Cell organelles structure and function-nucleus mitochondria chloroplast endoplasmic reticulum Golgi apparatus lysosome ribosome - Online Test

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1. Which organelle is often referred to as the 'powerhouse' of the cell due to its role in ATP production?

A) Nucleus B) Mitochondrion C) Chloroplast D) Ribosome

2. The double membrane surrounding the nucleus is called the:

A) Plasma membrane B) Endoplasmic reticulum C) Nuclear envelope D) Golgi membrane

3. What is the primary function of chloroplasts in plant cells?

A) Protein synthesis B) Cellular respiration C) Photosynthesis D) Waste disposal

4. Which organelle is responsible for synthesizing proteins?

A) Lysosome B) Golgi apparatus C) Ribosome D) Mitochondrion

5. The network of interconnected membranes involved in protein and lipid synthesis is known as the:

A) Golgi apparatus B) Lysosome C) Nucleus D) Endoplasmic reticulum

6. Which organelle contains hydrolytic enzymes and is involved in intracellular digestion?

A) Mitochondrion B) Chloroplast C) Lysosome D) Ribosome

7. The genetic material of eukaryotic cells is primarily located within which organelle?

A) Endoplasmic reticulum B) Golgi apparatus C) Nucleus D) Mitochondrion

8. The stacks of flattened sacs within chloroplasts where light-dependent reactions occur are called:

A) Stroma B) Grana C) Thylakoids D) Outer membrane

9. Which type of endoplasmic reticulum is studded with ribosomes and involved in protein synthesis and modification?

A) Smooth ER B) Rough ER C) Nuclear ER D) Golgi ER

10. The Golgi apparatus is primarily involved in:

A) Energy production B) DNA replication C) Modifying, sorting, and packaging proteins and lipids D) Breaking down cellular waste

11. Ribosomes are composed of:

A) DNA and proteins B) RNA and lipids C) RNA and proteins D) DNA and lipids

12. The fluid-filled space within a chloroplast, surrounding the grana, is known as the:

A) Thylakoid lumen B) Intermembrane space C) Stroma D) Cytoplasm

13. Mitochondria possess their own circular DNA and ribosomes, suggesting their origin through:

A) Endosymbiosis B) Autogenesis C) De novo synthesis D) Cytokinesis

14. The nuclear pores are responsible for regulating the passage of molecules between the nucleus and the:

A) Mitochondrion B) Golgi apparatus C) Cytoplasm D) Endoplasmic reticulum

15. Which organelle is responsible for detoxification of drugs and poisons in liver cells?

A) Rough ER B) Smooth ER C) Lysosome D) Golgi apparatus

16. Lysosomes are formed from:

A) Mitochondria B) Nucleus C) Endoplasmic reticulum and Golgi apparatus D) Ribosomes

17. The inner membrane of the mitochondrion is highly folded into structures called:

A) Cristae B) Thylakoids C) Grana D) Matrix

18. In plant cells, the large central vacuole plays a role in maintaining turgor pressure and storing water, which is related to the function of which other organelle?

A) Lysosome B) Chloroplast C) Golgi apparatus D) Nucleus

19. The process of protein synthesis on ribosomes is called:

A) Transcription B) Replication C) Translation D) Transduction

20. Which component of the nucleus contains the nucleolus, where ribosomal RNA synthesis occurs?

A) Chromatin B) Nucleoplasm C) Nuclear envelope D) Nucleolus

21. The smooth endoplasmic reticulum is involved in the synthesis of:

A) Proteins B) Lipids and steroids C) Nucleic acids D) Cellulose

22. Which organelle is responsible for the breakdown of old or damaged organelles and cellular debris?

A) Golgi apparatus B) Lysosome C) Mitochondrion D) Chloroplast

23. The matrix of the mitochondrion contains enzymes for which crucial metabolic pathway?

A) Glycolysis B) Krebs cycle (Citric Acid Cycle) C) Electron transport chain D) Photosynthesis

24. The thylakoid membranes within chloroplasts are the site of which set of reactions in photosynthesis?

A) Calvin cycle B) Light-dependent reactions C) Carbon fixation D) Stroma reactions

25. Which of the following is NOT a function of the nucleus?

A) Storing genetic information B) Controlling cell growth and reproduction C) Synthesizing ATP D) Regulating gene expression

26. The Golgi apparatus receives vesicles containing proteins and lipids from the:

A) Nucleus B) Mitochondrion C) Endoplasmic reticulum D) Lysosome

27. What is the term for the small, granular structures responsible for protein synthesis, found free in the cytoplasm or attached to the ER?

