"A student extracts pepsin from a pig stomach and adds it to a protein solution at pH 7. No digestion occurs. She then adds HCl to reach pH 2. Still no digestion. What is the most likely explanation?" A) Pepsin denatured irreversibly at pH 7 B) Pepsin requires a cofactor from the stomach lining C) The protein substrate was already denatured D) Pepsin is a zymogen and was never activated The rangkuman did not warn you about pepsinogen (inactive form) activation by HCl. You lose the point. Final Verdict & Recommendation | User Profile | Should you use Rangkuman? | | :--- | :--- | | First-time OSN participant (Kabupaten level) | Yes, but only after reading 1 full textbook chapter. Use to memorize terms. | | Provinsi/Nasional level repeater | Yes, as a checklist and formula sheet . Do not study from it. | | Coach/Teacher | Yes, to design your syllabus. Create your own master rangkuman from Campbell. | | Student with <2 weeks left before OSN | Yes, but spend 80% of time on practice problems + answer keys . Rangkuman for 20% (formulas only). |
Search for "Campbell Biology 12th edition - Summary of Key Concepts" (each chapter has a 2-page summary). Translate key terms into Indonesian. rangkuman materi osn biologi sma
Use existing rangkuman as a checklist. For each bullet point, ask: "Can I explain this in 3 sentences to a friend?" If no, go back to textbook. "A student extracts pepsin from a pig stomach
Overall Rating: ★★★☆☆ (3/5) – Useful as a companion, dangerous as a primary source. Still no digestion