Friday, March 03, 2006

Making a cell.

The broad processes of bacterial metabolism (fueling, biosynthesis, polymerisation, assembly, and cell division) are interrelated by the fact that each requires as a starting material the products of the preceding phase.

Study Questions:
For each phase list the starting materials and products.
(No more than one phase answered per student, to spread out the activity.)


Could any phase be dispensible? If so under what circumstances?

2 Comments:

Blogger Archeak9 said...

Could any phase be dispensible? If so under what circumstances?

It is unlikely that a phase is completely dispensable for all products, but biosyntheses or metabolite production (part of fueling) is dispensable for some products that can be absorbed directly form the environment.

Utilisation Mutants are defective in their ability to use certain carbon or nitrogen sources and must derive metabolite from the environment in a form (such as glucose) on the main metabolic pathway .

Auxotrophic Mutants / Nutritional mutants cannot synthesize a particular metabolite or amino acid but can absorb it from the environment.

March 09, 2006 11:52 am  
Blogger Microbe Pundit said...

Yes, thats the correct answer Archeak9.

But you dont have to be a mutant to use amino acids from the environment.
Eg Lactobacilli use many nutrients from the environment and don't make all their own amino acids. Bypassing this biosynthesis can offer growth advantages for some organisms in nutrient rich environments.

March 10, 2006 10:27 am  

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