A group of researchers set out to elucidate some essential properties cellular c

Question

A group of researchers set out to elucidate some essential properties cellular connections that allow movement of molecules betweedfor the passage of ions ana cells not of gap junctions. Gap junctions are rough gap junctions but the junction channels allow for the passage of ions and mino acids (monomers) or peptide molecules with different masses and this data t only interacted th molecules. They tested their hypothesis by culturing rat liver cells in a monolayer. Single ce injected with single a was collected: Molecular mass Transfer to adjacent cells Molecular mass (Daltons) 851** 901 946 1004 1158 1830 Transfer to adjacent cells (Daltons) 376 464 536 559 665 817 The number of pluses indicates the relative speed of transfer. A minus no transfer. Some molecules did not behave as predicted. 25. Based on the data collected we could hypothesize: A. A 200 D molecule would transfer faster than a 665 D molecule. B. A 665 D molecule would transfer faster than a 200 D molecule. C. A 951 D molecule would transfer to adjacent cells quickly. D. A 500 D molecule will never transfer to adjacent cells. E. No hypothesis can be drawn from these data. 26. These cells are rat liver cells, but if this research group decided to do a similar test in plants which cell junctions would be suitable to test cell to cell connection channels. A. Tight junctions B. Plant/Flower Junctions C. Middle lamella D. Plasmodesmata E. Plants do not have cell junctions. 27. Which statement best describes the variation in the membranes (plasma and endo- membranes) of eukaryotic cells? A. Phospholipids are found only in certain membranes. B. Only certain membranes of the cell are selectively permeable. C. Only certain membranes are constructed from amphipathic molecules. D. Some proteins are unique to each kind of membrane E. None of the above

Explanation / Answer

25. 200 D molecules will transfer faster than 665D molecules.

26. Plasmodesmata are used in plants.

27. Certain membrane of cell are selectively permable.

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