Which of the following is a function of the plasma membrane? control center of t

Question

Which of the following is a function of the plasma membrane? control center of the cell protein synthesis lipid synthesis regulation of the passage of material into and out of the cell digestion of organic materials inside the cell Which of the following is/are function(s) of cell membrane proteins? may be attached to the cytoskeleton for structural support may be receptor proteins for hormones may play a role in transporting hydrophilic substances in and out of cells All of the above are true. Choose the CORRECT statement concerning the plasma membrane. Hydrophilic ends face towards water. Hydrophobic ends inwards, toward themselves. Proteins are embedded into the plasma membrane. The plasma membrane is a fluid mosaic model structure. All of the choices are correct. Osmosis can be defined as the diffusion of water. the diffusion of nonpolar molecules. active transport. the diffusion of a solute. endocytosis. If human white blood cells were taken from the circulatory system, and then placed into an iso solution, which of the following is most likely to occur? Water will rush into the cells and the cells will swell and eventually burst. Because there is more water outside the cell than inside the cell, an equal amount of water will e cell and leave the cell. There will be no change in the cells because the isotonic environment is in equilibrium with the c Because a hypertonic environment is highly acidic, these cells will become acidic as well. Water will diffuse out of the cells, and they will decrease in cell volume. Which of the following is true regarding active transport? Active transport requires energy. Molecules are moved across a plasma membrane from an area of higher concentration to an a lower concentration. Active transport relies on the process of diffusion. Molecules to be transported attach to phospholipids in the plasma membrane; as the phosph change shape, the molecules are moved across the membrane. This mechanism allows a cell to equalize the concentration of molecules on either side of th membrane. Active transport is like facilitated diffusion in that both processes move molecules down their concentration gradient. require the presence of proteins in the plasma membrane that move molecules from one si plasma membrane to the other. require the conversion of ADP to ATP. do not require a source of energy. facilitate the movement of water through the phospholipids of the plasma membrane.

Explanation / Answer

1-D

Being a semipermeable membrane plasma membrane regulates the incoming and outgoing of materials.

2-D

Plasma membrane can acts as hormone receptor, channelling for in and out movement of hydrophobic molecules, and structural supportive tool.

3-D

All of these are structural properties of plasma membrane.

4-A

Osmosis takes place when there is concentration gradient across a membrane. Water will move towards the high solute concentration.

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