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.
RNA's are involved in decoding the genes within cell's DNA. Three major types of RNA are-
1.mRNA
2.tRNA
3. rRNA
All three are needed to synthesize protein in cell.
Ribosomes are the site, where protein synthesis takes place in a cell. Ribosomes are composed of rRNA and protein. Each ribosome is made up of two subunits.
P site of ribosome is one of the binding site at which tRNA binds to ribosomes. The other sites are- A site and E sites.
P-site of ribosomes is important because, initiation of protein synthesis begins when start codon is recognized by intitator tRNA in the P-site and newly synthesized polypeptide is released on reaching stop codon, when peptidyl tRNA located in P-site is cleaved.
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