14. An antiport would function as a symport if its orientation in the membrane w

Question

14. An antiport would function as a symport if its orientation in the membrane were reversed. --------------------------------------- ( ) ( )
15. A transmembrane pore can be formed by multiple amphipathic alpha helices. ----------------------------------------- ( ) ( )
16. Porin proteins form water-filled channels in the outer membrane of a bacterium and are mostly composed of beta sheets. ---- ( ) ( )
17. Glucose uniporters localize at the apical side of the intestinal epithelium. ------------------------------------------------------------ ( ) ( )
18. GAP junction is a selective pore for anions. ----------------------------------------------------------------------------------------------- ( ) ( )

please explain why

Explanation / Answer

14. An antiport would function as a symport if its orientation in the membrane were reversed
- false.
Because, antiport relates with the movement of molecules in opposite direction where as symport relates with same direction.

15. A transmembrane pore can be formed by multiple amphipathic alpha helices.

- true. They are made of alpha helices and beta strands may present in small quantities.

16. Porin proteins form water-filled channels in the outer membrane of a bacterium and are mostly composed of beta sheets

-true.

17.Glucose uniporters localize at the apical side of the intestinal epithelium

-false. Glucose uniporters are present in the surface absorptive cells of small intestine mucosa.

18. GAP junction is a selective pore for anions

- false. Because gap junctions allow the transport of both ions and also small molecules.

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