Identify the 4 TRUE statements from the choices below. Lysosomes are vesicles in eukaryotes that contain hydrolytic enzymes. Proteins produced in the Golgi are then sent to the RER for modification. RER contains ribosomes on its surface. Chromosomes in eukaryotes are circular. Smooth endoplasmic reticulum is involved in lipid synthesis and storage of Ca2+ ions. Endosymbiosis describes how the nucleus evolved. The oldest prokaryotic cells in the fossil record are dated from fossilized algae. Plasmodesmata allow for fast communication of ions between cells (cytoplasmic exchange). The nucleolus region is the name for the area in a prokaryotic cell where the DNA is located.
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.
Identify the 4 TRUE statements from the choices below.
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Lysosomes are vesicles in eukaryotes that contain hydrolytic enzymes. |
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Proteins produced in the Golgi are then sent to the RER for modification. |
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RER contains ribosomes on its surface. |
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Chromosomes in eukaryotes are circular. |
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Smooth endoplasmic reticulum is involved in lipid synthesis and storage of Ca2+ ions. |
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Endosymbiosis describes how the nucleus evolved. |
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The oldest prokaryotic cells in the fossil record are dated from fossilized algae. |
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Plasmodesmata allow for fast communication of ions between cells (cytoplasmic exchange). |
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The nucleolus region is the name for the area in a prokaryotic cell where the DNA is located. |
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