University of Michigan
3 MAXE · 171 OIB
M
★ ★
UMICH Department of Ecology & Evolutionary Biology
EST. 1817
ARTES · SCIENTIA · VERITAS
BIO 171 — Exam 3
P H OTO SY N T H E S I S , C E L LU L A R R E S P I RAT I O N & M E TA B O L I C PAT H W AYS
INSTITUTION University of Michigan COURSE CODE BIO 171
PROGRAM Ecology & Evolutionary Biology ACADEMIC YEAR
EXAM TITLE BIO 171 Exam 3 — Photosynthesis TOTAL QUESTIONS 200 Questions
& Cellular Respiration
COURSE TITLE Introductory Biology: Ecology & FORMAT Multiple Choice — Select the
Evolutionary Biology Single Best Answer
EXAMINATION INSTRUCTIONS
▸ Select the single best answer for each question.
▸ Questions cover photosynthesis (light reactions, Calvin cycle, C3/C4/CAM plants) and cellular respiration
(glycolysis, citric acid cycle, oxidative phosphorylation).
▸ Content is aligned with University of Michigan BIO 171 Exam 3 objectives.
▸ Correct answers and detailed rationales appear below each question for comprehensive exam
preparation.
, BIO 171 EXAM 3 — PHOTOSYNTHESIS, LIGHT
Questions 1 – 200
REACTIONS, CALVIN CYCLE & CELLULAR RESPIRATION
1. What are the two parts of photosynthesis?
A. Light-dependent reaction and Calvin Cycle
B. Glycolysis and Citric Acid Cycle
C. Oxidative phosphorylation and fermentation
D. Electron transport chain and ATP synthase
CORRECT ANSWER A — Light-dependent reaction and Calvin Cycle
RATIONALE Per the source material, photosynthesis consists of two main parts: the light-
dependent reactions (which capture light energy and produce ATP and NADPH)
and the Calvin Cycle (which uses ATP and NADPH to fix CO2 into sugar). Options B,
C, and D describe cellular respiration processes, not photosynthesis.
2. Where does the light-dependent reaction take place?
A. Stroma
B. Thylakoid membrane
C. Cytoplasm
D. Mitochondrial matrix
CORRECT ANSWER B — Thylakoid membrane
RATIONALE Per the source material, the light-dependent reactions occur in the thylakoid
membrane of chloroplasts, where photosystems II and I, the electron transport
chain, and ATP synthase are embedded. The stroma (option A) is where the Calvin
cycle occurs. The cytoplasm (option C) and mitochondrial matrix (option D) are
not photosynthetic sites.
,3. What is the simplified process of the light-dependent reaction?
A. Sugar → energy
B. Light → energy
C. CO2 → sugar
D. Glucose → pyruvate
CORRECT ANSWER B — Light → energy
RATIONALE Per the source material, the simplified process of the light-dependent reaction is
converting light energy into chemical energy (in the form of ATP and NADPH).
Option A is reversed. Option C describes the Calvin cycle. Option D describes
glycolysis.
4. What are the two forms of energy intermediates produced within the light-dependent
reactions?
A. Glucose and oxygen
B. ATP and NADPH
C. NADH and FADH2
D. G3P and RuBP
CORRECT ANSWER B — ATP and NADPH
RATIONALE Per the source material, the two energy intermediates produced in the light-
dependent reactions are ATP (via photophosphorylation) and NADPH (via
reduction of NADP+). These molecules then power the Calvin cycle. NADH and
FADH2 (option C) are produced in cellular respiration. G3P and RuBP (option D)
are Calvin cycle intermediates.
, 5. Where does the Calvin cycle take place?
A. Thylakoid membrane
B. Stroma
C. Cytoplasm
D. Inner mitochondrial membrane
CORRECT ANSWER B — Stroma
RATIONALE Per the source material, the Calvin cycle occurs in the stroma — the fluid-filled
space surrounding the thylakoid membranes in the chloroplast. The thylakoid
membrane (option A) is where the light reactions occur. The cytoplasm (option C)
is where glycolysis occurs. The inner mitochondrial membrane (option D) is where
oxidative phosphorylation occurs.
6. What is put into the Calvin Cycle?
A. O2
B. CO2
C. Glucose
D. H2O
CORRECT ANSWER B — CO2
RATIONALE Per the source material, CO2 is the carbon source that enters the Calvin cycle. It is
fixed by rubisco onto RuBP to begin the cycle. O2 (option A) is a product of the
light reactions. Glucose (option C) is the ultimate product of photosynthesis. H2O
(option D) is split in the light reactions.
