Question

How does bulk transport of large molecules occur across the plasma membrane?

Answer 1

In addition to moving small ions and molecules through the membrane, cells also need to remove and take in larger molecules and particles . Some cells are even capable of engulfing entire unicellular microorganisms. You might have correctly hypothesized that the uptake and release of large particles by the cell requires energy. A large particle, however, cannot pass through the membrane, even with energy supplied by the cell.

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Answer 2

Bulk Transport

Bulk transport involves the cell membrane making vesicles to bring materials in and out of the cell.

There are two kinds of bulk transport:

1. Exocytosis: moving materials OUT of the cell.

2. Endocytosis: moving materials INTO the cell.

There are 2 types of endocytosis:

1 . Pinocytosis: bringing small molecules or liquids into the cell

2. Phagocytosis: bringing large molecules into the cell