Glycolysis and cellular energy transfer are central to understanding how cells break down glucose and capture usable energy. This Grade 9 Science worksheet explores glycolysis in the cytosol, the conversion of glucose into pyruvate, and the processes that produce ATP and NADH. Students examine how energy investment and energy payoff work together, why the net ATP yield differs from total ATP production, and how NAD+ regeneration connects glycolysis with aerobic and anaerobic pathways.

Trace the pathway from glucose to pyruvate

The reading passage introduces glycolysis as a sequence of enzyme-catalyzed reactions. Students encounter the six-carbon glucose molecule, the formation of two three-carbon pyruvate molecules, and the two phases of the pathway. The energy-investment phase uses ATP to prepare glucose-derived intermediates for further reactions, while the energy-payoff phase transfers phosphate groups directly to ADP through substrate-level phosphorylation.

These details provide a foundation for explaining the difference between ATP consumed and ATP produced. Students work with the figures described in the passage: two ATP molecules are invested, four ATP molecules are produced in total, and the net gain is two ATP per glucose molecule. The resource also addresses the reduction of NAD+ to NADH and the role of NADH in carrying high-energy electrons to other cellular processes.

Apply the concepts in different ways

The worksheet combines reading-based questions with recall, calculation, explanation, and classification tasks. Multiple-choice questions check students' knowledge of glycolysis location, glucose breakdown, ATP investment, substrate-level phosphorylation, NADH, and pyruvate's possible next steps. True-or-false statements revisit key pathway facts, including ATP accounting and the importance of NAD+ regeneration.

Short-answer prompts ask students to describe the overall conversion during glycolysis, explain how ATP use and production determine net yield, and discuss the relationship between NADH and NAD+ regeneration. A labeled diagram, a categorization activity, and a short note provide additional ways to work with the lesson concepts. Together, these tasks give students opportunities to move beyond memorizing terms and explain how the parts of cellular energy metabolism are connected.

Connect glycolysis with cellular respiration

The resource follows the pathway beyond its immediate ATP yield. Students consider how pyruvate can enter mitochondrial pathways for further oxidation under aerobic conditions and how fermentation-related pathways can regenerate NAD+ when oxygen is unavailable or limited. The reading explains how electron transfer allows NADH to be oxidized back to NAD+, helping glycolysis continue. This connection makes the worksheet useful when teaching glucose breakdown alongside the wider topic of metabolism and energy processes.

What's included

• Printable Grade 9 Science worksheet focused on glycolysis and cellular energy transfer.
• Reading passage explaining the pathway, ATP balance, NADH production, pyruvate, and NAD+ regeneration.
• Multiple-choice, true-or-false, short-answer, labeled-diagram, categorization, and short-note activities.
• Separate PDF answer key for checking student responses.
• Student notes lines at the bottom of the worksheet.
• Teacher Guide within the answer key PDF, including Learning Objectives, Teaching Tips, Discussion Questions, and Common Mistakes.

Practical classroom use

Use this glycolysis worksheet to introduce the pathway, reinforce a lesson on cellular respiration, or review ATP production and energy transfer. The reading can establish shared terminology before students answer the questions; the calculation and explanation tasks can then help reveal whether they distinguish total ATP production from net gain. The answer key supports checking, while the accompanying Teacher Guide provides prompts for discussion and areas where students may need clarification. TEKS is named in the resource details; specific standard codes or alignment claims are not provided.