46- Sup cells in cultu pose you are studying the transport of a certain polar mo

Question

46- Sup cells in cultu pose you are studying the transport of a certain polar molecule across the plasma memb nd re. Over a period of time, you measure the concentration of a polar molecule inside a ly outside of the cells. You find that the concentration of the molecule is lower in the cell but is gradual s not changing. increasing. You also measure the ATP concentration inside the cell and find that it i Which of the following is probably responsible for the transport of this polar substance into the cell? B. secondary active transport D. active transport A. facilitated diffusion E. simple diffusion C. endocytosis 47- A cell's plasma membrane contributes to homeostasis by A. acting as a selective barrier B. functioning as a fluid mosaic of lipid and protein. C. maintaining the shape of the cell. 48- A protein with an internal signal sequence is most likely to be located in: A. the nucleus. B. a mitochondrion. C. the cytoplasm 49-An amphipathic molecule is one that: 50- Which of the following eukaryotic cell structures plays a role in protein trafficking and sorting? 51. Which of the following reproduce by binary fission? D. a chloroplast. E. the extracellular space A. contains both polar and nonpolar regions. A. mitochondria B. lysosomes B. has only hydrophobic region. C. the endoplasmic reticulum D. the Golgi apparatus E. vacuoles A. bacteria B. archaea C. chloroplasts D. mitochondria E. All of these choices are correct.

Explanation / Answer

The process of transport of polar substances across cells is called facilitated diffusion.

47. B. Functioning as a fluid mosaic of lipid and protein.

48. E. Extra cellular space.

49. A. Contains both polar and non polar regions

50. C. Endoplasmic reticulum

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