nmdcat.online
BIO NMDCAT Factors that Affect the Rate of Enzyme Reactions
nmdcat.online July 11, 2026

In an experiment, an enzyme shows maximum activity at pH 8.0 and greatly reduced activity at pH 5.0. The most appropriate explanation is

A. The substrate is absent at pH 5.0
B. Catalytic amino acid residues become improperly ionized at pH 5.0
✓
C. Enzyme concentration decreases automatically
D. The enzyme changes into another protein

📝 Explanation

Changes in pH alter the ionization of amino acid side chains, affecting substrate binding and catalytic function.

📖 Additional Information

  • The substrate is absent at pH 5.0
  • Catalytic amino acid residues become improperly ionized at pH 5.0
  • Enzyme concentration decreases automatically
  • The enzyme changes into another protein

Changes in pH alter the ionization of amino acid side chains, affecting substrate binding and catalytic function.

🔗 Share This Question

Facebook Twitter LinkedIn WhatsApp

🧭 Navigate Questions

Previous Question

During enzyme-catalyzed reactions, the reaction rate increases with temperature only up to the optimum because

Next Question

An increase in enzyme concentration fails to increase reaction rate when

Back to All Questions

🔗 Related MCQs

An increase in the incidence of ectopic pregnancies within a population can often be epidemiologically correlated with a prior increase in the prevalence of which sexually transmitted disease?
July 16, 2026
In the life cycle of Herpes Simplex Virus 2 (HSV-2), the virus travels along nerve fibers to reach the sensory ganglia. The cellular mechanism responsible for this retrograde transport utilizes:
July 16, 2026
A defining characteristic of the lesions associated with the secondary stage of syphilis is that they:
July 16, 2026
The causative agent of genital herpes, HSV-2, is enveloped. The biological significance of this viral envelope in the context of transmission is that it makes the virus:
July 16, 2026
The structural basis for the severe cardiovascular complications seen in tertiary syphilis, such as aortic aneurysms, is the chronic inflammation and destruction of:
July 16, 2026

Categories

View all →