Question at position 25 Which statement is true concerning the genetic code?DNA is said to specify only the structure of protein.DNA serves as the master blueprint for the synthesis of carbohydrates, lipids and proteins.Protein synthesis plays a small but important part in the metabolic machinery of the cell.The chemical structure of cells is primarily determined by lipids while the physical nature of cells is determined by proteins

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Question at position 25 asks about the genetic code and which statement is true.
Option 1: 'DNA is said to specify only the structure of protein.' This is the most accurate statement among the choices. The genetic code describes how the information in DNA is translated into amino acid sequences that form proteins, which essentially links DNA to protein structure. While DNA does carry information for RNA molecules as well, in the context of the genetic code and protein synthesis, it is correct to say that the code specifies protein structure, making this statement true in the standard teaching about the genetic code.
Option 2: 'DNA serves as the master blueprint for the synthesis of carbohydrates, lipids and proteins.' This overstates DNA’s role. DNA primarily encodes proteins and RNAs; while it indirectly influences the synthesis of various biomolecules, it is not accurate to claim it serves as a master blueprint for all carbohydrates and lipids in addition to proteins.
Option 3: 'Protein synthesis plays a small but important part in the metabolic machinery of the cell.' In cellular metabolism, protein synthesis is a central process, consuming substantial resources and energy, and producing proteins that drive many metabolic pathways. Describing it as only 'small' understates its essential role, making this option incorrect.
Option 4: 'The chemical structure of cells is primarily determined by lipids while the physical nature of cells is determined by proteins' This reverses general biological understanding. Lipids contribute to membranes and chemical properties, but the chemical structure of cells is not primarily determined by lipids alone; proteins and nucleic acids contribute to many structural and functional aspects. The statement is misleading and inaccurate.

In summary, Option 1 aligns most closely with the standard view of the genetic code: DNA directs the synthesis of proteins, linking DNA to protein structure, while the other options present exaggerations or misconceptions about DNA, protein synthesis, and cellular composition.

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