Examkin

Soru

Zorluk: ZorMust Be True / Most Strongly Supported

In mammalian cellular physiology, any cell undergoing mitochondrial autophagy activates the Parkin-dependent ubiquitination pathway unless it has sustained severe disruption of its inner membrane electrochemical gradient. Every cell that activates the Parkin-dependent ubiquitination pathway produces elevated levels of phosphorylated ubiquitin. Furthermore, any cell that exhibits lysosomal membrane permeabilization suffers severe disruption of its inner membrane electrochemical gradient, and no cell producing elevated levels of phosphorylated ubiquitin can initiate caspase-independent apoptosis.

If the statements above are true, which one of the following must also be true?

  1. A
    Any cell that does not initiate caspase-independent apoptosis is currently undergoing mitochondrial autophagy.
  2. B
    Every cell that sustains severe disruption of its inner membrane electrochemical gradient inevitably initiates caspase-independent apoptosis.
  3. Any cell undergoing mitochondrial autophagy that initiates caspase-independent apoptosis has sustained severe disruption of its inner membrane electrochemical gradient.Cevap
  4. D
    Activation of the Parkin-dependent ubiquitination pathway is a necessary condition for preventing severe disruption of the inner membrane electrochemical gradient.
  5. E
    Cells that exhibit lysosomal membrane permeabilization will produce elevated levels of phosphorylated ubiquitin whenever they undergo mitochondrial autophagy.

Cevap

Any cell undergoing mitochondrial autophagy that initiates caspase-independent apoptosis has sustained severe disruption of its inner membrane electrochemical gradient.
The stimulus establishes a strict conditional chain: if a cell undergoes mitochondrial autophagy and lacks severe inner membrane electrochemical gradient disruption, it must activate the Parkin-dependent ubiquitination pathway, which in turn guarantees elevated phosphorylated ubiquitin, thereby precluding caspase-independent apoptosis. Via contrapositive deduction, any cell that initiates caspase-independent apoptosis cannot satisfy both initial conditions; therefore, if such a cell is indeed undergoing mitochondrial autophagy, it must have sustained severe disruption of its inner membrane electrochemical gradient.

Adım Adım Çözüm

1
Formalize the conditional statements and exception rules in the stimulus.
Autophagy AND (No Gradient Disruption) implies Parkin Activation; Parkin Activation implies Elevated Phosphorylated Ubiquitin; Elevated Phosphorylated Ubiquitin implies No Caspase-Independent Apoptosis.
Translating the prose into structured conditional links clarifies the logical pathway and reveals the trigger conditions.
2
Chain the valid implications to form a composite deductive rule.
(Autophagy AND No Gradient Disruption) implies No Caspase-Independent Apoptosis.
Transitive linking across the intermediate terms (Parkin Activation and Phosphorylated Ubiquitin) connects the starting physiological states directly to the terminal apoptotic consequence.
3
Derive the contrapositive of the composite conditional statement.
If a cell initiates Caspase-Independent Apoptosis, it is NOT the case that (Autophagy AND No Gradient Disruption). For a cell that is undergoing Autophagy, it MUST have sustained Severe Gradient Disruption.
The contrapositive of any valid conditional statement is logically equivalent and necessarily true.

Anahtar Kavram

Deductive Conditional Chaining and Contrapositive Synthesis
Tahmini Süre:2m 0s
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Konular

Must Be True / Most Strongly Supported

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