Explanation:
The proteins that form the pores are known as carrier proteins. They transport small water-soluble molecules like amino acids and ions across the membrane from areas of high concentration to areas of low concentration. Many water soluble solutes are transported by carrier proteins.

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Reference: Human Biology By Daniel D. Chiras, page No: 50.

Explanation:
Mycoplasma are unicellular prokaryotic organisms. They are smaller than viruses. They do not have a cell wall. The outermost limiting layer of the protoplast is a cell membrane which has a typical trilaminar unit membrane structure. Absence of cell wall makes these organisms highly plastic. Therefore, these can assume various shapes such as spherical, granular, filamentous, coccoid etc.

Reference: NCERT Biology Text, Class: XI, Unit III: Cell: Structure and Function, Chapter 8: Cell: The unit of life.