Read the following text and answer the questions mentioned below
Endocytosis (endo= internal, cytosis= transport mechanism) is a general term for the various
types of active transport that move particles into a cell by enclosing them in a vesicle made
out of plasma membrane
Phagocytosis (literally, “cell eating”) is a form of endocytosis in which large particles, such as
cells or cellular debris, are transported into the cell.
Pinocytosis (literally, “cell drinking”) is a form of endocytosis in which a cell takes in small
amounts of extracellular fluid.
Receptor-mediated endocytosis is a form of endocytosis in which receptor proteins on the cell
surface are used to capture a specific target molecule i.e., the molecules that the cells need.
However, sometimes less friendly particles may gain entry by the same route. Flu viruses,
diphtheria, and cholera toxin all use receptor-mediated endocytosis pathways to gain entry
into cells
1: Active transport is the transport in which energy of the cell is used. On the other hand, in
passive transport no energy is used. Then how does passive transport actually take place?
2: You all must have read about cell organelle which carries out the process of phagocytosis.
Give reason why it carries this process.
3: In the above text the word “Specific Target molecules” has been used. These target
molecules are represented by a star in the figure shown above, which are recognized by the
receptors on the surface of plasma membrane. If you are a non-friendly pathogen and want to
seek entry into the cell, what would be your strategy?
Answers
Answer:
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