Week 6 — Quiz (auto-graded) · Cellular Respiration

Course: Introduction to Biology — General Biology I (BIOL 101) · Silver Oak University (fictional sample) · Prof. Castellano
Objective tested: Objective 4 — the overall equation of cellular respiration; the three stages in order and their locations; the role of oxygen; where the most ATP is made; fermentation.
Points: 10 (1 each) · Assignment group: Quizzes (10% of grade) · Due: end of Module 6.

This is the human-readable quiz with its vetted answer key and feedback. The import-ready Classic QTI is in F-quiz-week-06-qti.xml (generated by the shared validated script — parses with 10 items, every single-answer item exactly one correct). The reusable item-bank entries and the Canvas placement block are at the bottom of this file.

Blueprint

No trick questions; distractors target the Week 6 misconceptions named in the lecture outline. No precise-ATP-arithmetic item appears — the overview total (~36–38 ATP) is given in prose only; the quiz tests order, location, and where the most ATP is made.

Questions, key, and feedback

Q1 (MC). Cellular respiration is best described as the process that —
- A. builds glucose from carbon dioxide and water using sunlight
- B. breaks down glucose in a controlled way to capture its energy as ATP ✅
- C. moves air into and out of the lungs
- D. copies a cell's DNA before it divides
Feedback: Cellular respiration breaks glucose down a little at a time and captures the released energy as ATP. (A is photosynthesis — next week; C is breathing; D is DNA replication.)

Q2 (MC). A student says cellular respiration is just another word for breathing. The best correction is that cellular respiration —
- A. is the chemistry inside cells that uses oxygen to make ATP, while breathing moves air in the lungs ✅
- B. happens only in the lungs, while breathing happens in every cell
- C. is exactly the same as breathing, just a fancier term
- D. does not involve oxygen at all
Feedback: Same word, different level. Breathing moves air in and out of the lungs; cellular respiration is the chemistry inside cells that uses that oxygen to make ATP. They're partners, not synonyms.

Q3 (Multiple answer — select all that apply). In aerobic cellular respiration (glucose + O₂ → CO₂ + H₂O + ATP), which of the following are INPUTS (reactants that go IN)?
- A. Glucose (sugar) ✅
- B. Oxygen (O₂) ✅
- C. Carbon dioxide (CO₂)
- D. Water vapor breathed in from the air
- E. ATP
Feedback: The inputs are glucose + oxygen. CO₂, water, and ATP are outputs (products) — CO₂ is the gas you exhale, and ATP is the whole point. Reversing inputs and outputs is the classic mix-up; respiration is roughly the reverse of photosynthesis.

Q4 (Matching). Match each part of cellular respiration to where it happens or what it does.
| Part | Correct match |
|---|---|
| Glycolysis | Happens in the cytoplasm; splits glucose into 2 pyruvate (no oxygen needed) |
| Krebs (citric-acid) cycle | Happens in the mitochondrial matrix; releases carbon dioxide (CO₂) |
| Electron transport chain | Happens on the inner mitochondrial membrane; makes the MOST ATP |
| Fermentation | Happens when there is NO oxygen; lets glycolysis keep making a little ATP |
Feedback: The order is glycolysis → Krebs cycle → electron transport chain, and each has a home: cytoplasm → matrix → inner membrane. The chain makes the most ATP. Fermentation is the no-oxygen backup. Classic errors: putting the Krebs cycle in the cytoplasm, or thinking glycolysis makes the most ATP.

Q5 (MC). Which lists the three stages of cellular respiration in the correct order, first to last?
- A. Krebs cycle → glycolysis → electron transport chain
- B. Electron transport chain → Krebs cycle → glycolysis
- C. Glycolysis → Krebs cycle → electron transport chain ✅
- D. Glycolysis → electron transport chain → Krebs cycle
Feedback: Glycolysis → Krebs cycle → electron transport chain ("G, K, E"). Glucose is split first in the cytoplasm; the chain — where oxygen waits — comes last.

