A substance that enters the cell without the expense of cellular ATP, but are too large to directly pass through the membrane, use membrane protein in order to gain access to the inside of the cell.
Further Explanation:
The plasma membrane is an outer boundary of the cell. It is composed of phospholipids and proteins. It is also called selectively permeable membrane because it allows only selective substances to cross. Transport across the membrane can be active and passive transport. Active transport requires energy for the movement of substances, whereas in passive transport the molecules move across the membrane without using energy. Water can freely move inside the cell with the help of aquaporins. Also, the osmotic gradient set plays a vital role in the transportation of water.
Glucose and electrolytes require energy to be transported. Facilitated diffusion is a passive movement of the molecules, across the “plasma membrane”, through the aid of the trans membrane protein or substrate-specific protein. This is used by the molecules that are not able to cross the phospholipid layer freely. But, it doesn’t need energy for the transportation process. Glucose is transported by this method.
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Answer Details:
Grade: High School
Subject: Biology
Chapter: Cell Biology
Keywords:
Glucose, transported, facilitated diffusion, water, transportation, permeable membrane, phospholipid, composed, plasma membrane, osmotic gradient.
