Ions are transported across the cell membranes by means of

Options :
  1. primary protein
  2. secondary proteins
  3. tertiary proteins
  4. contractile proteins
Answer and Explanation :-

Answer: Option 3


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Before I go," he said, and paused -- "I may kiss her?"It was remembered afterwards that when he bent down and touched her face with his lips, he murmured some words. The child, who was nearest to him, told them afterwards, and told her grandchildren when she was a handsome old lady, that she heard him say, "A life you love.
-Charles Dickens A Tale of Two Cities