Below is a metabolic pathway having 3 chemical reactions and 3 enzymes. Enzyme 1 has 2 binding sites--1 for the substrate A and another for the end product D. As the pathway proceeds, the end product in higher quantities will react with enzyme 1, blocking the enzyme's binding to the substrate. Which statement is true about this pathway?
enz1 enz2 enz3
Substrate A --> B --> C --> D end product

All statements are true about this pathway.

Explanation:

This is the case of noncompetitive inhibition. In this type of inhibition, the inhibitor reduces or lowers the activity of the enzyme and binds equally well to the enzyme.

So as a result of noncompetitive inhibition, the enzyme will be inhibited and less substrate will be transformed into the end product which is D in this case and eventually this pathway will shut down.  

Also enzyme 1 has 2 binding sites, 1 for the substrate A and another for the end product D.

.

All options are true. This is an example of  end-product inhibition  which involved non- competitive inhibition.

Explanation:

As more and more products are formed, the product binds binds with the active sites. Therefore preventing the binding of the substrate to form enzyme-substrate complex at the active site. The end products thus acts as an inhibitor disrupting the hydrogen bonding and hydrophobic  interactions of the 3-D structure of protein which holds the active sites. therefore Enzyme active sites losses it specificity, and therefore unable to undergo further catalysis.

Because the end- product of the reaction block the activities of enzyme at   the active sites, it is an inhibitor, therefore the process is known  as End-product inhibition.

Because it is the only substance that  inhibits  with no other product to compete with, it is an example of non-competitive inhibition.

All the options are correct.

increase soil erosion                                             reduce soil erosion

cattle grazing                                                         hydroseeding

deforestation                                                         contour plowing

                                                                                planting vegetation

plant roots basically hold the top soil

together and stop soil erosion because

in such situation top soil is not removed

during flood but cattle grazing causes

soil erosion because cattle consume the

grasses and herbs and top soil is exposed.

same situation occurs because of

deforestation, the trees and plants are cut

down to expose top soil which causes soil

erosion