Q. Membrane surface area and cell volume are two physical variables that are relevant in explaining the difference in size and complexity between prokaryotic and eukaryotic cells. Which of the following statements about these variables is correct? The ratio of plasma membrane area to total cell volume increased in early eukaryotes which allowed for greater morphological complexity. The total membrane area dedicated to oxidative phosphorylation is greater in eukaryotes. Although physically smaller, prokaryotic cells have more total cell volume than a typical eukaryotic cell. In prokaryotic cells, the membrane location of ATP synthase is the same as that for glucose import. A. 1,2 and 3 B. 1 and 3 C. 2 and 4 D. 4 only E. All of 1,2,3 and 4 are correct
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.
Q. Membrane surface area and cell volume are two physical variables that are relevant in explaining the difference in size and complexity between prokaryotic and eukaryotic cells.
Which of the following statements about these variables is correct?
- The ratio of plasma membrane area to total cell volume increased in early eukaryotes which allowed for greater morphological complexity.
- The total membrane area dedicated to oxidative phosphorylation is greater in eukaryotes.
- Although physically smaller, prokaryotic cells have more total cell volume than a typical eukaryotic cell.
- In prokaryotic cells, the membrane location of ATP synthase is the same as that for glucose import.
A. 1,2 and 3
B. 1 and 3
C. 2 and 4
D. 4 only
E. All of 1,2,3 and 4 are correct
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