Allosteric enzyme regulation is usually associated with

a) feedback inhibition
b) activating activity
c) an enzyme with more than one subunit
d) the need for cofactors

The correct answer is: C) an enzyme with more than one subunit

An allosteric regulation of an enzyme refers to the binding of effector molecules at a site other than the enzyme's active site. That site is called the allosteric site or regulatory site. When the regulator (effector molecule) binds enzyme usually goes through conformational change. When the activity of the enzyme is reduced, we call effector molecule inhibitor, otherwise it is activator.

Allosteric enzymes usually have multiple active sites located on different protein subunits, but when one effector molecule binds all sites on different subunits are changed .

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

many phylogenetic trees have a single lineage at the base representing a common ancestor. a lineage that evolved early from the root and remains unbranched is called basal taxon. when two lineages stem from the same branch point, they are called sister taxa.

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explanation: