Q. Because of the high energy demands related to swimming at depth, belugas possess very large specialized mitochondria. Given your knowledge of evolution and the theory of endosymbiosis, which hypothesis best explains the presence of these special mitochondria in the muscle cells of these whales? A. the beluga's mitochondria were originally chloroplasts B. the lineage leading to belugas evolved specialized mitochondria after the original endosymbiotic event C. whale muscle cells engulfed the special mitochondria 100,000 years ago during the evolution of the first whales and lost mitochondria from the original endosymbiotic event D. None of these answers are plausible
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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