GraphIt.now
/
SubjectsTutorialAboutContact

GraphIt.now

Free interactive graphs and simulations for students.

Navigate

  • Home
  • Subjects
  • Tutorial
  • About
  • Contact
  • Patch Notes

Subjects

  • Economics
  • Physics
  • Chemistry
  • Biology
  • Mathematics
  • Engineering

Legal

  • Privacy Policy
  • Terms of Service
  • Contact Us

© 2026 GraphIt.now. All rights reserved.

  1. /
  2. Biology
  3. /
  4. Enzyme Activity
🧬 BiologyGraph

Enzyme Activity

Visualise enzyme activity as a bell-shaped curve against temperature and pH. Adjust the optimum and curve width to explore denaturation effects.

Advanced Editor
Share

Parameters

Key Concepts

  • • Bell-shaped activity curves arise from the balance between increased kinetic energy and enzyme denaturation
  • • Temperature above the optimum → hydrogen bonds and ionic bonds disrupted → denaturation
  • • pH affects ionisation of R-groups in the active site — wrong pH distorts 3D shape
  • • Pepsin (stomach) pH_opt ≈ 2; trypsin (intestine) pH_opt ≈ 8; salivary amylase pH_opt ≈ 7
  • • Thermophile enzymes can function without denaturation at >70°C (e.g., Taq polymerase for PCR)

More Biology Tools

Explore other biology graphs and simulations.

Graph

Logistic Population Growth

Model population growth with a carrying capacity. Adjust growth rate and carrying capacity to see the characteristic S-curve.

Open tool →
Graph

Michaelis-Menten Kinetics

Plot enzyme reaction rate against substrate concentration. Visualise Vmax, Km, and how enzyme kinetics saturate at high substrate levels.

Open tool →
Graph

Survivorship Curves

Compare Type I, II, and III survivorship curves on a logarithmic scale. See how different survival strategies result in characteristic curve shapes.

Open tool →
Graph

Oxygen Dissociation Curve

Plot the sigmoidal haemoglobin-oxygen dissociation curve. See the Bohr shift as pH falls, and compare haemoglobin with myoglobin.

Open tool →
Graph

Photosynthesis Rate

Plot net photosynthesis against light intensity. Identify the compensation point, light saturation, and the effect of CO₂ as a limiting factor.

Open tool →
Simulation

Predator–Prey Dynamics

Simulate Lotka-Volterra predator–prey oscillations. Adjust growth rates and interaction coefficients to see how predator and prey populations cycle.

Open tool →