7-1 If there is 24% guanine in a DNA molecule, what percent is cytosine? Adenine? Thymine? Uracil? 7-2 In a single strand of DNA, what fraction of the nucleotides in a molecule are cytosine and thymine? Cytosine and adenine? Adenine and thymine? Adenine and guanine? 7-3 Using ¹4N isotope medium for DNA replication instead of ¹5N, what would be observed if DNA replication were conservative in one cycle of replication/in three cycles? How about dispersive replication in one cycle, in three cycles?
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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