. The cell growth is terminated when the residual dissolved oxygen concentration attains $10\%$ of its saturation value and oxygen mass transfer coefficient $(k_La)$ reaches its ... (rounded off to two decimal places) at the end of the batch cultivation is __________
A batch cultivation of $\textit{E. coli}$ follows zeroth order Monod’s growth kinetics. The cell growth is terminated when the residual dissolved oxygen concentration a...
go_editor
1.4k
points
go_editor
asked
Mar 1, 2021
Others
gatebt-2021
numerical-answers
+
–
0
votes
0
answers
115
GATE2018-GA-2
In spite of being warned repeatedly, he failed to correct his _________ behaviour." The word that best fills the blank in the above sentence is rational reasonable errant good
In spite of being warned repeatedly, he failed to correct his _________ behaviour."The word that best fills the blank in the above sentence isrationalreasonableerrantgood...
gatecse
1.4k
points
gatecse
asked
Feb 20, 2018
Verbal Aptitude
gate2018
verbal-ability
most-appropriate-word
+
–
0
votes
0
answers
116
GATE2020: 16
A microorganism isolated from a salt-rich (salt concentration $\sim2$ $M$) lake was found to possess diglycerol tetraethers, with polyisoprenoid alcohol side chains, as the major lipid component of its cell membrane. The isolated organism is a planctomycete a cyanobacteria a unicellular amoeba an archaea
A microorganism isolated from a salt-rich (salt concentration $\sim2$ $M$) lake was found to possess diglycerol tetraethers, with polyisoprenoid alcohol side chains, as t...
soujanyareddy13
2.7k
points
soujanyareddy13
asked
Nov 3, 2020
Others
gate2020
+
–
0
votes
0
answers
117
GATE2015-56
Assuming random distribution of nucleotides, the average number of fragments generated upon digestion of a circular DNA of size $4.3 \times 10^5$ bp with $\textit{Alu}I (5 ' – AG \downarrow CT-3' )$ is _________$ \times 10^3$
Assuming random distribution of nucleotides, the average number of fragments generated upon digestion of a circular DNA of size $4.3 \times 10^5$ bp with $\textit{Alu}I (...
Milicevic3306
7.9k
points
Milicevic3306
asked
Mar 26, 2018
Others
gate2015
numerical-answers
+
–
–1
votes
0
answers
118
GATE BT 2023 | Question: 43
The following schematic diagram shows a chemostat with cell recycle where $\mathrm{F}_0$ and $\mathrm{F}_{\mathrm{r}}$ are the volumetric flow rates (in $L \cdot h^{-1}$ ) of feed and recycle streams, respectively. $\mathrm{X}_1, \mathrm{X}_0$ ... $\mathrm{X}$ (in $g \cdot L^{-1}$, rounded off to one decimal place) is ________________.
The following schematic diagram shows a chemostat with cell recyclewhere $\mathrm{F}_0$ and $\mathrm{F}_{\mathrm{r}}$ are the volumetric flow rates (in $L \cdot h^{-1}$ )...
admin
2.7k
points
admin
asked
May 21, 2023
Others
gatebt-2023
+
–
0
votes
0
answers
119
GATE2016-22
Runs scored by a batsman in five one-day matches are $55$, $75$, $67$, $88$ and $15$. The standard deviation is _________
Runs scored by a batsman in five one-day matches are $55$, $75$, $67$, $88$ and $15$. The standard deviation is _________
Milicevic3306
7.9k
points
Milicevic3306
asked
Mar 26, 2018
Probability and Statistics
gate2016
numerical-answers
probability-and-statistics
statistics
standard-deviation
+
–
0
votes
0
answers
120
GATE BT 2021 | Question: 25
The enzyme $\alpha$-amylase used in starch hydrolysis has an affinity constant $(K_m)$ value of $0.005 \: M$. To achieve one-fourth of the maximum rate of hydrolysis, the required starch concentration $mM$ (rounded off to two decimal places) is ____________
The enzyme $\alpha$-amylase used in starch hydrolysis has an affinity constant $(K_m)$ value of $0.005 \: M$. To achieve one-fourth of the maximum rate of hydrolysis, the...
go_editor
1.4k
points
go_editor
asked
Mar 1, 2021
Others
gatebt-2021
numerical-answers
+
–
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