Purines, however, are first synthesized from the sugar template onto which the ring synthesis occurs.

As a short-hand, the nucleotides that form the rungs of the ladder in the DNA double-helix are often referred to by biologists, as their base pair identity such as adenine ( A ), see: Category: Purines and: Category: Pyrimidines.

In normal spiral DNA the bases form pairs between the two strands: A with T and C with G. Purines pair with pyrimidines mainly for dimensional reasons-only this combination fits the constant width geometry of the DNA spiral.

In the genetic code, it is common for a single amino acid to be specified by all four third-position possibilities, or at least by both Pyrimidines and Purines ; for example, the amino acid glycine is coded for by the codon sequences GGU, GGC, GGA, and GGG.

This aircraft, which was planned for initial operational use about 1965, would be complementary to but likewise competitive with the four strategic ballistic missile systems, all of which are scheduled to become available earlier.

The technological, operative approach, which she calls extraverted, and the mystic, contemplative, psychological one, which she calls introverted are not mutually exclusive, but complementary instead, as meditation requires practice in the real world, and conversely.

However, the Greeks thought of the two qualities as complementary: the two gods are brothers, and when Apollo at winter left for Hyperborea, he would leave the Delphic oracle to Dionysus.

When a specific allophone ( from a set of allophones that correspond to a phoneme ) must be selected in a given context ( i. e. using a different allophone for a phoneme will cause confusion or make the speaker sound non-native ), the allophones are said to be complementary ( i. e. the allophones complement each other, and one is not used in a situation where the usage of another is standard ).

For example, as in pin and as in spin are allophones for the phoneme in the English language because they cannot distinguish words ( in fact, they occur in complementary distribution ).

However, when there are complementary allophones of a phoneme, so that the allophony is significant, things become more complicated.

Critics maintain that the terms “ complementary ” and “ alternative medicine ” are deceptive euphemisms meant to give an impression of medical authority.

Edzard Ernst has said that in Austria and Germany complementary and alternative medicine is mainly in the hands of physicians, while some estimates suggest that at least half of American alternative practitioners are physicians.

The terms ' integrative ' or ' integrated medicine ' indicate combinations of conventional and alternative medical treatments that have some scientific proof of efficacy ; such practices are viewed by advocates as the best examples of complementary medicine.

In molecular biology and genetics, the linking between two nitrogenous bases on opposite complementary DNA or certain types of RNA strands that are connected via hydrogen bonds is called a base pair ( often abbreviated bp ).

4-Both cells synthesize a complementary strand to produce a double stranded circular plasmid and also reproduce pili ; both cells are now viable donors.

In the first type, a researcher may design short pieces of DNA (" probes ") whose sequences are complementary to the mutated sequences.

Although it's increasingly common for couples – particularly younger couples – to have " power neutral " relationships and / or play styles, activities and relationships within a BDSM context are often characterized by the participants ' taking on complementary, but unequal roles ; thus, the idea of informed consent of both the partners becomes essential.

The two approaches are now regarded as complementary, each providing its own insights into the problem of chemical bonding.

In the Rigveda, earth and sky are frequently addressed as a duality, often indicated by the idea of two complementary " half-shells.

Single-strand breaks are repaired by DNA ligase using the complementary strand of the double helix as a template ,, with DNA ligase creating the final phosphodiester bond to fully repair the DNA.

Angles whose sum is a right angle are called complementary.

The number of rays in between the two original rays are infinite like those possible in the complementary angle.

The two approaches are complementary rather than competitive, but they do result in different perspectives and, sometimes, conflicts of opinion about matters of substance.

Here, complementary or quasi-complementary devices are each used for amplifying the opposite halves of the input signal, which is then recombined at the output.

And, as a matter of fact, Nicolas had slept in the park only part of one night, when he discovered that Munich's early mornings even in summer are laden with dew.

They are huge areas which have been swept by winds for so many centuries that there is no soil left, but only deep bare ridges fifty or sixty yards apart with ravines between them thirty or forty feet deep and the only thing that moves is a scuttling layer of sand.

Others are confined to vast reservations, and not only does the Australian government justifiably not wish them to be viewed as exhibits in a zoo, but on their reservations they are extremely fugitive, shunning camps, coming together only for corroborees at which their strange culture comes to its highest pitch -- which is very low indeed.

It seems that for Persia, and especially for this city, there are only two times: the glorious past and the corrupt, depressing, sterile present.

Willard Thorp, in his new book, American Writing In The Twentieth Century, observes, quite validly it seems: `` Certain subjects are conspicuously absent or have been only lightly touched.

The only factors that are personally set by the choreographer are the movements themselves, the number of the dancers, and the approximate total duration of the dance.

The most effective political inventions seem to make maximum use of natural harbors and are aware that restraining breakwaters can play only a minor part in the whole scheme.

We have staved off a war and, since our behavior has involved all these elements, we can only keep adding to our ritual without daring to abandon any part of it, since we have not the slightest notion which parts are effective.

Apart from the categorical imperative they derive from the metaphysics of the orgasm, the only affirmation they are capable of making is that art is their only refuge.

The women who come to West Venice, having forsaken radicalism, are interested in living only for the moment, in being constantly on the move.

I have chosen to use the word `` mimesis '' in its Christian rather than its classic implications and to discover in the concrete forms of both art and myth powers of theological expression which, as in the Christian mind, are the direct consequence of involvement in historical experience, which are not reserved, as in the Greek mind, only to moments of theoretical reflection.

By `` image '' is meant not only a visual presentation, but also remembered sensations of any of the five senses plus the feelings which are immediately conjoined therewith.

Well, after everybody has followed the New England pattern of segregating one's children into private schools, only the poor folks are left.

Since the hazards of poor communication are so great, p can be justified as a habitable site only on the basis of unusual productivity such as is made available by a waterfall for milling purposes, a mine, or a sugar maple camp.

The networks for military communications are one of the best examples of networks which not only must be changed with the changes in objectives but also must be changed with the addition of new machines of war.

No questions, statements, or explanations are permitted -- only commands.

Of types of message listed in Table 1, commands and statements are the only ones sent through the vertical network shown in Figure 3.

Furthermore, the network in Figure 3 is only the basic net through which other networks pertaining to logistics and the like are interlaced.