Q6 (MC). Which stage of cellular respiration produces the MOST ATP?
- A. Glycolysis
- B. The Krebs (citric-acid) cycle
- C. The electron transport chain ✅
- D. Lactic-acid fermentation
Feedback: The chain makes the most. Glycolysis and the Krebs cycle each net only about 2 ATP and mainly load up the electron carriers (NADH/FADH₂); the electron transport chain cashes those in for the big batch of ATP.

Q7 (MC). What is the role of oxygen (O₂) in aerobic cellular respiration?
- A. It is split apart during glycolysis to release energy
- B. It is the final electron acceptor at the end of the electron transport chain ✅
- C. It is produced as a waste product and breathed out
- D. It is used in the cytoplasm to start breaking down glucose
Feedback: Oxygen waits at the very end of the electron transport chain to catch the spent electrons and join with hydrogen to form water — the final electron acceptor. It is not used in glycolysis (that stage is anaerobic), and it is a reactant, not a waste product (that's CO₂).

Q8 (True / False). "Plants do not carry out cellular respiration because they make their own food by photosynthesis."
- True
- False ✅
Feedback: False. Plants do both. They build sugar by photosynthesis and burn it by cellular respiration around the clock, including at night when there's no light. Making food and using it for ATP are two different jobs.

Q9 (MC). In a eukaryotic cell, where does glycolysis take place?
- A. In the cytoplasm (cytosol) ✅
- B. In the mitochondrial matrix
- C. On the inner mitochondrial membrane
- D. Inside the nucleus
Feedback: Glycolysis happens in the cytoplasm, outside the mitochondrion, and needs no oxygen. The Krebs cycle (matrix) and the electron transport chain (inner membrane) are the mitochondrial stages.

Q10 (MC). During a hard sprint, a muscle cell runs short of oxygen and switches to fermentation. Which product builds up and contributes to the burning, fatigued feeling?
- A. Lactic acid ✅
- B. Ethanol (alcohol)
- C. Glucose
- D. Oxygen
Feedback: Muscle cells do lactic-acid fermentation when oxygen runs low; lactic acid accumulates and adds to that burn. (Yeast ferments differently — to ethanol + CO₂ — which is what inflates the balloon in this week's lab.)

Answer key (quick reference)

Quality gate (self-checked): each single-answer item has exactly one correct option (the QTI parse-check confirms 8/8 single-answer items one-correct across 10 total); the multiple-answer item lists the two true inputs (A, B) and requires C, D, and E to be left unselected; the matching item pairs four parts to four distinct location/output statements; no item asserts a fact outside the Week 6 course definitions. Week 6 is conceptual: there is no computation in this quiz, and — per the week's design — no precise-ATP-arithmetic item; the overview total (~36–38 ATP) appears in prose only. The lab's qualitative CO₂ trend was re-verified in a Python check (more sugar → more CO₂, monotonic; no sugar → no gas; diminishing returns at high substrate) — see the lab file's quality-gate line.

Item-bank entries (for variants + the midterm/final)

All ten items are tagged course=BIOL101 · week=6 · objective=4 · topic=cellular-respiration and deposited in Item Bank: Week 6 — Cellular Respiration. The final (Week 16) and the per-term variant updates draw fresh items from this bank. (Tags: q1 what-is-respiration, q2 respiration-vs-breathing, q3 inputs-outputs, q4 stage-location-match, q5 stage-order, q6 most-atp-etc, q7 oxygen-final-acceptor, q8 plants-respire, q9 glycolysis-location, q10 lactic-acid-fermentation.)

Canvas placement block

canvas_object   = Quizzes::Quiz
title           = "Week 6 Quiz — Cellular Respiration"
assignment_group = "Quizzes"
points_possible = 10
grading_type    = points
due_offset_days = 5        # 5 days after module start (Sun Oct 11)
published       = true
shuffle_answers = true
provenance      = "~ Prof. Castellano's edition · Fall 2026 · built with thecoursemaker.com"