Enzymes
The Michaelis–Menten equation for enzyme kinetics is: v = (Vmax [S]) / (Km + [S]). When the substrate concentration [S] equals Km, the reaction velocity v is:
Select the correct option:
🔒 Solution Hidden from View
Submit your answer to unlock the detailed step-by-step solution.
More biomolecules Practice Questions
Enzymes can accelerate biochemical reactions by factors of a million or more under mild conditions o...
Enzymes can accelerate biochemical reactions by factors of a million or more under mild conditions o...
Enzymes are:
Enzymes are:
Insulin and glucagon, both secreted by the pancreas, exert opposite effects on the concentration of ...
Insulin and glucagon, both secreted by the pancreas, exert opposite effects on the concentration of ...
A peptide on complete hydrolysis yields glycine, alanine, and valine in equal amounts, and partial h...
A peptide on complete hydrolysis yields glycine, alanine, and valine in equal amounts, and partial h...
Comparing the chemical makeup of RNA with that of DNA reveals two consistent differences in their bu...
Comparing the chemical makeup of RNA with that of DNA reveals two consistent differences in their bu...
A naturally occurring biomolecule is a triester formed from glycerol and three long-chain fatty acid...
A naturally occurring biomolecule is a triester formed from glycerol and three long-chain fatty acid...
Both D-glucose and D-fructose give the same osazone when treated with excess phenylhydrazine, despit...
Both D-glucose and D-fructose give the same osazone when treated with excess phenylhydrazine, despit...
A patient presents with swollen, bleeding gums and slow wound healing, symptoms that historically af...
A patient presents with swollen, bleeding gums and slow wound healing, symptoms that historically af...
A certain alpha-amino acid has a side chain bearing an extra carboxyl group, giving it three ionisab...
A certain alpha-amino acid has a side chain bearing an extra carboxyl group, giving it three ionisab...
In a double-stranded DNA sample, analysis shows that adenine constitutes 30 percent of the total nit...
In a double-stranded DNA sample, analysis shows that adenine constitutes 30 percent of the total nit...
Cooking an egg, adding strong acid to milk, or heating a globular protein all cause the material to ...
Cooking an egg, adding strong acid to milk, or heating a globular protein all cause the material to ...
Starch can be digested by humans for energy, whereas cellulose passes through the human digestive tr...
Starch can be digested by humans for energy, whereas cellulose passes through the human digestive tr...
About This Question
- Subject
- chemistry
- Chapter
- biomolecules
- Topic
- enzymes
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
Vmax/2
Substituting [S] = Km into the Michaelis–Menten equation: v = (Vmax × Km) / (Km + Km) = (Vmax × Km) / (2Km) = Vmax/2. Therefore, Km is defined as the substrate concentration at which the reaction rate is exactly half the maximum velocity (Vmax). A lower Km indicates higher affinity of the enzyme for its substrate.
This medium difficulty chemistry question is from the chapter biomolecules, covering the topic of enzymes. It appeared in the 2025 exam.
Looking for more practice? Explore all chemistry questions or browse biomolecules questions on RankGuru.