Final Exam — Cumulative (Weeks 1–15) · Objectives 1–8

Course: Introduction to Biology — General Biology I (BIOL 101) · Silver Oak University (fictional sample) · Prof. Castellano
Scope: Cumulative — all eight objectives, Weeks 1–15 (the science of biology · the chemistry of life & macromolecules · cell structure, membranes & transport · energy, enzymes, respiration & photosynthesis · the cell cycle, mitosis & meiosis · Mendelian genetics & patterns of inheritance · DNA, replication & gene expression · gene regulation, mutation & biotechnology).
Format: 25 items, 100 points (4 each) · concept-, scenario-, and quantitative-based · mixed item types (multiple-choice, matching, true/false). Every figure or cross is described in text, so every item is auto-gradable.
Points: 100 · Assignment group: Final (25% of the course grade) · Window: opens at the start of the Week 16 (finals) module; due 6 days later. The final replaces Week 16's quiz, assignment, and lab, and Week 16 has no discussion. AI is not permitted on the Final.

This is the human-readable exam with its vetted answer key and one-line feedback. The import-ready Classic QTI 1.2 is in L-final-week-16-qti.xml (generated by the shared validated Python script — parses with 25 items, every single-answer item exactly one correct). The item-bank / coverage note and the Canvas placement block are at the bottom of this file.

This is the live exam. Its paired ungraded rehearsal — O-practice-final-week-16.md — mirrors this blueprint with fresh variants and shares none of these items.

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Blueprint (items → objective → source week)

Coverage is proportional to teaching time across the whole course: Obj 1 = 3 · Obj 2 = 4 · Obj 3 = 3 · Obj 4 = 4 · Obj 5 = 3 · Obj 6 = 3 · Obj 7 = 3 · Obj 8 = 2 = 25 items. No trick questions; every single-answer item has exactly one correct option; the matching items pair one-to-one. The quantitative items reuse the course's pre-verified genetics ratios, mitotic index, 2ⁿ counts, pH factors, SA:V ratios, and the worked codon-translation example.

#	Type	Concept	Objective	Source week
1	Multiple choice	Characteristics of life — "is it alive?"	1	1
2	Multiple choice	Hypothesis vs. theory / falsifiability	1	1
3	Multiple choice	Controlled experiment — the control group	1	1
4	Multiple choice	pH — fold difference in acidity (quantitative)	2	2
5	Multiple choice	Water's properties — cohesion vs. adhesion	2	2
6	Matching	Macromolecule → monomer (building block)	2	3
7	Multiple choice	Chemical bonds — ionic vs. covalent	2	2
8	Matching	Organelle → function (structure→function)	3	4
9	Multiple choice	Surface-area-to-volume scaling (quantitative)	3	4
10	Multiple choice	Osmosis — water movement	3	4
11	Multiple choice	Enzymes lower activation energy	4	5
12	Matching	Cellular respiration — stage → location/output (process order)	4	6
13	Multiple choice	Photosynthesis — where O₂ comes from	4	7
14	True / False	"Plants don't do respiration" misconception	4	6
15	Matching	Mitosis phases in order — PMAT (process order)	5	9
16	Multiple choice	Mitotic index (quantitative)	5	9
17	Multiple choice	2ⁿ independent assortment (quantitative)	5	10
18	Multiple choice	Monohybrid Tt × Tt phenotype ratio (quantitative)	6	11
19	Multiple choice	Dihybrid both-recessive fraction (quantitative)	6	11
20	Multiple choice	ABO blood-type probability (quantitative)	6	12
21	Multiple choice	DNA base pairing (A–T, G–C)	7	13
22	Multiple choice	Central dogma — codon translation (quantitative)	7	14
23	True / False	Semiconservative replication	7	13
24	Multiple choice	Gel electrophoresis — fragment migration	8	15
25	True / False	"All mutations are harmful" misconception	8	15

Objective totals: Obj 1 = 3 items (12 pts) · Obj 2 = 4 (16) · Obj 3 = 3 (12) · Obj 4 = 4 (16) · Obj 5 = 3 (12) · Obj 6 = 3 (12) · Obj 7 = 3 (12) · Obj 8 = 2 (8) → 25 items, 100 points.