A) Peroxisomes B) Lysosomes C) Ribosomes D) Vacuoles

28. The outer membrane of the nucleus is continuous with the:

A) Plasma membrane B) Golgi apparatus C) Endoplasmic reticulum D) Mitochondrial membrane

29. Chloroplasts are unique to:

A) Animal cells B) Plant cells and some protists C) Bacterial cells D) Fungal cells

30. Mitochondria are found in:

A) Plant cells only B) Animal cells only C) Eukaryotic cells D) Prokaryotic cells only

31. Which organelle plays a key role in the synthesis of phospholipids and cholesterol?

A) Rough ER B) Lysosome C) Smooth ER D) Golgi apparatus

32. The process by which lysosomes fuse with food vacuoles to digest their contents is called:

A) Autophagy B) Phagocytosis C) Endocytosis D) Phagolysosome formation

33. The function of the nucleolus is primarily to synthesize:

A) Messenger RNA (mRNA) B) Transfer RNA (tRNA) C) Ribosomal RNA (rRNA) D) DNA

34. Which organelle contains the enzymes necessary for the Calvin cycle (light-independent reactions) of photosynthesis?

A) Thylakoid membrane B) Stroma C) Outer membrane D) Inner membrane

35. The inner membrane of the nucleus is supported by a network of protein filaments called the:

A) Cytoskeleton B) Nuclear lamina C) Microtubules D) Intermediate filaments

36. Which organelle is involved in the synthesis of steroid hormones?

A) Rough ER B) Lysosome C) Smooth ER D) Golgi apparatus

37. The 'cis' face of the Golgi apparatus is typically oriented towards the:

A) Plasma membrane B) Nucleus C) Endoplasmic reticulum D) Cytoplasm

38. Which of the following is a characteristic feature of ribosomes?

A) They are membrane-bound organelles. B) They are responsible for cellular respiration. C) They are composed of rRNA and protein. D) They contain the cell's genetic material.

39. The site of oxidative phosphorylation, generating the majority of ATP in aerobic respiration, is the:

A) Mitochondrial matrix B) Mitochondrial intermembrane space C) Inner mitochondrial membrane D) Outer mitochondrial membrane

40. Which organelle is crucial for the breakdown of fatty acids and the detoxification of harmful substances like hydrogen peroxide?

A) Lysosome B) Peroxisome C) Golgi apparatus D) Vacuole

41. The chromosomes within the nucleus are composed of:

A) RNA and proteins B) DNA and lipids C) DNA and proteins D) RNA and lipids

42. The 'trans' face of the Golgi apparatus is typically oriented towards the:

A) Endoplasmic reticulum B) Nucleus C) Plasma membrane D) Mitochondrion

43. What are the two main components of the endoplasmic reticulum?

A) Cisternae and tubules B) Outer membrane and inner membrane C) Rough ER and smooth ER D) Stroma and grana

44. Which organelle is involved in the formation of vesicles that transport materials within the cell?

A) Nucleus B) Mitochondrion C) Golgi apparatus D) Ribosome

45. The primary function of the nuclear envelope is to:

A) Synthesize ATP B) Separate the nuclear contents from the cytoplasm C) Break down cellular waste D) Store genetic information

46. In chloroplasts, the light-independent reactions (Calvin cycle) occur in the:

A) Thylakoid membrane B) Outer membrane C) Stroma D) Inner membrane

47. Which organelle's membrane contains enzymes for the synthesis of lipids and detoxification?

A) Rough ER B) Lysosome C) Smooth ER D) Golgi apparatus

48. The structure of a ribosome includes:

A) A single membrane B) Two subunits made of rRNA and protein C) A double membrane D) Hydrolytic enzymes

49. Which organelle is responsible for the synthesis of ATP during cellular respiration?

A) Chloroplast B) Nucleus C) Mitochondrion D) Ribosome

50. The process of breaking down substances using enzymes within a lysosome is called:

A) Synthesis B) Digestion C) Respiration D) Fermentation

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