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Explain how early RNA molecules might have been able to respond to natural selection.
Every RNA molecule might have competed with slightly dissimilar RNA molecules for nucleotides. An RNA molecule that was more successful in getting nucleotides would have an advantage, and it would pass that advantage on to the new RNA molecules it formed by replicating.
Figure shows part of a DNA molecule (a) (i) What do the dotted lines in Figure represent? (ii) Name J to M. J.............................. K..............................
what year was homo erectus fossils found
Biological Adaptation These adaptations depend on the geology and basic fertility of the region and some of the mechanisms that are especially well developed in tropical rain
Indications for Gingival Curettage - Endodontic Surgery a) Persistent periradicular pathosis following endodontic treatment, b) Periradicular lesion that enlarges after endo
What is a species? The species is a set of living beings able to cross among themselves generating fertile offspring. This concept though does not apply to individuals of ex
Cell Theory The term cell was first used by an English cytologist, Robert Hooke (1665) not for unit protoplasmic masses, but for the well defined and empty compartments, he obs
The PCR (polymerase chain reaction) is an extremely simple as immensely powerful methods. It permits enormous amplification of any particular sequence of DNA
Q. What are the respective constituents of the gray matter and of the white matter of the spinal cord? The gray matter or gray substance of the spinal cord contains predominant
Dissolved oxygen - Aquatic Habitats Oxygen in the terrestrial ecosystems occurs in the atmosphere along with other gases in a certain fixed concentration however, in aquatic e
Truffles, morels and the many yeasts that are basic to fermentation processes belong to this group of fungi. These fung are termed as: a) Phycomycetes b) Ascomycetes c)
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