Practice free Biomolecules (Chemistry) NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
Which feature of DNA contributes to its ability to serve as a better genetic material compared to RNA?
The text states: 'Therefore, DNA chemically is less reactive and structurally more stable when compared to RNA. Therefore, among the two nucleic acids, the DNA is a better genetic material.'
The protein synthesizing machinery has evolved around which nucleic acid?
The NCERT text mentions: 'The protein synthesising machinery has evolved around RNA.' And in the summary, 'Translation is a process that has evolved around RNA, indicating that life began around RNA.'
What is the primary structural difference between the secondary structures of DNA and RNA?
The text states: 'James Watson and Francis Crick gave a double strand helix structure for DNA... In secondary structure of RNA single stranded helics is present which sometimes foldsback on itself.'
Which of the following criteria for a genetic material is better fulfilled by DNA than by RNA?
The text lists criteria for genetic material and states: 'The genetic material should be stable enough not to change with different stages of life cycle... Therefore, DNA chemically is less reactive and structurally more stable when compared to RNA. Therefore, among the two nucleic acids, the DNA is a better genetic material.'
In the context of genetic material and evolution, what is the implication of RNA's higher mutation rate?
The context highlights: 'RNA being unstable, mutate at a faster rate. Consequently, viruses having RNA genome and having shorter life span mutate and evolve faster.'
A nucleotide is composed of which three components?
The NCERT text explicitly states: 'A nucleotide has three components – a nitrogenous base, a pentose sugar (ribose in case of RNA, and deoxyribose for DNA), and a phosphate group.'
Which of the following describes the primary structure of a protein during denaturation?
According to the NCERT text, 'During denaturation secondary and tertiary structures are destroyed but primary structure remains intact.' This means the sequence of amino acids linked by peptide bonds is not broken in denaturation.
What is the common consequence of subjecting a native protein to a physical change like increased temperature or a chemical change like altered pH?
The NCERT states, 'When a protein in its native form, is subjected to physical change like change in temperature or chemical change like change in pH, the hydrogen bonds are disturbed. Due to this, globules unfold and helix get uncoiled and protein loses its biological activity. This is called denaturation of protein.'
Which of the following events occur during the denaturation of a protein?
The NCERT text explicitly mentions, 'When a protein in its native form, is subjected to physical change like change in temperature or chemical change like change in pH, the hydrogen bonds are disturbed. Due to this, globules unfold and helix get uncoiled and protein loses its biological activity.'
Which of the following is an example of protein denaturation?
The NCERT provides, 'The coagulation of egg white on boiling is a common example of denaturation.'
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