Identify the correct statement about introns (also called intervening sequences, or intragenic sequences) in the protein-coding genes of prokaryotic and eukaryotic cells. introns are always absent in some prokaryotic genes, and also absent in all eukaryotic genes introns are always absent in all prokaryotic genes, but present in some eukaryotic genes introns are rarely present in prokaryotic genes, but frequently present in eukaryotic genes introns are rarely present in most prokaryotic genes, but absent in all eukaryotic genes introns are always present in all prokaryotic genes, but frequently absent in eukaryotic genes
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.
Identify the correct statement about introns (also called intervening sequences, or intragenic sequences) in the protein-coding genes of prokaryotic and eukaryotic cells.
- introns are always absent in some prokaryotic genes, and also absent in all eukaryotic genes
- introns are always absent in all prokaryotic genes, but present in some eukaryotic genes
- introns are rarely present in prokaryotic genes, but frequently present in eukaryotic genes
- introns are rarely present in most prokaryotic genes, but absent in all eukaryotic genes
- introns are always present in all prokaryotic genes, but frequently absent in eukaryotic genes
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