9.2 15- What are the different mechanisms by which cells regulate the activity o
ID: 149630 • Letter: 9
Question
9.2 15- What are the different mechanisms by which cells regulate the activity of enzymes? What is the selective advantage of feedback regulation in cellular metabolism? 16- Discuss the Davson and Danielli model of membrane architecture with regards to: The experimental observations the led to its proposition. Its limitations. a. b. 17- The fluid mosaic model of cells membrane: Indicate which molecular components make up each of the parts (the fluid one and the mosaic one respectively) What is (are) the function(s) of each of this constituents? Which property of membrane lipids is the basis for the bilayer nature of cell membranes? Explain with regard to the environment and the inner composition of living cells. Why is the cell membrane a two-dimensional fluid? What is the importance of membrane fluidity? Discuss the different mechanisms involved in homeoviscous adaptation as it happens in various cell types. a. b. c. d. e. f. icate 18- Discuss the influence of the fatty acid content of phospholipids on membrane fluidity (ind how it changes with the change in the characteristics of fatty acids).Explanation / Answer
15.
The different mechanism by which cell regulates the activity of enzymes are
Regulatory molecules: Activator and inhibitor molecules can bind to a specific region on the enzyme molecule and the enzymatic activity can be turned up or down.
Cofactors: Some enzyme need cofactors to be fully active cell might regulate the cofactors. Enzymes are only active when bound to cofactors.
Compartmentalization: Enzymes are stored in a specific location inside the cell. Only on reached the right condition it is released for the specific enzymatic reaction.
Feedback inhibition: Key metabolic enzymes are often controlled or inhibited the by the end product it produces. It prevents the cell form producing more of the end products which will be unnecessary. Regulation of blood glucose level is an example of feedback inhibition.
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