Both lysosomes and vacuoles are endomembrane structures, yet they differ in terms of their functions. Comment.
Lysosomes are membrane-bound vesicular structures holding a variety of enzymes such as lipases, proteases and amylases. The purpose of lysosomes is to digest worn out cells. They are involved in the intracellular digestion of foreign food particles and microbes. Sometimes, they also act as suicidal bags. They are involved in the self digestion of cells. They are a kind of waste disposal systems of a cell. On the other hand, vacuoles are storage sacs found in cells. They might store the waste products of cells. In unicellular organisms, the food vacuole contains the consumed food particles. It also plays a role in expelling excess water and some wastes from the cell.
Name two cell-organelles that are double membrane bound. What are the characteristics of these two organelles? State their functions and draw labelled diagrams of both.
Multicellular organisms have division of labour. Explain.
What is a centromere? How does the position of centromere form the basis of classification of chromosomes. Support your answer with a diagram showing the position of centromere on different types of chromosomes.
Cell is the basic unit of life. Discuss in brief.
What is a mesosome in a prokaryotic cell? Mention the functions that it performs.
Which of the following is correct:
(a) Cells of all living organisms have a nucleus.
(b) Both animal and plant cells have a well defined cell wall.
(c) In prokaryotes, there are no membrane bound organelles.
(d) Cells are formed de novo from abiotic materials.
Describe the structure of the following with the help of labelled diagrams.
(i) Nucleus
(ii) Centrosome
What are nuclear pores? State their function.
How do neutral solutes move across the plasma membrane? Can the polar molecules also move across it in the same way? If not, then how are these transported across the membrane?
What are the characteristics of prokaryotic cells?
Define a taxon. Give some examples of taxa at different hierarchical levels.
Bile juice contains no digestive enzymes, yet it is important for digestion. Why?
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nice answer but very long
Nice answer but give more better
Very big
Very long answers
Not given about vacuole