If autophosphorylation of CheA protein does not occur, then Escherichia coli cells must be .

Options are no given in the question. The complete question is as follows:

If autophosphorylation of CheA protein does not occur, then Escherichia coli cells must be.

A. in a gradient of a chemoattractant.

B. in a gradient of a chemorepellant.

C. tumbling.

D. rotating flagella clockwise.

A. in a gradient of a chemoattractant

Explanation:

The autophosphorylation of CheA is described as the autophosphorylation of histidine kinase (s) (CheA protein) in the presence of MgCl 2 and ATP.

If autophosphorylation of CheA protein does not occur in Escherichia coli, then the cells of E.Coli undergo methylation events that allow cell in a gradient of chemoattractants which increases the activity of CheA and CheY-P and cells adapt according to the concentration of chemoattractant.

Hence, the correct answer is A.

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