O Level Biology Study App | O Level Biology Quiz e-Book PDF

O Level Biology MCQs (O Level) From Textbook

O Level Biology MCQs – Certification Test 112

O Level Biology Quiz (Question 112) – App & e-Book Download

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MCQ 112: Polypeptides are converted into amino acids through:

  1. pepsin
  2. trypsin
  3. erepsin
  4. rennin

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