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Questions, key, and feedback

Objective 1 — The Science of Biology (Week 1)

Q1 (MC). A burning campfire releases energy, grows as it spreads, and moves across a field, yet no biologist counts it as a living thing. The single most decisive reason it is not alive is that it —
- A. gives off both heat and light
- B. is not made of cells and carries no DNA or homeostasis ✅
- C. can be put out with water
- D. was started by a human rather than occurring naturally
Feedback: Life is the whole checklist, not any one trait. A flame uses energy and "grows," but it is not made of cells, carries no DNA, and maintains no homeostasis — so matching a couple of traits isn't enough. (A is true but irrelevant; C and D don't bear on the definition of life.)

Q2 (MC). In science, which statement is a testable hypothesis rather than a broad theory or an untestable claim?
- A. The theory of evolution by natural selection
- B. "Tomato seedlings given fertilizer will grow taller over four weeks than seedlings given plain water." ✅
- C. "My garden thrives because the plants can sense that I care about them."
- D. The cell theory
Feedback: A hypothesis is one specific, testable, falsifiable prediction you could check with an experiment (B). A and D are broad, evidence-backed theories; C is not falsifiable — no result could prove or disprove "the plants sense that I care," so it isn't scientific.

Q3 (MC). A biologist tests whether a new plant food increases tomato yield. One greenhouse bench of plants gets the plant food; an otherwise-identical bench gets none. The bench that receives no plant food serves as the —
- A. independent variable
- B. control group ✅
- C. dependent variable
- D. confounding variable
Feedback: The control group is the no-treatment baseline you compare against. The treated bench is the experimental group; without the control, you'd have nothing to measure the effect against. (The independent variable is the plant food itself; the dependent variable is the yield.)

Objective 2 — The Chemistry of Life & Macromolecules (Weeks 2–3)

Q4 (MC). On the pH scale, each whole unit represents a tenfold change in hydrogen-ion (H⁺) concentration. A lemon-juice sample at pH 4 is how many times more acidic (more H⁺) than a sample of pure water at pH 7?
- A. 3 times
- B. 30 times
- C. 100 times
- D. 1000 times ✅
Feedback: Each pH unit is a 10× change in [H⁺], and pH 4 to pH 7 is 3 units: 10³ = 1000× more H⁺ (more acidic). (A counts the units instead of the factor; C is only 2 units, 10² = 100×.) Pre-verified.

Q5 (MC). Water striders walk on a pond's surface and water forms rounded beads on a waxed car because water molecules cling to one another through hydrogen bonds, producing high surface tension. This water-to-water attraction is called —
- A. adhesion
- B. cohesion ✅
- C. a covalent bond forming between two water molecules
- D. evaporation
Feedback: Cohesion is water clinging to itself (water-to-water), the source of surface tension. Adhesion is water clinging to other surfaces (water-to-other — how water climbs a paper towel). (The attractions between separate water molecules are hydrogen bonds, not covalent bonds.)

Q6 (Matching). Match each biological macromolecule to the monomer (building block) it is assembled from. (Note: lipids are NOT polymers of a repeating monomer.)
| Macromolecule | Correct building block |
|---|---|
| Protein | Amino acids |
| Carbohydrate (e.g., starch) | Monosaccharides such as glucose |
| Nucleic acid (DNA/RNA) | Nucleotides |
| Lipid (fat) | Glycerol and fatty acids (not a true repeating monomer) |
Feedback: Proteins are chains of amino acids, carbohydrates of monosaccharides, nucleic acids of nucleotides. Lipids are the exception — they are assembled from glycerol + fatty acids and are not polymers of a single repeating monomer (a classic distractor).

