Auxin enhances cell elongation in all of these ways except

acid induced denaturation of cell wall proteins.

Explanation:

Auxins by their physiological activity, resemble indole-3-acetic acid.  Its main function is to induce cell lengthening of plants.

In general, auxins can act in other processes, in addition to cell elongation, although this is considered decisive. They are characterized by having an unsaturated cyclic nucleus or derived from such acids.

acid-induced denaturation of cell wall proteins.

Explanation:

Auxins are very strong hormones which are produced by plants naturally. They are mostly found in shoot and root tips where they promote cell division, stem growth and root growth. They affect the plant orientation on the one-sided region by promoting or allowing cell division in response to sunlight.

During the extremely hot conditions, the proteins in the cell wall get denatured or destroyed. Denaturation of protein would result in the death of the cell, which is not the functioning of the auxins. Hence, acid-induced denaturation of cell wall protein is one such exceptional function of auxin.

osteogenesis imperfecta (oi) refers to a congenital ailment of bones. in the condition, the bones become brittle or fragile. this ailment is a general result of the defect or mutations in the genes (colia1 or colia2). this mutation results in imperfect collagen formation either in quantity or quality wise.  

there are eight kinds of oi defects, and each kind varies with certain distinctions in symptoms. the usual symptoms include frequent bone fractures, loss of hearing in infants, protruding eyes, discoloration of the white in the eyes, respiratory issues, loosening of the joints, short stature, and other symptoms.