FBISE Class 9th (SSC-l)
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FBISE Class 9th (SSC-l)
Answer: The plasma membrane is also called the cell membrane or plasmalemma.
Answer: Cytoplasm is the semi-fluid material filling the cell between the plasma membrane and the nucleus.
Answer: The cytosol is the fluid part of the cytoplasm in which organelles are suspended.
Answer: Cytosol is the water-based fluid containing dissolved salts, sugars, and other small molecules.
Answer: The cytoplasm is the site of most metabolic activities of the cell.
Answer: The nucleus directs and controls the activities of the cell and holds genetic material.
Answer: The nuclear envelope (nuclear membrane) separates the nucleus from the cytoplasm.
Answer: The nucleus is enclosed by two membranes forming the nuclear envelope with pores in between.
Answer: The nucleolus produces RNA and is involved in ribosome formation.
Answer: Chromatin consists of DNA coiled around proteins and condenses into chromosomes during cell division.
Answer: Chromatin threads condense and coil into distinct chromosomes when the cell divides.
Answer: Nucleopores permit the movement of molecules such as RNA and proteins between nucleus and cytoplasm.
Answer: Mammalian red blood cells are enucleated, lacking a nucleus to make room for hemoglobin.
Answer: Mitochondria are the site of aerobic cellular respiration where energy is released.
Answer: The inner mitochondrial membrane is folded into cristae, which increase the surface area for respiration.
Answer: A mitochondrion has an outer and an inner membrane enclosing the matrix.
Answer: Mitochondria possess their own DNA and ribosomes, supporting their semi-autonomous nature.
Answer: Mitochondria generate ATP during cellular respiration.
Answer: The matrix is the fluid filling the inner space of the mitochondrion.
Answer: Ribosomes read mRNA to build proteins, so they are the sites of protein synthesis.