Q4.3. The DNA in a cell is intact and functional, but something in the cell's DNA replication machinery is broken. What is the consequence of this breakage for the cell? The cell would not be able to undergo cell division as it normally would. The cell would be unable to make proteins based on the information in DNA. The cell would not form a nucleus, because the nucleus contains DNA. The cell would become a cancer cell, dividing in an uncontrolled manner.
Structure and Composition of Cell Membrane
Despite differences in structure and function, all living cells in multicellular organisms are surrounded by a cell membrane. Just like the outer layer of the skin separates the body from its environment similarly, the cell membrane, also known as 'plasma membrane,' separates the inner content from its exterior environment.
Cell Membrane
The cell membrane is known by different names like plasma membrane or cytoplasmic membrane, or biological membrane. The term "cell membrane" was first introduced by C. Nageli and C. Cramer in the year 1855. Later on, in 1931, the term "plasmalemma" for cell membrane was given by J. Plowe. The cell membrane separates the cell's internal environment from the extracellular space. This separation allows the protection of cells from their environment.
Prokaryotes vs Eukaryotes
The cell is defined as the basic structural and functional unit of life. The cell membrane bounds it. It is capable of independent existence.
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