Class 11 Biology - Chapter Cell: The Unit of Life NCERT Solutions | What is a mesosome in a prokaryotic cell
What is a mesosome in a prokaryotic cell? Mention the functions that it performs.
Mesosome is a convoluted membranous structure formed in a prokaryotic cell by the invagination of the plasma membrane. Its functions are as follows:
(1) These extensions help in the synthesis of the cell wall and replication of DNA. They also help in the equal distribution of chromosomes into the daughter cells.
(2) It also increases the surface area of the plasma membrane to carry out various enzymatic activities.
(3) It helps in secretion processes as well as in bacterial respiration.
More Questions From Class 11 Biology - Chapter Cell: The Unit of Life
- Q:-
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.
- Q:-
Multicellular organisms have division of labour. Explain.
- Q:-
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.
- Q:-
Cell is the basic unit of life. Discuss in brief.
- Q:-
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. - Q:-
Both lysosomes and vacuoles are endomembrane structures, yet they differ in terms of their functions. Comment.
- Q:-
Describe the structure of the following with the help of labelled diagrams.
(i) Nucleus
(ii) Centrosome - Q:-
What are nuclear pores? State their function.
- Q:-
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?
- Q:-
What are the characteristics of prokaryotic cells?
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