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Dictionary » T » Transition

Transition

Definition

noun, plural: transitions

(genetics) A substitution mutation in which a purine is replaced by another purine (e.g. A → G) or a pyrimidine with another pyrimidine (e.g. T → C).

(reproductive biology) The stage of childbirth that occurs before the expulsive phase of labor, and characterized by strong uterine contractions and nearly full cervical dilation.

(general) The passing from one state, form, style or place to another.

verb

To make or undergo a transition.


Supplement

Word origin: L. Transitio: cf. F. Transition. See transient.
Related forms: transitional (adjective)

Compare: transversion (genetics)
See also: point mutation (genetics)


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The REVOLUTION of Life

... by Oparin, which are always enthusiastically taken up by believers in the “natural” Origin of Life on Earth, as un-dismissible proof that such a transition had indeed occurred, but they thought that the overall process was still one of gradual, step-by-step change: that it gradually emerged!. ...

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by Shape
Thu Aug 27, 2009 2:58 pm
 
Forum: Evolution
Topic: The REVOLUTION of Life
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Views: 60

Re: Enzymes and activation energy.

... By providing an alternative reaction route and by stabilizing intermediates the enzyme reduces the energy required to reach the highest energy transition state of the reaction. The reduction of activation energy (ΔG) increases the number of reactant molecules with enough energy to reach the ...

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by kolean
Wed Jul 08, 2009 5:04 pm
 
Forum: Molecular Biology
Topic: Enzymes and activation energy.
Replies: 4
Views: 382

Enzymes and activation energy.

... molecule, by utilizing its charged or non polar side chains. This in turn increases the rate of reactivity of the substrate and stabilizes the transition state. New to biology

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by NewtoBiology
Wed Jul 08, 2009 2:09 am
 
Forum: Molecular Biology
Topic: Enzymes and activation energy.
Replies: 4
Views: 382

Re: Any SOLID arguments against evolution?

... just like you have flexibility in your model. The rabbits are still rabbits, and the fossil record shows fully formed organisms, not extinct transitions which were not selected (not deformities but species who didn't make it because they were in transition). Try to cross a dog with a cat ...

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by AFJ
Mon May 25, 2009 1:18 am
 
Forum: Evolution
Topic: Any SOLID arguments against evolution?
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Views: 16659

cell fusion

... diagrams when possible. (a) The activation of DNA synthesis may result from the stimulatory activity of one or more cytoplasmic factors. (b) The transition from S to G2 may result from the presence of a cytoplasmic factor that inhibits DNA synthesis. (c) The transition from G2 to mitosis may ...

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by jello22
Thu Apr 30, 2009 3:02 pm
 
Forum: Cell Biology
Topic: cell fusion
Replies: 0
Views: 541
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