Physiology And Metabolism — Part 1 MCQs with Explanations
Practice high-yield Biotechnology Engineering MCQs on Physiology And Metabolism — Part 1 with worked academic solutions for PPSC, FPSC, NIH, NTS.
Questions
40
Difficulty Level
Exam-Level
Target Exams
PPSC, FPSC, NIH...
Estimated Time
48 mins
Exam-Level PPSC FPSC NIH NTS
Verified for Commission Syllabus • Oct 14, 2026
40
Verified Practice Questions
Interactive test mode with detailed academic worked solutions
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Question 1 of 40
★ PPSC
★ FPSC
★ PPSC
★ FPSC
Which one of the following plants exhibits both C3 and C4 pathways?
Correct Answer: Option C — Mesembryanthemum crystallinum
Detailed Academic Explanation:
In physiology and metabolism, Mesembryanthemum crystallinum is the plant that exhibits both C3 and C4 pathways . This plant is commonly known as common ice plant or crystalline ice plant. It is a halophytic plant that has the ability to perform both C3 and CAM (Crassulacean Acid Metabolism) photosynthesis pathways. The C3 pathway is predominant under normal conditions, while the CAM pathway is utilized under conditions of high salinity or water stress. Therefore, Option C is the correct answer.
💡Key Conceptual Anchor:Physiology And Metabolism
Question 2 of 40
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The production of ethanol rather than biomass by yeast cells at high concentration of glucose is known as
Correct Answer: Option C — Crabtree effect
Detailed Academic Explanation:
Crabtree effect is the correct answer to “The production of ethanol rather than biomass by yeast cells at high concentration of glucose is known as”. This question is standard in competitive examination syllabi for Physiology And Metabolism.
💡Key Conceptual Anchor:Physiology And Metabolism
Question 3 of 40
★ PPSC
★ FPSC
★ PPSC
★ FPSC
Bacteriorhodopsin is a characteristic features of
Correct Answer: Option C — Halobacteria
Detailed Academic Explanation:
Halobacteria is the correct answer to “Bacteriorhodopsin is a characteristic features of”. This question is standard in competitive examination syllabi for Physiology And Metabolism.
💡Key Conceptual Anchor:Physiology And Metabolism
Question 4 of 40
★ PPSC
★ FPSC
★ PPSC
★ FPSC
Gas-Pak system is used for the study of
Correct Answer: Option A — Anaerobic microorganisms
Detailed Academic Explanation:
Anaerobic microorganisms is the correct answer to “Gas-Pak system is used for the study of”. This question is standard in competitive examination syllabi for Physiology And Metabolism.
💡Key Conceptual Anchor:Physiology And Metabolism
Question 5 of 40
★ PPSC
★ FPSC
★ PPSC
★ FPSC
Which one of the following is connecting link between Photosystem I and Photosystem II?
Correct Answer: Option D — Cytochrome b 6 f complex
Detailed Academic Explanation:
Cytochrome b 6 f complex is the correct answer to “Which one of the following is connecting link between Photosystem I and Photosystem II”. This question is standard in competitive examination syllabi for Physiology And Metabolism.
💡Key Conceptual Anchor:Physiology And Metabolism
Question 6 of 40
★ PPSC
★ FPSC
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★ FPSC
Photosynthesis is a/an
Correct Answer: Option B — Anabolic reaction
Detailed Academic Explanation:
Anabolic reaction is the correct answer to “Photosynthesis is a/an”. This question is standard in competitive examination syllabi for Physiology And Metabolism.
💡Key Conceptual Anchor:Physiology And Metabolism
Question 7 of 40
★ PPSC
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★ PPSC
★ FPSC
Plants take up water from the soil predominantly by the adoplastic and symplastic modes of transport. Which one of the following statements is true?
Correct Answer: Option D — Both apoplastic and symplastic transport are ATP-independent
Detailed Academic Explanation:
Both apoplastic and symplastic transport are ATP-independent is the correct answer to “Plants take up water from the soil predominantly by the adoplastic and symplastic modes of transport. Which one of the following statements is true”. This question is standard in competitive examination syllabi for Physiology And Metabolism.
