Enzyme Lab Executive Summary

Null hypothesis (H₀): No significant difference between enzyme rates in warm vs. room temperature.
Alternative hypothesis (H₁): Warm temperature increases enzyme rate.
Graph: Warm slope slightly steeper than room (0–5 min).
SEM analysis: Error bars overlap (warm: 0.705–1.145; room: 0.772–0.972) → not statistically significant → fail to reject H₀ → no clear effect of warmth.
Molecular reasoning: Higher temperature raises kinetic energy, boosting collision frequency and transient enzyme–substrate binding.

Null hypothesis (H₀): Cold temperature has no effect on enzyme rate.
Alternative hypothesis (H₁): Cold temperature slows enzyme rate.
Graph: Cold slope slightly shallower than room.
SEM analysis: Error bars overlap → not statistically significant → fail to reject H₀ → cold did not produce a clear slowdown with this sample size.
Molecular reasoning: Lower temperature reduces kinetic energy, decreasing collision frequency at the active site.

Null hypothesis (H₀): No significant difference between boiling vs. room temperature.
Alternative hypothesis (H₁): Boiling temperature slows enzyme activity.
Graph: Boiling curve flat compared to steep room‐temperature slope.
SEM analysis: No overlap in 95% CI at 5 min → statistically significant decrease → reject H₀, support H₁ → boiling denatures enzyme.
Molecular reasoning: Extreme heat breaks hydrogen bonds in peroxidase, distorting its active site and preventing substrate binding.

Null hypothesis (H₀): pH < 3 has no effect on peroxidase rate.
Alternative hypothesis (H₁): Strong acid lowers enzyme rate.
Graph: Acidic curve nearly flat vs. control ramp.
SEM analysis: No overlap at 5 min between acidic and neutral CIs → significant slowdown → reject H₀, support H₁.
Molecular reasoning: Excess H⁺ protonates (to add a proton, which can alter chemical properties) side chains, breaks ionic bonds, and unfolds peroxidase, blocking substrate access.

Null hypothesis (H₀): pH 10 has no effect on peroxidase rate.
Alternative hypothesis (H₁): Strong base alters enzyme rate.
Graph: Basic curve flat compared to linear control.
SEM analysis: Baseline CI (0.768–0.976) vs. pH 10 CI (–0.003–0.031) do not overlap → significant effect → reject H₀, support H₁.
Molecular reasoning: Excess OH⁻ disrupts ionic bonds in the active site, unfolding peroxidase and preventing H₂O₂ binding.

Null hypothesis (H₀): No rate difference between high vs. baseline enzyme concentration.
Alternative hypothesis (H₁): Higher concentration increases rate.
Graph: High-conc. slope marginally steeper than control.
SEM analysis: Overlap at 5 min (CI overlap ~0.526) → not significant → fail to reject H₀ → insufficient sample size to detect effect.
Molecular reasoning: More enzyme molecules mean more active sites, but small N limits statistical power.

Null hypothesis (H₀): No rate difference between low vs. baseline concentration.
Alternative hypothesis (H₁): Lower concentration slows rate.
Graph: Low-conc. slope much shallower than control.
SEM analysis: Control CI (0.768–0.976) vs. low-conc. CI (0.092–0.364) do not overlap → significant slowdown → reject H₀, support H₁.
Molecular reasoning: Fewer enzyme molecules reduce collision probability, lowering overall turnover.

Next Steps & Considerations