26. What are the two distinct \"faces\" of the phospholipids that make up membra

Question

26. What are the two distinct "faces" of the phospholipids that make up membrane of a cel1? A) a hydrophilic head and a hydrophobic tail B) a hydrophobic head and a hydrophilic tail C) a phosphate group head and two fatty acid tails D) Both a) and c) are correct. E) Both b) and c) are correct 27. What is the most important barrier protecting the inner contents of an animal cell from its exterior environment? A) the cellular membrane B) the cell wall C) the nucleus D) the cytoskeleton E) Both a) and b) are correct. 28. Which of the following is the outermost feature on the surface of a plant cell? A) lipid bilayer B) cholesterol C) cell wall D) glycoproteins E) sugar molecules 29. The net movement of molecules from locally concentrated regions to uniform distributions is best described as: A) active transport B) passive transport. C) diffusion. D) enthalpy E) concentration gradient. 30. The primary function of molecular membranes is the transport of ions and molecules irn and out of cells-transport is directional and selective. The moving of molecules from areas of high concentration to that of low concentration to gain energy is best described as: channel mediated diffusion. B) electron transport A) active transport. D) inactivated transport E) passive transport.

Explanation / Answer

26. D) both a and c are correct

phosphate groups are hydrophilic in nature and fatty acids are hydrophobic

27. A) cellular membrane

28. C)cell wall

in animal cells there is cellular membrane situated outside.

29. C)diffusion

it is somple definition of diffusion

30. E)passive transport

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