Which statement concerning receptor enzymes is CORRECT? They are not usually membrane-associated proteins. They contain an enzyme activity that acts on a cytosolic substrate. They contain an enzyme activity that acts on the extracellular ligand. They have an active site on the extracellular side of the membrane.

Explanation:

Receptor enzyme have three domains, i) extracellular domain, ii) trans-membrane domain and iii) cytosolic  domain.

They contain an enzyme activity that acts on a cytosolic substrate side.

They contain one of the following function:

Tyrosine kinase activity, tyrosine phosphatase activity, serine or threonine kinase activity, and guanylyl cyclase activity.

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explanation:

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affects the water bodies: excessive use of fertilizers causes eutrophication. the fertilizers which are used on plants affect the quality of land on which it is used, further causing erosion of soil. the fertilizers used on plants contain harmful chemical fumes which affect the environment.