Biology Bioenergetics, Bioenergetics MCQs Online Test
The field of energy flow and transformation research in living organisms is known as Biology Bioenergetics. Through this study scientists understand biological cell operations that require energy for survival along with energy acquisition mechanisms. The study of biochemistry heavily depends on this material because it includes ATP synthesis along with metabolic pathways together with cellular respiration. ECAT and MDCAT candidates need to grasp bioenergetics because biological sciences depend heavily on this concept.
Importance of Bioenergetics in Biology
The existence of life depends on energy to survive. The primary food source of living organisms works as their main energy supply while biochemical pathways convert it into different useful energy forms. This process involves:
- Photosynthesis: Conversion of light energy into chemical energy in plants.
- Cellular Respiration: The process of Cellular Respiration breaks down glucose for ATP production across both animal and plant species.
- Metabolic Pathways: Series of chemical reactions that sustain life.
Key Concepts in Bioenergetics
1. ATP: The Energy Currency
Adenosine triphosphate (ATP) is the primary energy carrier in biological systems. It stores and releases energy required for various cellular functions.
- ATP is synthesized in mitochondria through oxidative phosphorylation.
- It is hydrolyzed to release energy needed for cellular activities.
2. Photosynthesis and Its Role in Energy Production
Plants convert light energy into chemical energy through photosynthesis, occurring in the chloroplasts.
- Light Reactions: Capture solar energy and produce ATP and NADPH.
- Dark Reactions (Calvin Cycle): Use ATP and NADPH to synthesize glucose.
3. Cellular Respiration and ATP Synthesis
Cellular respiration occurs in three main stages:
- Glycolysis converts glucose into the compound pyruvate within the cellular fluid (cytoplasm).
- In mitochondria, pyruvate continues its oxidation process through the Krebs Cycle.
- ATP production occurs through oxidative phosphorylation as the Electron Transport Chain (ETC) operates.
4. Metabolism and Energy Flow
The metabolic processes include two operations: catabolism for molecule breakdown that generates energy and anabolism for building complex structures through energy usage. The cellular function remains stable because enzymes regulate these metabolism processes.
Biology Bioenergetics MCQs for ECAT Preparation
1. The pigments found in the thylakoid membranes are ?
- Xanthophyll
- Chlorophyll
- All of thesecorrect
- Carotenoids
2. The principles of energy transformations in living systems is called ?
- Biochemistry
- Bioenergeticscorrect
- Biophysics
- THermodynamics
3. What is not correct of photosynthesis ?
- None of these
- It uses oxygencorrect
- It uses water
- It occurs during day time
4. Thylakoid membranes are involved in ATP formation by ?
- Osmosis
- Oxidative phosphorylation
- Chemosynthesis
- Chemiosmosiscorrect
5. The color of chlorophyll b is ?
- Orange red
- Blue and green
- Yellow and greencorrect
- Orange green
6. The presence of free oxygen made possible the evolution of ?
- Man
- Respirationcorrect
- Dark reactions
- Photosynthesis
7. The interior of thylakoid apace is also called a ?
- Enteron
- Lumencorrect
- Coelom
- Cavity
8. Spectrophotometer is used to measure ?
- Absorption of different wavelengthscorrect
- Absorption of blue light
- Absorption of carbon
- Absorption of water
9. Chlorophyll contains magnesium in which part ?
- Pyrrole ring
- Hacme portion
- Phytol tail
- Porphyrincorrect
10. Which equation of photosynthesis is correct one ?
A=6CO 2 + 12H 2 O + Light→C 6 H 12 O 6 + 6O 2 + 6H 2 O
B=6CO 2 + 6H 2 O + Light→C 6 H 12 O 6 + 6O 2
C=Both of these
- B
- A
- Ccorrect
11. Thylakoid sacs are stacked in columns called ?
- Lamellae
- Piles
- Stroma
- Granacorrect
12. Which wavelengths are least absorbed by chlorophyll ?
- Orange and indigo
- Blue and red
- Violet and yellow
- Green and yellowcorrect
Question was not answered13. Loght can work in photosynthesis only if it is ?
- Absorbedcorrect
- Reflected
- Transmitted
- Refracted
14. Which statement about chlorophyll is not true ?
- It contains porphyring ring
- It contains phytol tail
- It contains magnesium
- It contains terminal carbonyl groupcorrect
15. The number of chloroplastis in a square millimeter of leaf surface is about ?
- 5 lac
- Half a million
- 0.5 million
- All of abovecorrect
16. Which part of plant captures light energy ?
- Stomata
- Mesophyll cell
- Choroplastcorrect
- Plastids
17. Oxygen released during photosynthesis comes from ?
- Haydrogencorrect
- Carbian dia axcide
- Atmosphere
- soil
18. Which statement about photosynthesis is not correct ?
A=CO 2 and H 2 O are used
B=Take place in light and dark
C=Light energy absorbed by chlorophy
D=Occurs in almost all the green parts of Plant
- A
- C
- Bcorrect
- D
19. Process of photosynthesis is almost exactly opposite to ?
- Aerobic respirationcorrect
- Combustion
- Fermentation
- Anaerobic repiration
20. The products of photosynthetic light reaction are ?
- ATP and NADH
- ATP and FADPH
- ATP and NAD
- ATP and NADPHcorrect
21. What is unrelated to light reactions ?
- ATP is produced in it
- It can occur in darkcorrect
- NADPH is produced in it
- It can occur in light only
22. Which wavelengths are mainly absorbed by chlorophyll ?
- Violet and orange
- Red and indigo
- Green and blue
- Violet blue and orange redcorrect
23. The number of chlorroplasts in each mesophyll cell ranges from ?
- 20-60
- 60-80
- 20-100correct
- 20-40
24. Magnesium is an important nutrient ion in green plants as it is an essential component of ?
- Protein
- Chlorophyllcorrect
- Cell sap
- Glucose
25. Chloroplast encloses a dense fluid filled region called ?
- Matrix
- Stromacorrect
- Cytosol
- Grana
Conclusion
Biology Bioenergetics stands as a vital concept in biology because it describes all processes regarding energy creation and storage and organismal energy use. ECAT candidates need to study ATP synthesis along with metabolic pathways and energy transformation mechanisms properly. Your mastery and exam readiness will benefit from practicing MCQs concerning this subject area.For more MCQs and study resources, visit Nokryan.com and enhance your learning experience!