Which of the following are reasons that prokaryotic cells may secrete proteins?

Question

Which of the following are reasons that prokaryotic cells may secrete proteins?

A. Some secreted proteins are enzymes that are needed for breaking down environmental macromolecules into smaller subunits for transport into the cell.

B. Some secreted proteins make up extracellular appendages such as flagella, which are used for movement.

C. Some proteins are secreted so that they can be activated by membrane components.

D. Some proteins are made by mistake and are secreted because they are not needed by the cell.

Explanation / Answer

Answer:

A prokaryotic cells may secrete proteins due to the following reasons:

A. Some secreted proteins are enzymes that are needed for breaking down environmental macromolecules into smaller subunits for transport into the cell. Example: Extracellular enzymes like Amylase, Lipase, Protease.

B. Some secreted proteins make up extracellular appendages such as flagella, which are used for movement. Example: Flagellin

C. Some proteins are secreted so that they can be activated by membrane components. Example: cell membrane integral proteins.

*In procakyotes, the proteins are not made by mistake as their are limited number of genes which encodes for specific proteins required for various functions.

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