Class 8 Practice – Level 3 – Set 1 – Cell Structure and Functions Leave a Comment / By anushka kumari / October 24, 2024 Class 8 Practice – Level 3 – Set 1 – Cell Structure and Functions Total questions: 15 1. How do prokaryotic and eukaryotic cells differ in terms of genetic material? Prokaryotic cells have circular DNA, while eukaryotic cells have linear DNA. Prokaryotic cells have DNA inside a nucleus, while eukaryotic cells have free DNA. Prokaryotic cells have no DNA, while eukaryotic cells have DNA. Prokaryotic cells have RNA instead of DNA, while eukaryotic cells have DNA. None 2. The term "endosymbiotic theory" explains the origin of which organelles? Mitochondria and chloroplasts Ribosomes and Golgi apparatus Nucleus and endoplasmic reticulum Lysosomes and peroxisomes None 3. What distinguishes smooth endoplasmic reticulum (SER) from rough endoplasmic reticulum (RER)? SER has ribosomes, while RER does not. SER synthesizes proteins, while RER synthesizes lipids. RER has ribosomes on its surface, while SER does not. RER detoxifies drugs, while SER does not. None 4. The difference between active transport and passive transport in cells is primarily related to: The concentration gradient of the substances. The type of membrane involved. The type of energy used. The size of the molecules being transported. None 5. Which of the following structures is responsible for the detoxification of harmful metabolic by-products in the liver? Golgi apparatus Smooth endoplasmic reticulum Lysosomes Mitochondria None 6. What role does the nucleolus play in a cell? It produces ATP. It synthesizes ribosomal RNA (rRNA). It breaks down waste materials. It stores genetic information. None 7. Which of the following statements about lysosomes is false? They contain hydrolytic enzymes for digestion. They can fuse with vacuoles to digest their contents. They are involved in energy production. They help recycle cellular components. None 8. Which cellular process is primarily responsible for the movement of water across a membrane? Active transport Diffusion Osmosis Facilitated diffusion None 9. In which phase of the cell cycle does the cell prepare for mitosis? G1 phase S phase G2 phase M phase None 10. Which of the following is NOT a function of the cytoskeleton? Providing structural support Facilitating cell movement Storing genetic information Organizing organelles None 11. The presence of ribosomes on the rough endoplasmic reticulum is significant because: It allows for the detoxification of drugs. It enables the synthesis of proteins for export. It facilitates lipid synthesis. It aids in energy production. None 12. Which organelle is primarily involved in the synthesis of ATP during cellular respiration? Ribosomes Nucleus Mitochondria Golgi apparatus None 13. What is the main purpose of cellular respiration? To synthesize proteins To break down glucose for energy To produce nucleic acids To replicate DNA None 14. The main function of the chloroplast is to: Produce energy through cellular respiration. Convert sunlight into chemical energy. Synthesize proteins. Store waste products. None 15. What is the significance of the semi-permeable nature of the cell membrane? It allows all substances to enter and exit freely. It prevents all substances from entering the cell. It helps maintain homeostasis by regulating the internal environment. It provides structural support to the cell. None 1 out of 15 Time's up
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