Movement is a type of response to stimuli. Many unicellular organisms can move in response to chemical changes outside the cell – amoeba exhibits locomotion, paramecium use cilia to get around. Protists such as the Amoeba and the Paramecium are important to our discussion of evolution because of their ability to respond to changes in the environment. These single-celled eukaryotes have this ability because a) their DNA responds to stimuli from the environment, b) they have the same germ cell layers that the Cnidaria have, c) new proteins, located in the cell membrane, have shapes and charge patterns that react to a stimulus by generating an electrical impulse. d) they have a Golgi Apparatus that measures the stimulus from the environment, e) none of these are possible.
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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Movement is a type of response to stimuli. Many unicellular organisms can move in response to chemical changes outside the cell – amoeba exhibits locomotion, paramecium use cilia to get around. Protists such as the Amoeba and the Paramecium are important to our discussion of evolution because of their ability to respond to changes in the environment. These single-celled eukaryotes have this ability because a) their DNA responds to stimuli from the environment, b) they have the same germ cell layers that the Cnidaria have, c) new proteins, located in the cell membrane, have shapes and charge patterns that react to a stimulus by generating an electrical impulse. d) they have a Golgi Apparatus that measures the stimulus from the environment, e) none of these are possible.
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