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Asymmetry

Definition

noun

The lack or absence of symmetry


Supplement

In biology, the body plan of many organisms exhibit symmetry. Although the parts in a dividing plane or around an axis are not exactly the same, there is a significant correspondence in form, size, distribution, or arrangement of parts. Symmetry is observed particularly with regard to the external appearance of organisms. Bilateral organisms exhibit similarities between left and right sides. Radially symmetrical organisms have body plan in which every side is the same around an axis. In contrast, there are organisms lacking external symmetry. Flounders (adult form where both eyes are on one side) and hermit crabs (having a large claw on one side) are examples of organisms exhibiting asymmetry.


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Re: Yeast Mating Type Switching

... cerevisiae, mother cells but not daughter cells can switch mating type because they selectively express the HO endonuclease gene. This asymmetry is due to the preferential accumulation of an unstable transcriptional repressor protein, Ash1p, in daughter cell nuclei. Here it is shown ...

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by fiona1985
Mon Aug 15, 2011 10:30 am
 
Forum: Cell Biology
Topic: Yeast Mating Type Switching
Replies: 3
Views: 6245

DNA 3' end & 5' end

... it again twists itself in only one direction of the clock, but not the other way around? And apart from the twisting structure, is there any other asymmetry biological effect the double strand DNA molecule, say for example: replication in one direction (of the double strand, say from the long arm ...

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by bamboo
Wed Jul 20, 2011 1:40 pm
 
Forum: Molecular Biology
Topic: DNA 3' end & 5' end
Replies: 6
Views: 11670

Re: Yeast Mating Type Switching

thanks! B) How does the establishment of cell asymmetry in Caulobacter compare and contrast with the yeast model? Provide an illustrated response.

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by niravana21
Wed May 04, 2011 4:54 pm
 
Forum: Cell Biology
Topic: Yeast Mating Type Switching
Replies: 3
Views: 6245

Yeast Mating Type Switching

what is your question in B? A: Obviously it's the ASH1 mRNA location, which leads to the asymmetry. This assymetry is accomplished with the sequence at 3'-UTR, thus if you deleted it, the cell won't be polarized anymore and both new cells will become mother cells. On ...

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by JackBean
Wed May 04, 2011 9:48 am
 
Forum: Cell Biology
Topic: Yeast Mating Type Switching
Replies: 3
Views: 6245

Yeast Mating Type Switching

... to mother cells. The presence of the Ash1p protein is thought to control the activity of the HO gene in daughter cells: PART A How is this cell asymmetry brought about during the yeast cell cycle? What would be the effect of (i) of introducing a mutation into the ASH1 gene, and (ii) deleting ...

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by niravana21
Wed May 04, 2011 9:17 am
 
Forum: Cell Biology
Topic: Yeast Mating Type Switching
Replies: 3
Views: 6245
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