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NEET Biology (Oct)2020 PYQs
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89 questions in NEET (Oct)2020
In the polynucleotide chain of DNA, a nitrogenous base is linked to the –OH of:
A
2'C pentose sugar
B
3'C pentose sugar
C
5'C pentose sugar
D
1'C pentose sugar
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The term 'Nuclein' for the genetic material was used by:
A
Franklin
B
Meischer
C
Chargaff
D
Mendel
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Identify the statement which is incorrect.
A
Sulphur is an integral part of cysteine.
B
Glycine is an example of lipids.
C
Lecithin contains phosphorus atom in its structure.
D
Tyrosine possesses aromatic ring in its structure.
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Explanation: Option 2 is incorrect. Glycine is an amino acid, not a lipid. NCERT classifies glycine as the simplest amino acid with a side chain of hydrogen. Lipids include fats, oils, and phospholipids like lecithin. Options 1, 3, and 4 are correct: sulfur is part of cysteine's thiol group; lecithin is a phospholipid containing phosphorus; tyrosine has an aromatic ring in its side chain.
🧠 Did You Know? Some amino acids contain sulfur (cysteine and methionine), contributing to disulfide bonds and protein structure.
💡 NCERT Memory Line: Amino acids are the building blocks of proteins; lipids include fats and phospholipids like lecithin, which contain phosphorus.
Which is the basis of genetic mapping of human genome as well as DNA finger printing?
A
Polymorphism in DNA sequence
B
Single nucleotide polymorphism
C
Polymorphism in hnRNA sequence
D
Polymorphism in RNA sequence
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After about how many years of formation of earth, life appeared on this planet?
A
500 billion years
B
50 million years
C
500 million years
D
50 billion years
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Embryological support for evolution was proposed by:
A
Ernst Heckel
B
Karl Ernst von Baer
C
Charles Darwin
D
Alfred Wallace
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The phenomenon of evolution of different species in a given geographical area starting from a point and
spreading to other habitats is called:
A
Saltation
B
Co-evolution
C
Natural selection
D
Adaptive radiation
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A Hominid fossil discovered in Java in 1891, now
extinct, having cranial capacity of about 900 cc was:
A
Homo erectus
B
Neanderthal man
C
Homo sapiens
D
Australopithecus
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Match the following columns and select the correct
option:
Column-I
Column-II
(I)Typhoid
(A)Haemophilus influenzae
(II)Malaria
(B)Wuchereria bancrofti
(III)Pneumonia
(C)Plasmodium vivax
(IV)Filariasis
(D)Salmonella typhi
A
(I)-(D), (II)-(C), (III)-(A), (IV)-(B)
B
(I)-(C), (II)-(D), (III)-(B), (IV)-(A)
C
(I)-(A), (II)-(C), (III)-(B), (IV)-(D)
D
(I)-(A), (II)-(B), (III)-(D), (IV)-(C)
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The yellowish fluid "colostrum" secreted by mammary
glands of mother during the initial days of lactation has abundant antibodies (IgA) to protect the infant. This type of immunity is called as:
A
Passive immunity
B
Active immunity
C
Acquired immunity
D
Autoimmunity
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