10. Which of the following is NOT true of enzymes?

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BlackTom AI · Accepted Answer

Question restatement: The prompt asks which statement is NOT true of enzymes. The provided data includes only one purported option: 'Structure consists of nucleotides joined by phosphate-to-sugar linkages'.

Option analysis (based on the available option):
- Option: 'Structure consists of nucleotides joined by phosphate-to-sugar linkages.' This describes nucleic acids (DNA/RNA), whose backbone is formed by sugar-phosphate bonds between nucleotides. Enzymes, on the other hand, are primarily made of amino acids in proteins, forming polypeptide chains with peptide bonds, and their functional form includes an active site formed by specific folding. While there are RNA enzymes (ribozymes), those are RNA molecules themselves, not proteins, and even then the backbone is still nucleotides linked by phosphodiester bonds, not a protein-like peptide bond structure. Therefore this statement is not true of enzymes.

Why this is incorrect in contrast to enzyme structure: enzymes are defined by their catalytic proteins (mostly), which derive their properties from amino acid composition and three-dimensional folding; the phosphate-sugar-nucleotide backbone is not the defining feature of enzymes. This mismatches the fundamental composition of typical enzymes and, in the case of ribozymes, represents a special exception rather than the general rule.

Why the statement is not true (misconceptions to watch for):
- Confusing nucleic acid structure with protein structure; enzymes are not built from nucleotides linked by phosphate-to-sugar bonds.
- Overgeneralizing a property of nucleic acids to enzymes; while ribozymes exist, their backbone is still nucleotide-based, not protein-based chemistry for the catalytic function described in standard enzyme biology.

In sum, the stated option correctly identifies a characteristic of nucleic acids rather than enzymes, making it NOT true of enzymes. If there were additional options, we would assess each against the established features of enzymes (protein or sometimes RNA catalysts) to determine which is not true.

BIOT5750.39480.202530 Assessment Quiz 1

10. Which of the following is NOT true of enzymes?

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