In the polynucleotide chain of DNA, a nitrogenous base is linked to the –OH of:

NEET-(Oct)2020 [Molecular-Basis-of-Inheritance] [class-xii ]

• 2'C pentose sugar
• 3'C pentose sugar
• 5'C pentose sugar
• 1'C pentose sugar
Correct Option: D  [ 1'C pentose sugar ]

Remark:

The term 'Nuclein' for the genetic material was used by:

NEET-(Oct)2020 [Molecular-Basis-of-Inheritance] [class-xii ]

• Franklin
• Meischer
• Chargaff
• Mendel
Correct Option: B  [ Meischer ]

Remark:

Identify the statement which is incorrect.

NEET-(Oct)2020 [Molecular-Basis-of-Inheritance] [class-xii ]

• Sulphur is an integral part of cysteine.
• Glycine is an example of lipids.
• Lecithin contains phosphorus atom in its structure.
• Tyrosine possesses aromatic ring in its structure.
Correct Option: B  [ Glycine is an example of lipids. ]

Remark:

Which is the basis of genetic mapping of human genome as well as DNA finger printing?

NEET-(Oct)2020 [Molecular-Basis-of-Inheritance] [class-xii ]

• Polymorphism in DNA sequence
• Single nucleotide polymorphism
• Polymorphism in hnRNA sequence
• Polymorphism in RNA sequence
Correct Option: A  [ Polymorphism in DNA sequence ]

Remark:

After about how many years of formation of earth, life appeared on this planet?

NEET-(Oct)2020 [Evolution] [class-xii ]

• 500 billion years
• 50 million years
• 500 million years
• 50 billion years
Correct Option: C  [ 500 million years ]

Remark:

Embryological support for evolution was proposed by:

NEET-(Oct)2020 [Evolution] [class-xii ]

• Ernst Heckel
• Karl Ernst von Baer
• Charles Darwin
• Alfred Wallace
Correct Option: A  [ Ernst Heckel ]

Remark:

The phenomenon of evolution of different species in a given geographical area starting from a point and spreading to other habitats is called:

NEET-(Oct)2020 [Evolution] [class-xii ]

• Saltation
• Co-evolution
• Natural selection
• Adaptive radiation
Correct Option: D  [ Adaptive radiation ]

Remark:

A Hominid fossil discovered in Java in 1891, now extinct, having cranial capacity of about 900 cc was:

NEET-(Oct)2020 [Evolution] [class-xii ]

• Homo erectus
• Neanderthal man
• Homo sapiens
• Australopithecus
Correct Option: A  [ Homo erectus ]

Remark:

Match the following columns and select the correct option:

NEET-(Oct)2020 [Human-Health-and-Disease] [class-xii ]

• (I)-(D), (II)-(C), (III)-(A), (IV)-(B)
• (I)-(C), (II)-(D), (III)-(B), (IV)-(A)
• (I)-(A), (II)-(C), (III)-(B), (IV)-(D)
• (I)-(A), (II)-(B), (III)-(D), (IV)-(C)
Correct Option: A  [ (I)-(D), (II)-(C), (III)-(A), (IV)-(B) ]

Remark:

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:

NEET-(Oct)2020 [Human-Health-and-Disease] [class-xii ]

• Passive immunity
• Active immunity
• Acquired immunity
• Autoimmunity
Correct Option: A  [ Passive immunity ]

Remark: