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NEET Biology 2021 PYQs
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100 questions in NEET 2021
Match Column - I with Column - II.
Column-I
Column-II
(A)Nitrococcus
(I)Denitrification
(B)Rhizobium
(II)Conversion of ammonia to nitrite
(C)Thiobacillus
(III)Conversion of nitrite to nitrate
(D)Nitrobacter
(IV)Conversion of atmospheric nitrogen to ammonia
Choose the correct answer from the options given below:
A
A-II, B-IV, C-I, D-III,
B
A-I, B-II, C-III, D-IV,
C
A-III, B-I, C-IV, D-II,
D
A-IV, B-III, C-II, D-I,
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Which of the following statements is incorrect?
A
Both ATP and NADPH + H+ are synthesized during non-cyclic photophosphorylation.
B
Stroma lamellae have PS I only and lack NADP
reductase.
C
Grana lamellae have both PS I and PS II.
D
Cyclic photophosphorylation involves both PS I and PS II.
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Which of the following statements is incorrect?
A
During aerobic respiration, role of oxygen is
limited to the terminal stage.
B
In ETC (Electron Transport Chain), one molecule
of NADH + H+ gives rise to 2 ATP molecules, and one FADH2 gives rise to 3 ATP molecules.
C
ATP is synthesized through complex V.
D
Oxidation-reduction reactions produce proton
gradient in respiration.
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In some members of which of the following pairs of
families, pollen grains retain their viability for months after release?
A
Poaceae ; Rosaceae
B
Poaceae; Leguminosae
C
Poaceae; Solanaceae
D
Rosaceae ; Leguminosae
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What is the role of RNA polymerase III in the process of transcription in eukaryotes?
A
Transcribes rRNAs (28S, 18S and 5.8S)
B
Transcribes tRNA, 5s rRNA and snRNA
C
Transcribes precursor of mRNA
D
Transcribes only snRNAs
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DNA fingerprinting involves identifying differences
in some specific regions in DNA sequence, called
as:
A
Satellite DNA
B
Repetitive DNA
C
Single nucleotides
D
Polymorphic DNA
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Identify the correct statement.
A
In capping, methyl guanosine triphosphate is
added to the 3' end of hnRNA.
B
RNA polymerase binds with Rho factor to
terminate the process of transcription in
bacteria.
C
The coding strand in a transcription unit is
copied to an mRNA.
D
Split gene arrangement is characteristic of
prokaryotes.
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Plasmid pBR322 has PstI restriction enzyme site
within gene ampR that confers ampicillin resistance. If this enzyme is used for inserting a gene for β-galactoside production and the recombinant plasmid is inserted in an E.coli strain
A
it will not be able to confer ampicillin resistance
to the host cell.
B
the transformed cells will have the ability to resist ampicillin as well as produce β-galactoside.
C
it will lead to lysis of host cell.
D
it will be able to produce a novel protein with dual ability.
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Now a days it is possible to detect the mutated gene causing cancer by allowing radioactive probe to
hybridise its complimentary DNA in a clone of cells,
followed by its detection using autoradiography
because:
A
mutated gene partially appears on a photographic film.
B
mutated gene completely and clearly appears on a photographic film.
C
mutated gene does not appear on a photographic film as the probe has no complimentarity with it.
D
mutated gene does not appear on
photographic film as the probe has complimentarity with it.
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In the exponential growth equationt = N0 ert , e represents:
A
The base of number logarithms
B
The base of exponential logarithms
C
The base of natural logarithms
D
The base of geometric logarithms
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