Homework Sourse61 Feedback inhibition select all that apply occurs in pathw
61.
Feedback inhibition (select all that apply)
occurs in pathways that require multiple enzymatic steps
can occur when the substrate inhibits the final enzyme in a pathway
occurs when the end product can inhibit an early enzyme in the pathway
can occur at an allosteric site of an enzyme
62.
The electron transport chain (select all that apply)
consists of a series of membrane bound electron carriers
directly produces ATP.
can be located in the mitochondrial inner membrane of eukaryotic cells
Consist of a series of oxidation and reduction reactions (or redox reactions)
12.
Molecules that form a metabolic pool (select all that apply)
are not typically part of catabolic reactions
reoccur in various key metabolic pathways
can serve as entry points for anabolic reactions
can serve as entry points for degradation reactions
46.
Functions of membrane proteins include
acting as membranes
acting as carriers
acting as connectors between cells
acting as receptors
acting as channels
| A. | occurs in pathways that require multiple enzymatic steps | |
| B. | can occur when the substrate inhibits the final enzyme in a pathway | |
| C. | occurs when the end product can inhibit an early enzyme in the pathway | |
| D. | can occur at an allosteric site of an enzyme |
Solution
61. A and D
Explanation: Feedback inhibition occur when end product of an enzyme catalyzed reaction binds to the allosteric site of the first enzyme of the overall pathway; thereby disallowing substrate to bind. As a result, further product will not be generated. This feedback inhibition occurs in pathways which require multi-enzyme. So, options A and D are correct.
Feedback inhibition generally inhibits the first reaction of a multi-enzyme pathway.
62. A, C and D
Explanation: Statement B is totally incorrect. In electron transport chain, ATP is not formed directly. First a series of electron carriers, with a series of redox reactions, produce a hydrogen gradient; which is extremely essential for generation of ATP. Rest of the statements is correct.
12. A, B, C and D
Explanation: All the statements are correct. Metabolic pool comprises anabolic as well as catabolic pathways, and enzymes and reactions related to them.
46. B, C, D, and E are correct statements.
Explanation: Membrane proteins do not act as membranes. They are only a part of the whole membrane. Statement \'A\' is incorrect. Rest of the statements is correct.
