Course: Introduction to Biology — General Biology I (BIOL 101) · Silver Oak University (fictional sample) · Prof. Castellano
Module: Week 6 of 16 · Fall 2026 · in-person, two 75-minute lectures + one weekly lab
Objective covered: Objective 4 — Trace how cells harvest energy from glucose: the stages of cellular respiration in order, where each happens, and where the most ATP is made.

This file holds two pieces: (A) the Module 6 Overview page ("Start Here") and (B) the Welcome Announcement that drips out when the module opens. Dates below assume a Tuesday/Thursday lecture pattern with Week 6 meeting Tue Oct 6 and Thu Oct 8, a lab that same week, and end-of-week work due Sunday Oct 11, 11:59 p.m. Adjust the day-of-week and times to match your section.

(A) Module 6 Overview — Start Here

Welcome to Week 6: Cellular Respiration

This is your home base for the week. Read it first, then work the checklist below from top to bottom. Everything you need is linked inside the module.

Last week you learned that cells run on ATP and that enzymes make reactions go. This week we answer the obvious next question: where does all that ATP actually come from? The short answer is a controlled, step-by-step "burning" of the sugar in your food — cellular respiration — that happens every second in nearly every cell on Earth, including the cells of plants. The big move this week is to learn the three stages in the right order, and the place each one happens: glycolysis in the cytoplasm, the Krebs (citric-acid) cycle in the mitochondrial matrix, and the electron transport chain on the inner mitochondrial membrane — which is where the most ATP is made.

The week's big question

"How does a cell turn the sugar from your lunch into usable energy — and in what order does it happen?"

By Friday you'll be able to write the overall equation, name the three stages in order and where each occurs, say where oxygen comes in (and where it doesn't), and explain what happens when oxygen runs out (fermentation).

By the end of this week, you can…

Use this as a checklist. If you can do all four out loud, you're ready for the quiz.

• [ ] Write the overall equation of cellular respiration — glucose + O₂ → CO₂ + H₂O + ATP — and say in plain words what goes in and what comes out.
• [ ] Put the three stages in order and locate each: glycolysis (cytoplasm) → Krebs / citric-acid cycle (mitochondrial matrix) → electron transport chain (inner mitochondrial membrane).
• [ ] Say where the ATP comes from — a little from glycolysis (net 2) and the Krebs cycle (2), and the most from the electron transport chain — and that O₂ is the final electron acceptor at the very end (not used in glycolysis).
• [ ] Explain fermentation — when there's no O₂, cells fall back on glycolysis plus fermentation (lactic-acid in your muscles, alcohol/CO₂ in yeast) to keep making a little ATP.

What's due this week, and when

Work these in order — each one gets you ready for the next.

Heads-up on the AI tools: you'll use a chatbot to draft and explain, and then you judge its work against what we cover in class. Chatbots routinely put the three stages out of order, claim the most ATP comes from glycolysis, or say O₂ is used in glycolysis. Catching the model is the point — in the tutorial, the assignment, and the lab.

Late policy reminder: 10% off per day late. If life happens, reach out before the deadline — I'd much rather hear from you early.

How to succeed this week

• Lead with the idea, not the jargon. Cellular respiration is just your cells slowly burning sugar to charge their batteries. The three fancy stage names come after that picture is clear.
• Memorize two tiny hooks. "Glycolysis, Krebs, Electron transport — in that order." And "The chain makes the most." (The electron transport chain makes far more ATP than the first two stages combined.)
• Practice the order out loud. Recite the three stages and their locations until it's automatic — that exact move is the matching question on the quiz and the first problem on the assignment.
• Don't chase the exact ATP number. You'll see the overview total written as roughly 36–38 ATP per glucose; that range is fine. We are not quizzing precise ATP arithmetic — we're quizzing the order, the locations, and where the most ATP is made.
• Treat the chatbot as a smart intern, not an oracle. It drafts; you check. That habit is the whole semester in miniature.

You don't need to memorize every enzyme — this is an overview of the pathway, not a biochemistry course. Come to class ready to figure out why a hard sprint makes your muscles burn. See you Tuesday.

(B) Welcome Announcement — Module 6

Release setting: post on the module's start day (offset = 0 days), i.e., Tue Oct 6, 2026 — not before. If your platform won't preserve the scheduled date on import, post this as a draft labeled "Release: Tue Oct 6."

Subject: Week 6 — where does your energy actually come from? 🔋

Hi everyone,

Quick question to start: when you eat a sandwich, how does that turn into the energy to walk to class? You already know the answer ends in ATP (Week 5). This week we trace the whole path — the slow, controlled "burning" of sugar that nearly every cell on Earth runs every second, called cellular respiration.

This week — Cellular Respiration — we tackle the big question: How does a cell turn the sugar from your lunch into usable energy, and in what order does it happen? The key skill is getting the three stages in the right order and knowing where each one happens: glycolysis (in the cytoplasm) → the Krebs / citric-acid cycle (in the mitochondrial matrix) → the electron transport chain (on the inner mitochondrial membrane), which makes the most ATP. Oxygen shows up at the very end as the final electron acceptor — not at the start.

Three things not to miss:
1. Lecture Tutorial 6 — work through the equation, the three stages in order, the role of O₂, and fermentation with one approved chatbot (Gemini, Claude, or ChatGPT) and submit the share link. You'll catch the model's mistakes — it loves to scramble the order. Due Sun Oct 11.
2. Lab 6 ("Yeast Fermentation"), Quiz 6, Discussion 6, and Assignment 6 also close Sun Oct 11 — the lab uses yeast, sugar, and a balloon, and the CO₂ takes ~30 minutes to build, so start early.
3. Open the Start Here page first — it lays out everything in order with due dates.

One promise: by Friday, the next time your muscles burn at the end of a sprint, you'll know exactly what's happening — your cells ran out of oxygen and switched to fermentation. Yes, plants do respiration too (all the time), and no, respiration is not the same thing as breathing. We'll clear up both.

Bring your curiosity (and maybe a granola bar) to class on Tuesday.

See you soon,
Prof. Castellano