Q7 (MC). In sodium chloride (table salt), one atom transfers an electron completely to another, leaving oppositely charged ions that attract. A bond formed by the complete transfer of electrons from one atom to another is —
- A. a covalent bond
- B. an ionic bond ✅
- C. a hydrogen bond
- D. a peptide bond
Feedback: An ionic bond forms when electrons are transferred, creating charged ions that attract. Don't swap it with a covalent bond, where electrons are shared. (Hydrogen bonds are weak attractions between molecules; a peptide bond joins amino acids.)

Objective 3 — Cell Structure, Membranes & Transport (Week 4)

Q8 (Matching). Match each cell organelle to its primary function.
| Organelle | Correct function |
|---|---|
| Mitochondrion | Carries out cellular respiration to make most of the cell's ATP |
| Ribosome | Site where proteins are assembled (translation) |
| Nucleus | Stores the cell's DNA and directs its activities |
| Chloroplast | Captures light energy to run photosynthesis |
Feedback: This is structure → function: the mitochondrion makes ATP (respiration), the ribosome builds proteins, the nucleus houses DNA, and the chloroplast runs photosynthesis. (Remember: plant cells have both mitochondria and chloroplasts.)

Q9 (MC). Model a cell as a cube. For a cube, surface area = 6s² and volume = s³, so the surface-area-to-volume (SA:V) ratio equals 6/s. As a cube-shaped cell grows from side 1 to side 4, its SA:V ratio —
- A. increases, giving more surface to service each unit of volume
- B. decreases, which is one key reason cells stay small ✅
- C. stays exactly the same at every size
- D. first decreases and then increases
Feedback: SA:V = 6/s, so as s grows the ratio shrinks: side 1 → 6:1, side 2 → 3:1, side 3 → 2:1, side 4 → 1.5:1. Less surface per unit volume is exactly why cells stay small (and use folds/microvilli). Pre-verified.

Q10 (MC). A plant cell is placed in a beaker of pure (hypotonic) water. Which statement correctly describes what happens by osmosis?
- A. Solute particles move out of the cell into the water
- B. Water moves INTO the cell, which swells (held in check by its cell wall) ✅
- C. Water moves OUT of the cell, which shrivels
- D. Nothing moves because pure water contains no solutes
Feedback: Osmosis is the movement of water, not solute. In a hypotonic surrounding (more water outside), water moves into the cell, which swells; a plant cell's rigid cell wall keeps it from bursting. (A wrongly moves solute; C reverses the direction — that's a hypertonic solution.)

Objective 4 — Energy, Enzymes, Respiration & Photosynthesis (Weeks 5–7)

Q11 (MC). An enzyme speeds up a biochemical reaction. It does so by —
- A. being permanently used up, so a new enzyme is needed for each reaction
- B. lowering the activation energy needed for the reaction to proceed ✅
- C. adding heat energy to force the reaction to happen
- D. making a reaction occur that could never happen without it
Feedback: Enzymes are biological catalysts that lower the activation energy, so the reaction goes faster. They are reusable (not consumed — A is the classic error), don't add heat (C), and speed up reactions that can occur, rather than enabling impossible ones (D).

Q12 (Matching). Cellular respiration proceeds in order: glycolysis → Krebs (citric-acid) cycle → electron transport chain. Match each stage to its location and key feature.
| Stage | Correct location & feature |
|---|---|
| Glycolysis | Occurs in the cytoplasm; splits glucose into two pyruvate (net 2 ATP) |
| Krebs (citric-acid) cycle | Occurs in the mitochondrial matrix; releases CO₂ and makes NADH/FADH₂ |
| Electron transport chain | On the inner mitochondrial membrane; O₂ is the final electron acceptor and most ATP is made |
Feedback: Keep the order and location straight: glycolysis in the cytoplasm (net 2 ATP), the Krebs cycle in the matrix (releases CO₂), and the electron transport chain on the inner membrane, where O₂ is the final electron acceptor and the most ATP is produced.

Q13 (MC). During photosynthesis, the oxygen gas (O₂) that a plant releases comes from —
- A. the carbon dioxide (CO₂) the plant takes in
- B. the splitting of water (H₂O) in the light-dependent reactions ✅
- C. the glucose built in the Calvin cycle
- D. the soil minerals absorbed by the roots
Feedback: The O₂ released comes from splitting water (H₂O) in the light-dependent reactions — not from CO₂ (a very common reversal). The CO₂ is fixed into sugar later, in the Calvin cycle.

