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.
Evaluate the following statements. Which one statement is false?
| a. |
The active form of prokaryotic RNA polymerase is a haloenzyme. |
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| b. |
Anti-codons are a |
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| c. |
During translation, the terminal carboxyl group of an existing peptide will form a peptide bond with the next amino acid in sequence. |
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| d. |
The amino acid R-group is necessary for the formation of tertiary and quaternary structures through covalent bonds, ionic bonds, hydrogen bonds, and hydrophobic interactions. |
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| e. |
The sigma factors of prokaryotes are responsible for binding a DNA promotor sequence so translation can begin. |
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| f. |
The terminal carboxyl and terminal amino groups of amino acids within a peptide are necessary for the formation of secondary structures through hydrogen bonds. |
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| g. |
A restriction enzyme can target supercoiled, relaxed, or linearized plasmid DNA. |
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| h. |
DNases will specifically target and degrade DNA. |
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