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.
Which of the following provides evidence that glycolysis evolved before the eukaryotic cell evolved?
Question 2 options:
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Evidence now supports the hypothesis that the first eukaryotic cell contained aerobic bacteria (mitochondria). The aerobic biochemical pathway found in mitochondria begins with the end product of glycolysis. |
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Glycolysis requires no oxygen; current evidence suggests that the original eukaryotic cell required oxygen (because it contained mitochondria). Geologic evidence supports the idea that the first cells on Earth existed long before oxygen levels began to build up. |
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In eukaryotic cells, most complex biochemical processes occur in or on membranous surfaces or organelles. Glycolysis takes place in the cytoplasm and its enzymes are not attached to membranous surfaces. |
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All of the above. |
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