3 MAXE · 171 OIB
M
★ ★
UMICH Department of Ecology & Evolutionary Biology
EST. 1817
ARTES · SCIENTIA · VERITAS
BIO 171 — Exam 3
P H OTO SY N T H E S I S , C E L LU L A R R E S P I RAT I O N & M E TA B O L I C PAT H W AYS
INSTITUTION University of Michigan COURSE CODE BIO 171
PROGRAM Ecology & Evolutionary Biology ACADEMIC YEAR
EXAM TITLE BIO 171 Exam 3 — Photosynthesis TOTAL QUESTIONS 200 Questions
& Cellular Respiration
COURSE TITLE Introductory Biology: Ecology & FORMAT Multiple Choice — Select the
Evolutionary Biology Single Best Answer
EXAMINATION INSTRUCTIONS
▸ Select the single best answer for each question.
▸ Questions cover photosynthesis (light reactions, Calvin cycle, C3/C4/CAM plants) and cellular respiration
(glycolysis, citric acid cycle, oxidative phosphorylation).
▸ Content is aligned with University of Michigan BIO 171 Exam 3 objectives.
▸ Correct answers and detailed rationales appear below each question for comprehensive exam
preparation.
, BIO 171 EXAM 3 — PHOTOSYNTHESIS, LIGHT
Questions 1 – 200
REACTIONS, CALVIN CYCLE & CELLULAR RESPIRATION
1. What are the two parts of photosynthesis?
A. Light-dependent reaction and Calvin Cycle
B. Glycolysis and Citric Acid Cycle
C. Oxidative phosphorylation and fermentation
D. Electron transport chain and ATP synthase
CORRECT ANSWER A — Light-dependent reaction and Calvin Cycle
RATIONALE Per the source material, photosynthesis consists of two main parts: the light-
dependent reactions (which capture light energy and produce ATP and NADPH)
and the Calvin Cycle (which uses ATP and NADPH to fix CO2 into sugar). Options B,
C, and D describe cellular respiration processes, not photosynthesis.
2. Where does the light-dependent reaction take place?
A. Stroma
B. Thylakoid membrane
C. Cytoplasm
D. Mitochondrial matrix
CORRECT ANSWER B — Thylakoid membrane
RATIONALE Per the source material, the light-dependent reactions occur in the thylakoid
membrane of chloroplasts, where photosystems II and I, the electron transport
chain, and ATP synthase are embedded. The stroma (option A) is where the Calvin
cycle occurs. The cytoplasm (option C) and mitochondrial matrix (option D) are
not photosynthetic sites.
,3. What is the simplified process of the light-dependent reaction?
A. Sugar → energy
B. Light → energy
C. CO2 → sugar
D. Glucose → pyruvate
CORRECT ANSWER B — Light → energy
RATIONALE Per the source material, the simplified process of the light-dependent reaction is
converting light energy into chemical energy (in the form of ATP and NADPH).
Option A is reversed. Option C describes the Calvin cycle. Option D describes
glycolysis.
4. What are the two forms of energy intermediates produced within the light-dependent
reactions?
A. Glucose and oxygen
B. ATP and NADPH
C. NADH and FADH2
D. G3P and RuBP
CORRECT ANSWER B — ATP and NADPH
RATIONALE Per the source material, the two energy intermediates produced in the light-
dependent reactions are ATP (via photophosphorylation) and NADPH (via
reduction of NADP+). These molecules then power the Calvin cycle. NADH and
FADH2 (option C) are produced in cellular respiration. G3P and RuBP (option D)
are Calvin cycle intermediates.
, 5. Where does the Calvin cycle take place?
A. Thylakoid membrane
B. Stroma
C. Cytoplasm
D. Inner mitochondrial membrane
CORRECT ANSWER B — Stroma
RATIONALE Per the source material, the Calvin cycle occurs in the stroma — the fluid-filled
space surrounding the thylakoid membranes in the chloroplast. The thylakoid
membrane (option A) is where the light reactions occur. The cytoplasm (option C)
is where glycolysis occurs. The inner mitochondrial membrane (option D) is where
oxidative phosphorylation occurs.
6. What is put into the Calvin Cycle?
A. O2
B. CO2
C. Glucose
D. H2O
CORRECT ANSWER B — CO2
RATIONALE Per the source material, CO2 is the carbon source that enters the Calvin cycle. It is
fixed by rubisco onto RuBP to begin the cycle. O2 (option A) is a product of the
light reactions. Glucose (option C) is the ultimate product of photosynthesis. H2O
(option D) is split in the light reactions.