Q14 (True / False). Because plants carry out photosynthesis, they do not perform cellular respiration.
- True
- False ✅
Feedback: False. Plants do cellular respiration too — all the time, day and night — to release usable energy (ATP) from the sugars they make. Photosynthesis stores energy in glucose; respiration spends it. (Respiration is not the same as "breathing.")

Objective 5 — The Cell Cycle, Mitosis & Meiosis (Weeks 9–10)

Q15 (Matching). Mitosis proceeds in the order Prophase → Metaphase → Anaphase → Telophase (PMAT). Match each phase to its defining event.
| Phase | Correct defining event |
|---|---|
| Prophase | Chromosomes condense and become visible; the nuclear envelope breaks down |
| Metaphase | Chromosomes line up single-file along the cell's middle (metaphase plate) |
| Anaphase | Sister chromatids separate and are pulled to opposite poles |
| Telophase | Two new nuclear envelopes re-form around the separated chromosomes |
Feedback: Use the hook PMAT: Prophase (condense), Metaphase (line up in the middle), Anaphase (apart to the poles), Telophase (two nuclei re-form). Getting the order right is the whole item.

Q16 (MC). In a stained onion-root-tip field of 100 cells, a student counts 80 in interphase, 9 in prophase, 4 in metaphase, 3 in anaphase, and 4 in telophase. The mitotic index (the percentage of cells actively in mitosis) is —
- A. 8%
- B. 20% ✅
- C. 80%
- D. 4%
Feedback: Cells in mitosis = 9 + 4 + 3 + 4 = 20; mitotic index = 20 ÷ 100 × 100 = 20%. (C, 80%, is the interphase fraction — most cells are in interphase, but that's not the mitotic index.) Pre-verified.

Q17 (MC). From independent assortment alone, an organism can produce 2ⁿ genetically different gametes, where n is its haploid chromosome number. An organism with 3 pairs of homologous chromosomes can make how many genetically different gametes?
- A. 3
- B. 6
- C. 8 ✅
- D. 9
Feedback: With n = 3, the number of combinations is 2³ = 8. (B, 6, is 2 × 3; D, 9, is 3².) Crossing over adds even more variation on top of this. Pre-verified.

Objective 6 — Inheritance: Mendelian Genetics & Patterns (Weeks 11–12)

Q18 (MC). In pea plants, tall (T) is dominant to short (t). Two heterozygous tall plants are crossed (Tt × Tt). Reading the completed Punnett square, the expected phenotype ratio of the offspring is —
- A. 1 tall : 2 medium : 1 short
- B. 3 tall : 1 short ✅
- C. 1 tall : 1 short
- D. all tall
Feedback: Tt × Tt gives a genotype ratio of 1 TT : 2 Tt : 1 tt, and since any plant with a T is tall, the phenotype ratio is 3 tall : 1 short. (A is the common trap of reporting the 1:2:1 genotype ratio as the phenotype, plus a fictitious "medium.") Pre-verified.

Q19 (MC). Two pea plants heterozygous for two genes are crossed (TtYy × TtYy), where each gene assorts independently. Using the product rule, the probability that an offspring is recessive for both traits (ttyy) is —
- A. 1/4
- B. 1/9
- C. 1/16 ✅
- D. 9/16
Feedback: Each trait is recessive in 1/4 of offspring, and the genes are independent, so P(both recessive) = 1/4 × 1/4 = 1/16. (D, 9/16, is the chance of being dominant for both.) The full dihybrid ratio is 9 : 3 : 3 : 1. Pre-verified.

Q20 (MC). A father with blood type A (genotype Iᴬ i) and a mother with blood type B (genotype Iᴮ i) have a child. What is the probability the child has blood type O?
- A. 0 (impossible)
- B. 1/4 ✅
- C. 1/2
- D. 3/4
Feedback: The cross Iᴬ i × Iᴮ i gives four equally likely offspring — Iᴬ Iᴮ (AB), Iᴬ i (A), Iᴮ i (B), and ii (O) — so each type, including type O (ii), has probability 1/4. (Type O is possible here because each type-A and type-B parent carries a hidden recessive i.) Pre-verified.

