Which of the following protein functions is not correctly associated with its co

Question

Which of the following protein functions is not correctly associated with its correct integral protein? carrier proteins- facilitate passage of molecules through the membrane enzymatic proteins- catalyze a specific reaction channel proteins - block the activity of carrier proteins cell recognition proteins - recognize pathogens the fluid-mosaic model of membrane structure refers to the fluidity of proteins and the pattern of phospholipids in the membrane the fluidity of the phospholipids and the pattern of proteins in the membrane the fluidity of cholesterol and the pattern of carbohydrate chains outside the membrane the lack of fluidity of internal membranes compared to the plasma membrane, and the ability of the proteins to move laterally in the membrane the fluidity of hydrophobic regions, proteins, and the mosaic pattern of hydrophilic regions. Which of the following has no effect on the fluidity of a membrane? concentration of sodium outside the membrane saturation of the fatty acids on the membrane concentration of cholesterol number of the carbons on the fatty acids of the membrane none of the above is correct Which of the following is NOT a function of proteins present in the plasma membrane? Proteins assist the passage of materials into the cell interact and recognize other cells bind with specific hormones carry out specific metabolic reactions produce lipid molecules the carbohydrate chains projecting from the plasma membrane are involved in adhesion between cells reception of molecules cell - to - cell recognition all of these are correct Which of the following help direct the movement of materials or organelles throughout the cell? rough endoplasmic reticulum cytoskeleton smooth endoplasmic reticulum all of the choices are true

Explanation / Answer

12. C

Channel protein will transport substance through membrane by passive diffusion. It will not block carrier proteins.

Carrier proteins transport both by active and passive transport.

13. B

Fluid - the free movement of the membrane which is made of phospholipid bilayer

Mosaic - arrangement or distribution of protein in the phospholipid bilayer.

14. A

The factors affecting fluidity are proteins, fatty acid and cholesterol.

Saturated fatty acid results in rigid membranes and unsaturated leads to loose membranes

Cholesterol act as a buffer which saves fluidity at low temperature

15. E

No protein can synthesize lipid molecules

16. D

17. B

Cytoskeleton is made of microfilaments and microtubules which spans the cell. The organelles are attached to the cytoskeleton and the framework Allows movement of organelles throughout the cell.

Rer and Ser - aids in protein synthesis and transport

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