Free Enzymes practice for NEET PG and INI-CET Biochemistry, with a written explanation on every question.
7 questions · Free explanations
Showing 1–7 of 7 questions
Q1 · Michaelis Constant
NEET PGMediumExplanation
Km is the substrate concentration at half-maximal velocity. A low Km means the enzyme reaches half of Vmax at low substrate concentration, indicating high affinity for its substrate.
Q2 · Competitive Inhibition
NEET PGMediumExplanation
A competitive inhibitor competes for the active site, raising the apparent Km through reduced affinity, while Vmax is unchanged because high substrate concentrations overcome the inhibition.
Q3 · Cardiac Markers
NEET PGEasyExplanation
Cardiac troponins T and I are the most specific and sensitive markers of myocardial injury, rising within hours and remaining elevated for days. CK-MB is an older marker.
Q4 · Coenzymes
MediumExplanation
Thiamine pyrophosphate, from vitamin B1, is a coenzyme for pyruvate dehydrogenase, alpha-ketoglutarate dehydrogenase and transketolase. B1 deficiency impairs these and causes beriberi and Wernicke encephalopathy.
Q5 · Rate-limiting Enzymes
HardExplanation
HMG-CoA reductase catalyses the rate-limiting step of cholesterol synthesis and is the target of statins. HMG-CoA lyase, by contrast, is involved in ketone body formation.
Q6 · Enzyme Classification
EasyExplanation
Transferases move functional groups such as amino or phosphate groups between substrates; the aminotransferases ALT and AST are examples. Oxidoreductases handle redox reactions and hydrolases cleave bonds using water.
Q7 · Allosteric Regulation
HardExplanation
PFK-1 is inhibited by ATP and citrate, both signals of energy abundance, and activated by AMP and fructose-2,6-bisphosphate. This makes it the main control point of glycolysis.
Enzymes sits within Biochemistry, which carries the same syllabus in both exams. This set runs to 7 questions, each tagged Easy, Medium or Hard, 2 of them at Hard, and 3 drawn from previous-year papers.
Answer first, then read the explanation even on the ones you got right — the reasoning is where Enzymes marks are actually won, and it is what separates a recalled fact from a question you can solve in a new form. Once the Easy set feels comfortable, filter to Hard to find the gaps Biochemistry examiners keep returning to.
FAQ
Yes. Every question and explanation in this Enzymes set is free and open — no login, no form and no payment. The explanation appears the moment you answer.
Enzymes sits within Biochemistry, which appears in the same form in both syllabuses. Metabolism, enzymes and molecular biology, distilled to the pathways and deficiency states that repeat in previous year papers.
No. No account, no password, no OTP. Answer in the browser and your answers stay on your device for the session.