💡Key Conceptual Anchor:Physiology And Metabolism
Question 8 of 40
★ PPSC
★ FPSC
★ PPSC
★ FPSC
Facultative anaerobes are
Correct Answer: Option D — Anaerobes which can respire anaerobically
Detailed Academic Explanation:
Anaerobes which can respire anaerobically is the correct answer to “Facultative anaerobes are”. This question is standard in competitive examination syllabi for Physiology And Metabolism.
💡Key Conceptual Anchor:Physiology And Metabolism
Question 9 of 40
★ PPSC
★ FPSC
★ PPSC
★ FPSC
The oxidative photosynthesis carbon cycle salvages
Correct Answer: Option D — CO2 carbon
Detailed Academic Explanation:
CO2 carbon is the correct answer to “The oxidative photosynthesis carbon cycle salvages”. This question is standard in competitive examination syllabi for Physiology And Metabolism.
💡Key Conceptual Anchor:Physiology And Metabolism
Question 10 of 40
★ PPSC
★ FPSC
★ PPSC
★ FPSC
Glycolysis is the name given to the pathway involving the conversion of
Correct Answer: Option D — Glucose to pyruvate or lactate
Detailed Academic Explanation:
Glucose to pyruvate or lactate is the correct answer to “Glycolysis is the name given to the pathway involving the conversion of”. This question is standard in competitive examination syllabi for Physiology And Metabolism.
💡Key Conceptual Anchor:Physiology And Metabolism
Question 11 of 40
★ PPSC
★ FPSC
★ PPSC
★ FPSC
ln a prokaryotic cell the respiratory enzymes are located in
Correct Answer: Option A — Plasma membrane
Detailed Academic Explanation:
Plasma membrane is the correct answer to “ln a prokaryotic cell the respiratory enzymes are located in”. This question is standard in competitive examination syllabi for Physiology And Metabolism.
💡Key Conceptual Anchor:Physiology And Metabolism
Question 12 of 40
★ PPSC
★ FPSC
★ PPSC
★ FPSC
Autotrophic organisms include
Correct Answer: Option A — Green plants and purple sulphur bacteria (PSB)
Detailed Academic Explanation:
Green plants and purple sulphur bacteria (PSB) is the correct answer to “Autotrophic organisms include”. This question is standard in competitive examination syllabi for Physiology And Metabolism.
💡Key Conceptual Anchor:Physiology And Metabolism
Question 13 of 40
★ PPSC
★ FPSC
★ PPSC
★ FPSC
Electron from Cyt-C are carried to molecular O 2 in
Correct Answer: Option B — Aerobic respiration
Detailed Academic Explanation:
Aerobic respiration is the correct answer to “Electron from Cyt-C are carried to molecular O 2 in”. This question is standard in competitive examination syllabi for Physiology And Metabolism.
💡Key Conceptual Anchor:Physiology And Metabolism
Question 14 of 40
★ PPSC
★ FPSC
★ PPSC
★ FPSC
The first step in photosynthesis is
Correct Answer: Option A — Ionization of water
Detailed Academic Explanation:
Ionization of water is the correct answer to “The first step in photosynthesis is”. This question is standard in competitive examination syllabi for Physiology And Metabolism.
💡Key Conceptual Anchor:Physiology And Metabolism
Question 15 of 40
★ PPSC
★ FPSC
★ PPSC
★ FPSC
The hydrogen donor in bacterial photosynthesis is usually
Correct Answer: Option C — Hydrogen sulphide
Detailed Academic Explanation:
Hydrogen sulphide is the correct answer to “The hydrogen donor in bacterial photosynthesis is usually”. This question is standard in competitive examination syllabi for Physiology And Metabolism.
💡Key Conceptual Anchor:Physiology And Metabolism
Question 16 of 40
★ PPSC
★ FPSC
★ PPSC
★ FPSC
When sunlight is on the chloroplast, pH is lowest in the
Correct Answer: Option C — Space enclosed by the thylakoid membrane
Detailed Academic Explanation:
Space enclosed by the thylakoid membrane is the correct answer to “When sunlight is on the chloroplast, pH is lowest in the”. This question is standard in competitive examination syllabi for Physiology And Metabolism.
