All Life Forms Currently Have a Basic Cell Membrane So

question 50

Multiple Choice

All life forms currently have a basic cell membrane so we presume that the earliest forms of life had this "fence" isolating the internal organization from the external chaos. It is likely that the primordial environment was acidic. In order for a cell to function in this type of environment, the cell membrane would have to include

• A) a sodium (Na⁺) pump.
• B) a proton (H⁺) pump.
• C) mitochondria underneath in order to provide energy for active transport.
• D) an acid-proof cell wall.
• E) a totally nonpermeable membrane.

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