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Practice each question, then open the answer or worked solution.
What is the significance of vacuole in a plant cell?
A vacuole is a membrane-bound space found in the cytoplasm. It is found in both plant and animal cells but it is much larger in plants (occupies 90% of the space in plant cells). Help is in the storage, waste disposal, cell elongation and cell protection.
What does ‘S’ refer in the 70S & an 80S ribosome?
The ‘S’ refers to Svedberg’s unit or sedimentation coefficient. It is indirectly a measure of density and size.
Mention a single membrane-bound organelle which is rich in hydrolytic enzymes.
Lysosomes are the single membrane-bound organelle which is rich in hydrolytic enzymes.
What are gas vacuoles? State their functions.
Gas vacuoles are aggregates of hollow cylindrical structures called gas vesicles. They store metabolic gases and take part in buoyancy.
What is the function of a polysome?
The function of a polysome is to translate an mRNA into proteins.
What is the feature of a metacentric chromosome?
The metacentric chromosome has middle centromere forming two equal arms of the chromosome.
What is referred to as satellite chromosome?
A few chromosomes have non-staining secondary constrictions at a constant location. This gives the appearance of a small fragment called the satellite. Such chromosomes are called satellite chromosomes.