Which of the following is the function of cholesterol in the cell membrane? iden

Question

Which of the following is the function of cholesterol in the cell membrane? identifying the cell to other cells main component of the phospholipid bilayer helping to maintain fluidity in the membrane providing structural support of the cell, by attaching to the cytoskeleton transporting nutrients into the cell Which of the following statements is true among all types of passive transport? Proteins are not needed to transport molecules across the membrane. The concentration gradient is the driving force. Only small polar molecules are able to cross the plasma membrane. Ions never cross the plasma membrane by passive transport. When the red blood are place in distilled water they swell and burst because _______ It is a isotonic condition, the water movement is the same on both sides It is a hypotonic condition, the water is moving into the cell It is a hypertonic condition, the water is moving out of the cell Aquaporins _______ allow water to cross the plasma membrane via facilitated diffusion. allow water to cross the plasma membrane against its concentration gradient. allow for the active transport of water. help in the bulk transport of material in and out of cells Osmosis is the diffusion of water from an area of high concentration to an area concentration. Only water moves in osmosis! The diagrams below show the concentration water and salt inside the cell and the concentration of water and salt surrounding Complete the sentences below by comparing the concentration of the water inside the concentration outside the cell. Water will flow _______ into the cell out of the cell The cell will _______ shrink burst stay Water will flow _______ into the cell out of the cell The cell will _______ shrink burst

Explanation / Answer

1. Function of cholesterol in cell membrane is - main component of phospholipid bilayer. it has hydrophobic and hydrophilic portion. cholesterols OH group is attached to phosphate head.

it also help to maintain fluidity in the membrane. as it is big it prevent small molecule to cross the cell membrane. it also preventing other components becoming crystalline.

it also heil in identifing cells to others. it keeps the transducing proteins at specific site necessary for signal transduction.

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