💡Key Conceptual Anchor:Physiology And Metabolism
Question 17 of 40
★ PPSC
★ FPSC
★ PPSC
★ FPSC
The light reaction of photosynthesis does not include?
Correct Answer: Option B — Charge separation
Detailed Academic Explanation:
Charge separation is the correct answer to “The light reaction of photosynthesis does not include”. This question is standard in competitive examination syllabi for Physiology And Metabolism.
💡Key Conceptual Anchor:Physiology And Metabolism
Question 18 of 40
★ PPSC
★ FPSC
★ PPSC
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The core functional unit present-in NADH is
Correct Answer: Option B — Dihydro pyridine
Detailed Academic Explanation:
Dihydro pyridine is the correct answer to “The core functional unit present-in NADH is”. This question is standard in competitive examination syllabi for Physiology And Metabolism.
💡Key Conceptual Anchor:Physiology And Metabolism
Question 19 of 40
★ PPSC
★ FPSC
★ PPSC
★ FPSC
For metabolic engineering in plants having improved tolerance to osmotic stress, mannitol is overproduced because it
Correct Answer: Option A — Lowers the water potential in the plant cell
Detailed Academic Explanation:
Lowers the water potential in the plant cell is the correct answer to “For metabolic engineering in plants having improved tolerance to osmotic stress, mannitol is overproduced because it”. This question is standard in competitive examination syllabi for Physiology And Metabolism.
💡Key Conceptual Anchor:Physiology And Metabolism
Question 20 of 40
★ PPSC
★ FPSC
★ PPSC
★ FPSC
Enzyme of TCA cycle in prokaryotic cells are located in
Correct Answer: Option A — Plasma membrane
Detailed Academic Explanation:
Plasma membrane is the correct answer to “Enzyme of TCA cycle in prokaryotic cells are located in”. This question is standard in competitive examination syllabi for Physiology And Metabolism.
💡Key Conceptual Anchor:Physiology And Metabolism
Question 21 of 40
★ PPSC
★ FPSC
★ PPSC
★ FPSC
Light compensation point is the irradiance at which
Correct Answer: Option C — Net CO2 exchange is zero
Detailed Academic Explanation:
Net CO2 exchange is zero is the correct answer to “Light compensation point is the irradiance at which”. This question is standard in competitive examination syllabi for Physiology And Metabolism.
💡Key Conceptual Anchor:Physiology And Metabolism
Question 22 of 40
★ PPSC
★ FPSC
★ PPSC
★ FPSC
Organisms that ferment glucose may produce any of the following end products, except
Correct Answer: Option C — Alcohol
Detailed Academic Explanation:
Alcohol is the correct answer to “Organisms that ferment glucose may produce any of the following end products, except”. This question is standard in competitive examination syllabi for Physiology And Metabolism.
💡Key Conceptual Anchor:Physiology And Metabolism
Question 23 of 40
★ PPSC
★ FPSC
★ PPSC
★ FPSC
In photosynthesis, how many molecules of ATP and NADPH 2 are used?
Correct Answer: Option C — 18 ATP and 12 NADPH2
Detailed Academic Explanation:
18 ATP and 12 NADPH2 is the correct answer to “In photosynthesis, how many molecules of ATP and NADPH 2 are used”. This question is standard in competitive examination syllabi for Physiology And Metabolism.
💡Key Conceptual Anchor:Physiology And Metabolism
Question 24 of 40
★ PPSC
★ FPSC
★ PPSC
★ FPSC
The formation of glucose from non-arbohydrate source is known as
Correct Answer: Option B — Gluconeogenesis
Detailed Academic Explanation:
Gluconeogenesis is the correct answer to “The formation of glucose from non-arbohydrate source is known as”. This question is standard in competitive examination syllabi for Physiology And Metabolism.
💡Key Conceptual Anchor:Physiology And Metabolism
Question 25 of 40
★ PPSC
★ FPSC
★ PPSC
★ FPSC
Standard redox potential for substance ismeasured under standard condition and is expressed as
Correct Answer: Option B — Volt
Detailed Academic Explanation:
Volt is the correct answer to “Standard redox potential for substance ismeasured under standard condition and is expressed as”. This question is standard in competitive examination syllabi for Physiology And Metabolism.
