Preparatory phase reactions — Flashcards

START FOR FREE

Preparatory phase reactions — Flashcards

10 flashcards

Read Study Notes Questions

Hexokinase is regulated via negative feedback by _____

Which two steps of glycolysis produce ATP?

Phosphofructokinase-2 (PFK-2) is activated by the hormone _____

Anaerobic glycolysis produces a net of _____ ATP per glucose molecule

In the liver, Phosphofructokinase-2 (PFK-2) is inhibited by the hormone _____

What is the rate-limiting enzyme of glycolysis?_____

What is the function of the bifunctional enzyme Phosphofructokinase-2/Fructose bisphosphatase-2 (PFK-2/FBP-2)?

Where does glycolysis take place?

What is the rate-limiting enzyme of glycolysis?

#10

What enzyme converts pyruvate to lactate?

Preparatory phase reactions US Medical PG Flashcards - Medical Study Cards

Master Preparatory phase reactions with OnCourse flashcards. These spaced repetition flashcards are designed for medical students preparing for NEET PG, USMLE Step 1, USMLE Step 2, MBBS exams, and other medical licensing examinations.

Preparatory phase reactions Flashcard Deck - 10 Cards

Flashcard 1: Hexokinase is regulated via negative feedback by _____

Answer: glucose-6-phosphate

Flashcard 2: Which two steps of glycolysis produce ATP?

Answer: 1. 1,3-bisphosphoglycerate → 3-phosphoglycerate (catalyzed by phosphoglycerate kinase) 2. Phosphoenolpyruvate → pyruvate (catalyzed by pyruvate kinase)

Extra: These steps are examples of substrate-level phosphorylation. Although 4 ATP are produced in total during the payoff phase, the net gain of glycolysis is 2 ATP (because 2 ATP are consumed in the investment phase).

Flashcard 3: Phosphofructokinase-2 (PFK-2) is activated by the hormone _____

Answer: Insulin

Extra: In the fed state, insulin leads to the dephosphorylation of the PFK-2/FBPase-2 bifunctional enzyme, which activates the PFK-2 domain. This increases Fructose-2,6-bisphosphate (F-2,6-BP) levels, which is the most potent allosteric activator of PFK-1 (the rate-limiting enzyme of glycolysis).

Flashcard 4: Anaerobic glycolysis produces a net of _____ ATP per glucose molecule

Answer: 2

Flashcard 5: In the liver, Phosphofructokinase-2 (PFK-2) is inhibited by the hormone _____

Answer: Glucagon

Flashcard 6: What is the rate-limiting enzyme of glycolysis?_____

Answer: Phosphofructokinase-1 (PFK-1)

Flashcard 7: What is the function of the bifunctional enzyme Phosphofructokinase-2/Fructose bisphosphatase-2 (PFK-2/FBP-2)?

Answer: A bifunctional enzyme that regulates the levels of Fructose-2,6-bisphosphate (F-2,6-BP), thereby balancing glycolysis and gluconeogenesis.

Extra: In the well-fed state, PFK-2 is active (increased F-2,6-BP) → stimulates Glycolysis.\nIn the fasting state, FBP-2 is active (decreased F-2,6-BP) → stimulates Gluconeogenesis.

Flashcard 8: Where does glycolysis take place?

Answer: cytoplasm

Flashcard 9: What is the rate-limiting enzyme of glycolysis?

Answer: Phosphofructokinase-1 (PFK-1)

Extra: The three irreversible steps of glycolysis are catalyzed by:\n1. Hexokinase/Glucokinase\n2. Phosphofructokinase-1 (Rate-limiting step)\n3. Pyruvate kinase\n\nPFK-1 is inhibited by ATP and Citrate, and activated by AMP and Fructose-2,6-bisphosphate.

Flashcard 10: What enzyme converts pyruvate to lactate?

Answer: lactate dehydrogenase (LDH)

Keywords: Preparatory phase reactions flashcards, medical flashcards, NEET PG preparation, USMLE Step 1 flashcards, Anki alternative, spaced repetition medical, OnCourse flashcards

Preparatory phase reactions Flashcards for USMLE

Study 10 flashcards on Preparatory phase reactions for USMLE Biochemistry. These active recall cards cover the key concepts, clinical associations, and high-yield facts from this chapter of Glycolysis. Each card is designed to test your understanding rather than just recognition, building stronger and more durable memories for exam day.

For personalised spaced repetition scheduling and unlimited flashcards, download the Oncourse app.

Frequently Asked Questions

Are Preparatory phase reactions flashcards free?

Yes, all flashcards on this page are completely free. You can study all 10 cards at no cost. For spaced repetition scheduling, download the Oncourse app.

How many flashcards does this chapter have?

There are 10 flashcards for Preparatory phase reactions, covering the key concepts, clinical correlations, and high-yield facts from this chapter of Glycolysis.

How should I use these flashcards for USMLE?

Read through each prompt and try to answer before revealing the back of the card. This active recall approach builds stronger memories than passive reading. Combine flashcards with the study notes and MCQ practice for the best results.

Are there more flashcards for Glycolysis?

Yes. This page covers one chapter of Glycolysis. Visit the topic page to see all chapters and their flashcards under Biochemistry.

Want unlimited flashcards?

Get full access to all flashcards, spaced repetition, and progress tracking.

Start For Free

Scan to download app