The correct statements are:
A. Activation energy for enzyme catalysed hydrolysis of sucrose is lower than that of acid catalysed hydrolysis.
B. During denaturation, secondary and tertiary structures of a protein are destroyed but primary structure remains intact.
C. Nucleotides are joined together by glycosidic linkage between and carbons of the pentose sugar
D. Quaternary structure of proteins represents overall folding of the polypeptide chain.
Choose the correct answer from the options given below:
- A
A, C and D Only
- B
A, B and D Only
- C
A and B Only
- D
B and C Only
(A) Enzymes lower the activation barrier far more efficiently than mineral-acid catalysis. True.
(B) Denaturation disrupts hydrogen bonding and disulfide interactions (secondary/tertiary), leaving the covalent peptide-bond sequence (primary) intact. True.
(C) Nucleotides are linked by phosphodiester bonds between C-3′ and C-5′ of adjacent sugars — not by glycosidic linkages between C-1 and C-4. False. (The C1–C4 glycosidic linkage describes polysaccharides like starch, not nucleic acids.)
(D) Overall folding of a single polypeptide chain is the tertiary structure; quaternary structure refers to the assembly of multiple subunits. False.
Only A and B are correct.
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