Which of the following is not a function of proteins?

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which of the following is not a function of proteins?

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which of the following is not a function of proteins?

Answer: All of the options you provided are functions of proteins. Proteins are incredibly diverse molecules with a wide range of functions in living organisms. Here’s a brief explanation of each function:

  1. Catalysis (Enzymes): Proteins serve as enzymes, which are biological catalysts that speed up chemical reactions in cells. Enzymes play a crucial role in various metabolic pathways and cellular processes.

  2. Transport: Certain proteins, such as hemoglobin, transport molecules (like oxygen or ions) throughout the body. Hemoglobin, for example, transports oxygen from the lungs to body tissues.

  3. Cell Signaling: Proteins are involved in cell signaling pathways, transmitting signals within and between cells. Examples include receptor proteins on cell membranes and intracellular signaling proteins.

  4. Immune Defense: Antibodies, a type of protein, play a key role in the immune system’s defense against pathogens (e.g., bacteria, viruses). They bind to and neutralize foreign invaders.

  5. Structural Support: Structural proteins provide support to cells and tissues. Examples include collagen (found in skin, bones, and connective tissues) and keratin (found in hair and nails).

  6. Storage: Some proteins, like ferritin, act as storage molecules for essential substances, such as iron.

  7. Regulation of Gene Expression: Transcription factors are proteins that regulate gene expression by binding to DNA, controlling when and how genes are turned on or off.

  8. Motor Function: Motor proteins, like myosin and kinesin, are responsible for cellular movement. Myosin, for instance, plays a role in muscle contraction.

  9. Antibacterial Defense: Certain proteins, such as lysozyme, have antibacterial properties and help protect against bacterial infections.

  10. Enzymatic Reactions: Proteins can catalyze various enzymatic reactions beyond metabolic processes, such as DNA repair and replication.

Proteins are essential macromolecules with diverse functions, and they are involved in virtually every aspect of cellular and organismal life. None of the options listed can be excluded as a function of proteins.