📚 Topic Summary
Glycolysis, derived from the Greek words for 'sweet' and 'splitting,' is the metabolic pathway that converts glucose ($C_6H_{12}O_6$) into pyruvate ($C_3H_4O_3$), a three-carbon molecule, and produces ATP (energy) and NADH (a reducing agent) in the process. It's a fundamental process for both aerobic and anaerobic organisms and occurs in the cytoplasm of the cell. Glycolysis involves a series of ten enzymatic reactions, each catalyzing a specific step in the breakdown of glucose. Understanding these steps and their regulation is crucial for understanding cellular respiration and energy production.
🧪 Part A: Vocabulary
Match the following terms with their correct definitions:
- Term: ATP
- Term: Pyruvate
- Term: Glucose
- Term: NADH
- Term: Kinase
- Definition: A six-carbon sugar that serves as the primary fuel for glycolysis.
- Definition: An enzyme that catalyzes the transfer of phosphate groups from high-energy, phosphate-donating molecules to specific substrates.
- Definition: A high-energy molecule used by cells for energy storage and transfer.
- Definition: A three-carbon molecule that is the end product of glycolysis.
- Definition: A reduced form of nicotinamide adenine dinucleotide; an electron carrier.
(Match terms with definitions by listing the term number and definition number - e.g., 1-C)
🧬 Part B: Fill in the Blanks
Complete the following paragraph by filling in the missing words related to glycolysis:
Glycolysis occurs in the ________ of the cell. The starting molecule, ________, is broken down into two molecules of ________. This process requires an initial investment of ________ ATP molecules but generates a net gain of ________ ATP molecules, along with ________ molecules of NADH. The final product, pyruvate, can then enter the ________ if oxygen is present.
🤔 Part C: Critical Thinking
Explain why glycolysis is considered to be a universal metabolic pathway. What evidence supports this claim?
