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Negative & Positive Feedback quiz

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  • What is negative feedback in a metabolic pathway?
    Negative feedback is when the final product of a metabolic pathway inhibits an earlier step in the same pathway, slowing or stopping the pathway.
  • How does negative feedback act in a metabolic pathway?
    It acts like a 'red light,' inhibiting the pathway to prevent overproduction of the final product.
  • In the example given, which molecule inhibits the conversion of molecule A to molecule B?
    The final product F inhibits the conversion of molecule A to molecule B.
  • What is the purpose of negative feedback in cells?
    Negative feedback helps limit the production of the final product to prevent excess accumulation.
  • What does the negative sign represent in the context of negative feedback?
    The negative sign represents inhibition, meaning the enzyme's activity is blocked or slowed down.
  • What is positive feedback in a metabolic pathway?
    Positive feedback is when the final product of a metabolic pathway stimulates an earlier step in the same pathway, increasing the pathway's activity.
  • How does positive feedback act in a metabolic pathway?
    It acts like a 'green light,' stimulating the pathway to increase production of the final product.
  • In the positive feedback example, what does product F do?
    Product F stimulates enzyme 1, which increases the production of molecule B and ultimately more product F.
  • When is positive feedback useful for a cell?
    Positive feedback is useful when the cell needs to increase the production of a final product.
  • What does the positive sign represent in the context of positive feedback?
    The positive sign represents stimulation, meaning the enzyme's activity is increased.
  • How does negative feedback affect the overall metabolic pathway?
    It inhibits the entire pathway, leading to decreased production of the final product.
  • How does positive feedback affect the overall metabolic pathway?
    It stimulates the entire pathway, leading to increased production of the final product.
  • What analogy is used to describe negative feedback in metabolic pathways?
    Negative feedback is compared to a red light, signaling the pathway to stop or slow down.
  • What analogy is used to describe positive feedback in metabolic pathways?
    Positive feedback is compared to a green light, signaling the pathway to speed up.
  • What is the main difference between negative and positive feedback in metabolic regulation?
    Negative feedback inhibits an earlier step to limit product formation, while positive feedback stimulates an earlier step to enhance product formation.