SCIENCE
CELL BIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Small bodies floating in cytoplasm (or attached to the endoplasmic reticulum) that make proteins
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Supports/protects cell; controls movement of substances into/out of cell; separates cell from its environment
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Stiff, rigid structure that surrounds the cell membrane to support/protect the cell
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Clear, thick, jelly-like substance inside the cell membrane that contains the other organelles
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Detailed explanation-1: -Definition. The cell membrane, also called the plasma membrane, is found in all cells and separates the interior of the cell from the outside environment. The cell membrane consists of a lipid bilayer that is semipermeable. The cell membrane regulates the transport of materials entering and exiting the cell.
Detailed explanation-2: -The cell membrane is selectively permeable to ions and organic molecules and controls the movement of substances in and out of cells. The basic function of the cell membrane is to protect the cell from its surroundings. It consists of the phospholipid bilayer with embedded proteins.
Detailed explanation-3: -(1) Cell membranes are thin enclosures that form closed boundaries. (2) Cell membranes are made up of lipids, proteins and carbohydrates. (3) Cell membranes consists of a phospholipid bilayer. (4) Cell membranes are held together by non-covalent interactions (5) Membranes are fluid-like structure.
Detailed explanation-4: -The cell membrane, therefore, has two functions: first, to be a barrier keeping the constituents of the cell in and unwanted substances out and, second, to be a gate allowing transport into the cell of essential nutrients and movement from the cell of waste products.
Detailed explanation-5: -Answer and Explanation: The vital feature of the membrane that extensively transfers the molecules via the membrane is selective permeability. This characteristic property of the biological membranes allows the movement of some particular materials, not all.