... of a human-caused mass extinction, known as the Holocene extinction event
. In that survey, the same proportion of respondents agreed with the ... an extinction through their own actions, or allow a natural extinction event
to occur through negligence.
Human attitudes on extinction
... copies of its genome.
The two genes that exists after a gene duplication event
are paralogs. Paralogs usually code for proteins with different function ... is orthologous. If they are paralogs and resulted from a gene duplication event
their function is probably too different.
... Recombination usually denotes a genetic event
that occurs during the formation of sperm and egg cells (especially ... during charging are recombined to form water.
In cosmology , the event
during which electrons became bound to nuclei . After recombination, ...
... enzyme plays a crucial role in maintaining genomic integrity, and massive activation of PARP-1 can deplete the cell of energy-providing molecules, an event
that sends signals from the nucleus for the mitochondrion to start the apoptotic process.
In the adult organism, the number of ...
Bones consist of living animal cells embedded in a calcium carbonate matrix that makes up the main bone material. In the event
of a broken bone, the cells are brought out of semi- stasis to repair the matrix.
Matrix comprises the other major constituent of bone. It has ...
... that are still present show clear similarities.
It is interesting to note that in some algae, chloroplasts seem to have arisen through a secondary event
of endosymbiosis, where an eukaryotic cell joined with a second eukaryotic cell containing chloroplasts, forming chloroplasts with four membrane ...
... In biology, depolarization refers to the event
a cell undergoes when its membrane potential grows more positive with respect to the extracellular solution. Depolarization typically results ...
... predispose to infection but other factors are also important ( pregnancy in women, prostate enlargement in men) and in many cases the initiating event
When the bacteria get out of the intestinal tract through a perforation (= a hole or tear, which could be caused by an ulcer , for ...
... gene pools ). The moment of extinction is generally considered to be the death of the last individual of that species. Extinction is not an unusual event
in geological time — species are created by speciation, and disappear through extinction.
Evolutionary biology ...
... of growth, is giving concern to civil liberties groups in the UK, where police have wide-ranging powers to take samples and retain them even in the event
1 DNA fingerprinting process
2 Considerations when evaluating DNA evidence ...
... influenced by the proximity of one gene to another. If two genes are located close together on a chromosome, the likelihood that a recombination event
will separate these two genes is less than if they were farther apart. Genetic linkage describes the tendency of genes to be inherited together as ...
Neutral theory of molecular evolution
... allele arises typically through the spontaneous mutation of a single nucleotide within the sequence of a gene. In single-celled organisms, such an event
immediately contributes a new allele to the population, and this allele is subject to drift. In sexually reproducing , multicellular organisms, the ...
... it evolved. In the peripheral region itself, we might find direct evidence of speciation, but such good fortune would be rare indeed because the event
occurs so rapidly in such a small population."
An unstated supposition is that, through competition, the descendant species eliminates the ...
... hydrophobic ).
Often, but not always, the intracellular events triggered by the external signal are considered distinct from the event
of "transduction" itself, which in the strictest sense refers only to the step that converts the extracellular signal to an intra cellular one.
... 2005 that detailed information about a new stem-cell line which was derived from human embryos under completely cell and serum free conditions. This event
is significant because exposure of existing human embryonic stem-cell lines to live animal cells and serum risks contamination with pathogens that ...