Class 9 Practice Level 2 – Set 2 – The Fundamental Unit of Life Leave a Comment / By Gulam Hamza / August 26, 2024 Class 9 Practice Level 2 – Set 2 – The Fundamental Unit of Life Total questions: 25 1. Which protein is crucial for regulating the cell cycle? Topic: Cell Cycle Regulation Actin Myosin Cyclin Tubulin None 2. Chromatin is composed of: Topic: Genetic Material DNA and histone proteins RNA and lipids Proteins and carbohydrates Nucleotides and ribosomes None 3. Which type of transport does not require energy? Topic: Membrane Transport Active transport Facilitated diffusion Endocytosis Exocytosis None 4. Gap junctions are involved in: Topic: Cell Communication DNA replication Cell-cell communication Protein synthesis Cellular respiration None 5. Receptors on the cell membrane are primarily involved in: Topic: Signal Transduction Protein synthesis Signal transduction DNA replication Lipid synthesis None 6. The gradual loss of a cell's ability to divide and function is known as: Topic: Cellular Aging Apoptosis Necrosis Senescence Differentiation None 7. Peroxisomes are involved in: Topic: Peroxisomes Protein synthesis DNA replication Detoxification of harmful substances Photosynthesis None 8. Cytoplasmic streaming is observed in: Topic: Cytoplasmic Streaming Nucleus Mitochondria Chloroplast Cytoplasm None 9. The interaction between lysosomes and endosomes is essential for: Topic: Organelle Interaction Photosynthesis Protein modification Breakdown of ingested material Lipid synthesis None 10. The genetic information within mitochondria is inherited from: Topic: Genetic Information Both parents Only the father Only the mother Randomly None 11. The pigment chlorophyll is located in the: Topic: Photosynthetic Organelles Mitochondria Chloroplast Nucleus Golgi Apparatus None 12. Eukaryotic cells are characterized by the presence of: Topic: Eukaryotic Cells Nucleus Nucleoid Plasmids Capsule None 13. Muscle cells are specialized for: Topic: Cell Specialization Photosynthesis Contraction Secretion Signal transduction None 14. The transport of proteins from the ER to the Golgi apparatus is facilitated by: Topic: Intracellular Transport Ribosomes Vesicles Microtubules Actin filaments None 15. The technique used to insert a gene into a plasmid is called: Topic: Genetic Engineering Cloning Transformation Transcription Replication None 16. Which factor limits the size of cells? Topic: Cell Size and Surface Area Number of mitochondria Surface area-to-volume ratio Amount of DNA Number of ribosomes None 17. If the concentration of a solute inside a cell is 0.2 M and outside the cell is 0.5 M, which direction will the solute likely move, and by what process? Topic: Diffusion Into the cell by active transport Out of the cell by diffusion Into the cell by osmosis Out of the cell by facilitated diffusion None 18. A cell with an internal salt concentration of 1% is placed in a 10% salt solution. What will happen to the cell? Topic: Osmosis The cell will swell The cell will shrink The cell will remain the same size The cell will burst None 19. Calculate the surface area-to-volume ratio of a cubic cell with a side length of 2 µm. Topic: Numerical - Surface Area-to-Volume Ratio 1.5 µm²/µm³ 2 µm²/µm³ 3 µm²/µm³ 4 µm²/µm³ None 20. A cell is placed in a solution containing 5 g of solute in 100 mL of water. Calculate the concentration of the solution in g/mL. Topic: Numerical - Concentration Calculation 0.05 g/mL 0.1 g/mL 0.5 g/mL 1 g/mL None 21. Which of the following statements about active transport is true? Topic: Active Transport It requires energy in the form of ATP. It moves substances down their concentration gradient. It occurs through diffusion. It does not involve membrane proteins. None 22. Which of the following organelles is involved in modifying, sorting, and packaging proteins for secretion? Topic: Organelles Mitochondria Golgi apparatus Lysosome Nucleus None 23. If a spherical cell has a radius of 3 µm, what is the volume of the cell? (Use the formula for the volume of a sphere: V = 4/3πr³) Topic: Numerical - Volume of a Cell 36 µm³ 113.1 µm³ 1134 µm³ 904.3 µm³ None 24. Which of the following best describes the cytoplasm? Topic: Cytoplasm A rigid structure providing support A jelly-like substance that contains organelles A storage area for waste products A site for DNA replication None 25. In which organelle does the Krebs cycle take place? Topic: Cellular Respiration Nucleus Chloroplast Mitochondria Ribosome None 1 out of 25 Time's up
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