Use the transmis to answer the following questions. sion electron micrograph of

Question

Use the transmis to answer the following questions. sion electron micrograph of Caulobacter crescentus a. Describe the morphology of Caulobacter. Which protein(s) would you hypothesize to be important to maintain the characteristic shape of Caulobacter cells? (1 point) b. What is the term used to describe the flagellar arrangement of Caulobact point) er crescentus? (1 c. For each strain listed below describe the expected phenotype with respect to both flagellum production and motility. (2 points) A mutant with a deletion of motA Absence of a basal body protein d. The Caulobacter crescentus holdfast is an extracellular polysaccharide located at the tip of the stalk and allows cells to bind to surfaces and in formations called rosettes as shown in the image at the right. What terms can be used to describe these properties of the holdfast? (1 point)

Explanation / Answer

a) A caulobacter has a rod shaped curved cresent like morphology with a constriction at the middle. One end possessing a flagellum. The CreS (crescentin) protein might be important to maintain this shape of Caulobacter.

b) Pili

c) the phenotype of a mutant with a deletion of motA would be like similar to the parent one but without flagellum

the phenotype due to absence of basal body protein will most likely result in straight shaped bacterium

d) adhesive, natural biological glue

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