transition mutationa
base pair substitution in which the orientation of the
purine and
pyrimidine bases on each
DNA strand remain the same; i.e., AT to GC, TA to GC ...
Full article >>>Transitional Vertebrate
Fossils FAQ
[Last Update: March 17, 1997]
wrote this FAQ as a reference for answering the "there aren't any
transitional
fossils" statement that pops up on talk.
origins several times each year.
Full article >>>In a chemical re
action, an unstable and high-energy configuration assumed by reactants on the way to making products.
Enzymes are thought to bind and stabilize the
transition state, ...
Full article >>>CATALYZING CAREER
TRANSITIONS TO COMPUTATIONAL
MOLECULAR BIOLOGYPOSTDOCTORAL FELLOWSHIPS IN COMPUTATIONAL
MOLECULAR BIOLOGY(second announcement) ...
Full article >>>The
mitochondrial permeability
transition (mPT) involves the opening of a non-specific pore in the inner membrane of
mitochondria, converting them from
organelles whose production of
ATP sustains the
cell, to instruments of death.
Full article >>>TransitionThe term proposed by Freese (1959) for a
mutation caused by the
substitution in
DNA or
RNA of one
purine by the other, and similarly with the
pyrimidines. (Cf.
transversion.)
Related Terms:
Mutation ...
Full article >>>Transition in the
species composition of a biological
community, often following ecological disturbance of the
community; the establishment of a biological
community in an area virtually barren of life.
ecology[Gk. oikos, home + logos, a discourse] ...
Full article >>>Transition states
Fig-1 demonstrates the relationship between
activation energy (
Ea
) and enthalpy of formation ("H) with and without a catalyst. The highest energy position (peak position) represents the
transition state.
Full article >>>Transition vesicles pinch off from the surface of the
endoplasmic reticulum carrying
integral membrane
proteins soluble
proteins awaiting
processing processing enzymes ...
Full article >>>Transition mutation A
base substitution mutation where a
purine is replaced by a different
purine, or a
pyrimidine is replaced by a different
pyrimidine.
Full article >>>transition re
action Biochemical process of converting 3-carbon pyruvate into 2-carbon acetyl and attaching it to
coenzyme A (CoA) so it can enter Kreb's cycle. Carbon dioxide is also released and NADH is formed (from NAD and H) in this process.
Full article >>>transition state - structure that forms
transiently in the course of a chemical re
action and has the highest free energy of any re
action intermediate; a rate-limiting step in the
re
action.
Full article >>>transitional mutants A type of
mutation in which a single
purine-
pyrimidine base pair is replaced by another.
transitional zone A zone in which
populations from two or more adjacent communities meet and overlap.
Full article >>>Transition: A
nucleotide substitution in which one
pyrimidine is replaced by the other
pyrimidine, or one
purine replaced by the other
purine (e.g., A is changed to G, or C is changed to T) (contrast with
Transversion) .
Full article >>>The
transition state in a re
action is the point at which the
original bonds have stretched to their limit.
Transition states are only in existence for extremely brief (10-15 s) periods of time.
Full article >>>The
transition from the Medieval Warm Period to the Little Ice Age
Beginning of the Ottoman Empire, early expansion into the Balkans
The Avignon papacy
transfers the seat of the Popes from Italy to France ...
Full article >>>The
transition to modern
humans is one that people argue about. Did it happen subsequent to that time? Did it happen over a broad front? Did it happen to one group of individuals or one small tribe, who then became modern
humans?
Full article >>>An
antibody selected for its ability to catalyze a chemical re
action by binding to and stabilizing the
transition state intermediate. Catalytic
RNA (
ribozyme). A natural or synthetic
RNA molecule that cuts an
RNA substrate. Cation.
Full article >>>activation energy (DGo') The amount of energy (SI unit of joules) required to convert 1 mole of a reactant from the ground state to the
transition state.
Full article >>>Substitution mutations from one
pyrimidine to another or one
purine to another (horizontals in diagram) are called
transitions.
Mutations from a
pyrimidine to a
purine, or the reverse (verticals and diagonals in diagram), are called
transversions.
Full article >>>Redox-potential discontinuity. That depth below the sediment-water interface marking the
transition from chemically oxidative to reducing processes
Red tide. A dense outburst of phytoplankton (usually dinoflagellates) often coloring water red brown ...
Full article >>>'"/>