Which proteins act as biological catalysts? By Rabia Anum 🌐 Source Biology Knowledge Base ✅ Fact Checked 📊 Difficulty Easy 📅 Last Updated 13 Aug 2026 A. Hormones B. Antibodies C. Enzymes D. Neurotransmitters Check Answer 💡 Explanation: Enzymes speed up chemical reactions in the body without being consumed. 📚 Topics: Biology Science 🎯 Exams: CSS GEN NTS PMS