💡Key Conceptual Anchor:Physiology And Metabolism
Question 26 of 40
★ PPSC
★ FPSC
★ PPSC
★ FPSC
During glycolysis, fructose-1, 6-diphosphate undergoes-to produce two C3-fragments
Correct Answer: Option A — Retroaldol reaction
Detailed Academic Explanation:
Retroaldol reaction is the correct answer to “During glycolysis, fructose-1, 6-diphosphate undergoes-to produce two C3-fragments”. This question is standard in competitive examination syllabi for Physiology And Metabolism.
💡Key Conceptual Anchor:Physiology And Metabolism
Question 27 of 40
★ PPSC
★ FPSC
★ PPSC
★ FPSC
The uncoupling agent of oxidative phosphorylation is
Correct Answer: Option C — Antimycin-A
Detailed Academic Explanation:
Antimycin-A is the correct answer to “The uncoupling agent of oxidative phosphorylation is”. This question is standard in competitive examination syllabi for Physiology And Metabolism.
💡Key Conceptual Anchor:Physiology And Metabolism
Question 28 of 40
★ PPSC
★ FPSC
★ PPSC
★ FPSC
In E. coli, the respiratory chain components are located in the
Correct Answer: Option B — Cytoplasmic membrane
Detailed Academic Explanation:
Cytoplasmic membrane is the correct answer to “In E. coli, the respiratory chain components are located in the”. This question is standard in competitive examination syllabi for Physiology And Metabolism.
💡Key Conceptual Anchor:Physiology And Metabolism
Question 29 of 40
★ PPSC
★ FPSC
★ PPSC
★ FPSC
The reduction phase of Calvin-Benson cycle in Arabidpsis is inhibited. This can be attributed to the inactivation of
Correct Answer: Option D — 3-phosphoglycerate kinase
Detailed Academic Explanation:
3-phosphoglycerate kinase is the correct answer to “The reduction phase of Calvin-Benson cycle in Arabidpsis is inhibited. This can be attributed to the inactivation of”. This question is standard in competitive examination syllabi for Physiology And Metabolism.
💡Key Conceptual Anchor:Physiology And Metabolism
Question 30 of 40
★ PPSC
★ FPSC
★ PPSC
★ FPSC
Pyruvic acid acts as
Correct Answer: Option D — Hydrogen accepter in fermentation and intermediate substrate in aerobic respiration
Detailed Academic Explanation:
Hydrogen accepter in fermentation and intermediate substrate in aerobic respiration is the correct answer to “Pyruvic acid acts as”. This question is standard in competitive examination syllabi for Physiology And Metabolism.
💡Key Conceptual Anchor:Physiology And Metabolism
Question 31 of 40
★ PPSC
★ FPSC
★ PPSC
★ FPSC
During mixed acid fermentation by E. coli, which one of the following is not produced?
Correct Answer: Option D — Citric acid
Detailed Academic Explanation:
Citric acid is the correct answer to “During mixed acid fermentation by E. coli, which one of the following is not produced”. This question is standard in competitive examination syllabi for Physiology And Metabolism.
💡Key Conceptual Anchor:Physiology And Metabolism
Question 32 of 40
★ PPSC
★ FPSC
★ PPSC
★ FPSC
The number of ATP produced when a molecule of glucose undergoes fermentation
Correct Answer: Option C — 2
Detailed Academic Explanation:
2 is the correct answer to “The number of ATP produced when a molecule of glucose undergoes fermentation”. This question is standard in competitive examination syllabi for Physiology And Metabolism.
💡Key Conceptual Anchor:Physiology And Metabolism
Question 33 of 40
★ PPSC
★ FPSC
★ PPSC
★ FPSC
Photosynthetic pigments is chloroplasts are embedded in the membrane of
Correct Answer: Option C — Thylakoids
Detailed Academic Explanation:
Thylakoids is the correct answer to “Photosynthetic pigments is chloroplasts are embedded in the membrane of”. This question is standard in competitive examination syllabi for Physiology And Metabolism.
