FBISE Class 9th (SSC-l)
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FBISE Class 9th (SSC-l)
Answer: Each ribosome is formed of ribosomal RNA and proteins arranged in two subunits.
Answer: Ribosomes stud the surface of the rough ER, giving it a granular appearance.
Answer: Free ribosomes make proteins needed inside the cell, whereas ribosomes on rough ER make proteins for export.
Answer: The rough ER carries ribosomes that synthesize proteins for transport out of the cell.
Answer: The smooth ER lacks ribosomes and is involved in lipid and steroid synthesis.
Answer: The ER network transports materials inside the cell and connects different organelles.
Answer: Ribosomes attached to the outer surface give the rough ER its granular look.
Answer: The smooth ER has no ribosomes, so it does not synthesize proteins.
Answer: The ER extends from the nuclear membrane to the cell membrane, forming a connected network.
Answer: The Golgi apparatus modifies, packages, and secretes proteins and other materials.
Answer: The Golgi apparatus consists of stacks of flattened sacs (cisternae) with vesicles.
Answer: In plant cells the Golgi apparatus is called a dictyosome.
Answer: Newly made proteins leave the ER in vesicles that fuse with the Golgi apparatus.
Answer: The Golgi apparatus buds off vesicles that carry secretions out of the cell.
Answer: Lysosomes contain hydrolytic enzymes that break down proteins, carbohydrates, lipids, and nucleic acids.
Answer: When lysosomes rupture, their digestive enzymes destroy the cell's own contents, hence the name.
Answer: Digestive enzymes are packaged by the Golgi apparatus into lysosomes.
Answer: Vacuoles are membrane-bound sacs that store water, salts, sugars, and waste products.
Answer: Mature plant cells have one large central vacuole occupying much of the cell volume.
Answer: The vacuolar membrane is called the tonoplast.