Life Sciences
GATE XL exam:gate PYQs
Build your understanding with focused practice from past exam papers.
Questions 531–540 of 1235. Imported answers require independent review unless marked reviewed.
Question 43
Open questionXL-QNAT2 marksNeeds review
The standard free energy changes for conversion of phosphoenol pyruvate (
) to pyruvate, and
synthesis are shown below.
The starting concentrations of
,
, pyruvate, and
are 25, 25, 50, and 50
, respectively. The value of universal gas constant (
) is 8.315
. The actual free energy change in
for the reaction
carried out at 37 °C will be ____ (rounded off to one place of decimal).
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Open questionXL-QNAT2 marksNeeds review
The dissociation constant for a receptor-ligand pair is
. The ligand was added to a solution of the receptor such that the receptor was 50% saturated at equilibrium. Assume that the receptor has one ligand binding site. The concentration of the free ligand at equilibrium in
, correct to the nearest integer, should be ____.Log in to check the answer
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Open questionXL-QNAT2 marksNeeds review
The half-maximal velocity of an enzyme catalyzed reaction was found at a substrate concentration of
. This enzyme follows Michaelis-Menten kinetics. In the presence of a competitive inhibitor, the half-maximal velocity was found at a substrate concentration of
. Given that the enzyme-inhibitor pair has a dissociation constant of
, the concentration of the competitive inhibitor in
, rounded off to one place of decimal, was____.Log in to check the answer
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Open questionXL-QNAT2 marksNeeds review
A forty-times diluted sample of ssRNA gave an
of 0.01. The concentration of the ssRNA before the dilution in
was ____ (correct to the nearest integer).Log in to check the answer
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Open questionXL-RMCQ1 markNeeds review
In Angiosperms, normally ‘Eaxh Xylem’ occurs in
Your answerChoose one option.
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Open questionXL-RMCQ1 markNeeds review
‘Quiescent Center’ is present in
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Open questionXL-RMCQ1 markNeeds review
With reference to virulence (vir) region of nopaline type Ti plasmid of Agrobacterium tumefaciens, match Group-I (vir gene) and Group-II (coded protein) in CORRECT combination.
Group-I | Group-II
P. vir A | I. Single strand T-DNA binding protein
Q. vir B | II. Topoisomerase
R. vir E | III. Membrane protein, channel for T-DNA
S. vir D | IV. Sensor protein, constitutive expression
Your answerChoose one option.
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Open questionXL-RMCQ1 markNeeds review
Anomalous secondary growth is observed in
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Open questionXL-RMSQ1 markNeeds review
Which of the following plant diseases is/are caused by bacteria?
Your answerSelect all correct options. You can choose more than one.
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Open questionXL-RMSQ1 markNeeds review
Phylogenetic system of classification is/are proposed by
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