💡Key Conceptual Anchor:Physiology And Metabolism
Question 34 of 40
★ PPSC
★ FPSC
★ PPSC
★ FPSC
Which of the following reactions is suggestive of oxidative decarboxylation?
Correct Answer: Option C — Conversion of α-ketoglutarate to succinyl co-A
Detailed Academic Explanation:
Conversion of α-ketoglutarate to succinyl co-A is the correct answer to “Which of the following reactions is suggestive of oxidative decarboxylation”. This question is standard in competitive examination syllabi for Physiology And Metabolism.
💡Key Conceptual Anchor:Physiology And Metabolism
Question 35 of 40
★ PPSC
★ FPSC
★ PPSC
★ FPSC
Photosynthesis is a process of converting
Correct Answer: Option C — Electromagnetic energy into chemical energy
Detailed Academic Explanation:
Electromagnetic energy into chemical energy is the correct answer to “Photosynthesis is a process of converting”. This question is standard in competitive examination syllabi for Physiology And Metabolism.
💡Key Conceptual Anchor:Physiology And Metabolism
Question 36 of 40
★ PPSC
★ FPSC
★ PPSC
★ FPSC
Anoxic earth become oxygenated due to oxygenic photosynthesis by
Correct Answer: Option D — Cyanobacteria
Detailed Academic Explanation:
Cyanobacteria is the correct answer to “Anoxic earth become oxygenated due to oxygenic photosynthesis by”. This question is standard in competitive examination syllabi for Physiology And Metabolism.
💡Key Conceptual Anchor:Physiology And Metabolism
Question 37 of 40
★ PPSC
★ FPSC
★ PPSC
★ FPSC
Phytochromes A and B maximally absorb light at wavelength range
Correct Answer: Option D — 600 - 750 nm
Detailed Academic Explanation:
600 - 750 nm is the correct answer to “Phytochromes A and B maximally absorb light at wavelength range”. This question is standard in competitive examination syllabi for Physiology And Metabolism.
💡Key Conceptual Anchor:Physiology And Metabolism
Question 38 of 40
★ PPSC
★ FPSC
★ PPSC
★ FPSC
Light absorbing antennas of the blue and red algae living at a depth of a metre or more in sea water are called as
Correct Answer: Option A — Phycobilisomes
Detailed Academic Explanation:
Phycobilisomes is the correct answer to “Light absorbing antennas of the blue and red algae living at a depth of a metre or more in sea water are called as”. This question is standard in competitive examination syllabi for Physiology And Metabolism.
💡Key Conceptual Anchor:Physiology And Metabolism
Question 39 of 40
★ PPSC
★ FPSC
★ PPSC
★ FPSC
Cytochrome are
Correct Answer: Option D — Iron-porphrin proteins
Detailed Academic Explanation:
Iron-porphrin proteins is the correct answer to “Cytochrome are”. This question is standard in competitive examination syllabi for Physiology And Metabolism.
💡Key Conceptual Anchor:Physiology And Metabolism
Question 40 of 40
★ PPSC
★ FPSC
★ PPSC
★ FPSC
A culture can grow independently in two carbon sources, glucose and hexadecane. Identify which one of the following statements is true?
Correct Answer: Option A — The biomass growth yields is more in hexadecane than in glucose
Detailed Academic Explanation:
The biomass growth yields is more in hexadecane than in glucose is the correct answer to “A culture can grow independently in two carbon sources, glucose and hexadecane. Identify which one of the following statements is true”. This question is standard in competitive examination syllabi for Physiology And Metabolism.
💡Key Conceptual Anchor:Physiology And Metabolism
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Analytical Tools In Biotechnology — Part 1
Master the next curriculum module with 40 exam-standard MCQs.
💡Examiner's Advisory for Biotechnology Engineering
In competitive commission exams (FPSC, PPSC, KPPSC, SPSC, CSS, PMS), questions are frequently phrased with distractor options designed to catch rote learners. Whenever you answer an MCQ, read the Detailed Academic Explanation and Conceptual Anchor to understand why the remaining options are incorrect.