Objective 7 — Molecular Biology: DNA, Replication & Gene Expression (Weeks 13–14)

Q21 (MC). In double-stranded DNA, the nitrogenous bases pair in a specific, complementary way. Adenine (A) always pairs with —
- A. guanine (G)
- B. cytosine (C)
- C. thymine (T) ✅
- D. another adenine (A)
Feedback: The complementary base-pairing rule is A–T and G–C (held together by hydrogen bonds). So adenine pairs with thymine. (A and B mis-pair the bases; G pairs with C.)

Q22 (MC). An mRNA strand reads 5′–AUG GCU UAU UGA–3′. Using the standard genetic code (AUG = Met/start; GCU = Ala; UAU = Tyr; UGA = stop), the protein produced is —
- A. Met – Ala – Tyr (then translation stops) ✅
- B. Met – Ala – Tyr – Stop (a four-amino-acid protein)
- C. Ala – Tyr – Stop
- D. Met – Gly – Phe
Feedback: Reading the codons: AUG = Met (start), GCU = Ala, UAU = Tyr, UGA = stop. The stop codon ends translation and is not an amino acid, so the protein is Met – Ala – Tyr (B wrongly counts "Stop" as a residue; C drops the start; D mis-translates the codons). Pre-verified against the standard codon table.

Q23 (True / False). DNA replication is semiconservative, meaning each new double helix contains one original (old) strand and one newly made strand.
- True ✅
- False
Feedback: True. In semiconservative replication, the helix unzips and each old strand templates a new partner, so every daughter helix is half old, half new. (The disproven alternative — "conservative" replication — would keep both old strands together.)

Objective 8 — Gene Regulation, Mutation & Biotechnology (Week 15)

Q24 (MC). In gel electrophoresis, DNA fragments are pushed through a gel by an electric field. Compared with larger fragments, smaller DNA fragments —
- A. travel FARTHER from the wells because they move more easily through the gel ✅
- B. travel a shorter distance because they are lighter
- C. do not move at all
- D. always stay exactly with the largest fragments
Feedback: Smaller fragments travel farther — they slip through the gel's mesh more easily, while large fragments lag near the wells. This size-sorting is what lets a gel match DNA samples (e.g., in DNA fingerprinting). (B reverses the rule — the classic error.)

Q25 (True / False). All mutations are harmful to an organism.
- True
- False ✅
Feedback: False. Mutations can be harmful, neutral, or even beneficial. Many changes have no effect (silent mutations), and the occasional beneficial mutation is the raw material for evolution. Calling every mutation "bad" is a common misconception.

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Answer key (quick reference)

Q	Answer	Q	Answer
1	B	14	False (plants respire too)
2	B	15	Prophase→condense / Metaphase→line up / Anaphase→separate / Telophase→two nuclei re-form
3	B (control group)	16	B (20% mitotic index)
4	D (1000× — pH 4 vs 7)	17	C (2³ = 8 gametes)
5	B (cohesion)	18	B (3 tall : 1 short)
6	Protein→amino acids / Carb→monosaccharides / Nucleic acid→nucleotides / Lipid→glycerol + fatty acids	19	C (1/16)
7	B (ionic bond)	20	B (1/4 type O)
8	Mitochondrion→ATP / Ribosome→protein synthesis / Nucleus→DNA / Chloroplast→photosynthesis	21	C (A pairs with T)
9	B (SA:V decreases)	22	A (Met–Ala–Tyr, then stop)
10	B (water moves in, cell swells)	23	True (semiconservative)
11	B (lowers activation energy)	24	A (smaller fragments travel farther)
12	Glycolysis→cytoplasm / Krebs→matrix / ETC→inner membrane, O₂ final acceptor	25	False (not all mutations are harmful)
13	B (O₂ from splitting water)

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Quality gate (H5 — self-checked)

