Trypsinogen is split by the enzyme enterokinase to form an activated molecule of the protease trypsin. Which of the following would confirm that the activation of trypsin is an example of how a positive feedback mechanism can amplify a biological process?

Question

BlackTom AI · Accepted Answer

Let’s examine what the question is asking: identifying a statement that demonstrates a positive feedback mechanism in the activation of trypsin from trypsinogen by enterokinase.
Option 1: 'If levels of trypsin were to get too high, the trypsin molecules would inhibit the enzyme enterokinase.' This describes negative feedback, where the end product inhibits an upstream activator to limit the response, not amplify it. Therefore, this option does not illustrate positive feedback.
Option 2: 'The trypsin produced by the reaction is capable of splitting and activating additional trypsinogen molecules.' Here, the product (trypsin) accelerates production of more product (more activated trypsin) by activating more trypsinogen. This is the classic hallmark of positive feedback: amplification of the initial signal leading to a greater response.
Option 3: 'The activated trypsin enzyme can use enterokinase as a substrate.' If trypsin were to cleave enterokinase, that would imply a feed-forward interaction or a different enzymatic interaction, but not the self-amplifying loop typical of positive feedback in trypsin activation. Moreover, enterokinase is the activator, not a typical substrate in this context.
Option 4: 'Each mRNA molecule that codes for trypsinogen can be translated repeatedly to form many peptide molecules.' This describes multiple translation events increasing protein quantity, but it does not constitute a regulatory feedback loop in which the product enhances its own formation in the pathway; it’s about expression levels, not an activation cascade that amplifies activity in real time. Therefore, this does not illustrate positive feedback in the activation process.
In summary, option 2 uniquely captures the essence of positive feedback in this enzymatic cascade: the product of the reaction accelerates the production of more product, leading to amplification of the signal.

Trypsinogen is split by the enzyme enterokinase to form an activated molecule of the protease trypsin. Which of the following would confirm that the activation of trypsin is an example of how a positive feedback mechanism can amplify a biological process?单项选择题

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