All Life Forms Currently Have a Basic Cell Membrane So

question 45

Multiple Choice

All life forms currently have a basic cell membrane so we hypothesize that the earliest cells also had membranes.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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