• Structure: 25 items, 4 points each, 100 points total; coverage Obj 1 = 3 · Obj 2 = 4 · Obj 3 = 3 · Obj 4 = 4 · Obj 5 = 3 · Obj 6 = 3 · Obj 7 = 3 · Obj 8 = 2 matches the EXAM_BRIEF W16 blueprint exactly.
• Single-answer integrity: every multiple-choice and true/false item (Q1–Q5, Q7, Q9–Q11, Q13, Q14, Q16–Q23, Q24, Q25) has exactly one correct option; the matching items (Q6, Q8, Q12, Q15) pair all rows one-to-one. No multiple-answer items on this form.
• Quantitative gate: PASS. Every numeric answer was re-derived in a scratchpad Python check (0 errors): pH 4 vs 7 → 10³ = 1000× (Q4); cube SA:V = 6/s decreases as the cell grows (Q9); mitotic index = 20/100 → 20% (Q16); 2³ = 8 gametes (Q17); Tt × Tt phenotype 3:1 (Q18); dihybrid ttyy = 1/4 × 1/4 = 1/16 (Q19); Iᴬ i × Iᴮ i → P(type O) = 1/4 (Q20); mRNA AUG-GCU-UAU-UGA → Met-Ala-Tyr then stop (Q22, verified against the standard genetic code). All values reuse the pre-verified numbers from week-specs.md.
• Auto-gradable only: every figure, cross, and field count is described in text; item types are MC / matching / true-false — no free numeric or short-answer entry to mis-key.
• Factual accuracy: real science (Mendel's ratios, the Krebs and Calvin cycles, the central dogma, Chargaff/Watson-Crick base pairing, the standard genetic code) is stated factually; the instructor and institution remain fictional; no licensing or open-source claims appear.
• QTI parse confirmation: L-final-week-16-qti.xml parses as imsqti_xmlv1p2 with 25 items; every single-answer respcondition sets SCORE = 100 on exactly one option; each matching item's four (or three) partial-credit blocks add to 100.
• Integrity vs. the practice final: 0 items are shared with O-practice-final-week-16.md (verified by full stem comparison; the maximum overlap is a same-concept slot — the 2ⁿ item — filled by a different scenario, n = 3 here vs. n = 4 on the practice form).

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Item-bank & coverage note

All 25 items are cumulative variants assembled from the Week 1–15 item banks per Prompt L (changed scenarios and contexts to reduce answer-sharing with the weekly quizzes and the midterm), tagged course=BIOL101 · exam=final · weeks=1–15 · objectives=1–8 and deposited back into the banks for future per-term ($39) regenerations:

Objective	Drawn from banks	Items
1	Week 1 (The Science of Biology)	Q1–Q3
2	Weeks 2–3 (Chemistry of Life; Macromolecules)	Q4–Q7
3	Week 4 (Cell Structure & Function)	Q8–Q10
4	Weeks 5–7 (Energy/Enzymes; Respiration; Photosynthesis)	Q11–Q14
5	Weeks 9–10 (Mitosis; Meiosis)	Q15–Q17
6	Weeks 11–12 (Mendelian Genetics; Patterns of Inheritance)	Q18–Q20
7	Weeks 13–14 (DNA & Replication; Gene Expression)	Q21–Q23
8	Week 15 (Gene Regulation, Mutation & Biotechnology)	Q24–Q25

Each term's update regenerates fresh final variants from these same banks; the paired practice final is regenerated alongside and continues to share none of the live items.

Canvas placement block

canvas_object             = Quizzes::Quiz
title                     = "Final Exam — Cumulative (Weeks 1–15)"
assignment_group          = "Final"
points_possible           = 100
grading_type              = points
available_from_offset_days = 0        # opens at the start of the Week 16 (finals) module
due_offset_days           = 6        # 6 days after module start
published                 = true
allowed_attempts          = 1
shuffle_answers           = true
ai_permitted              = false    # AI is not permitted on the Final
provenance                = "~ Prof. Castellano's edition · Fall 2026 · built with thecoursemaker.com"