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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.
Q. What are respiratory pigments? What is the respiratory pigment present in some arthropods? Which is the analogous molecule in humans? Respiratory pigments are molecules able
Stems transport liquids (a) Cut about 2 cm from the end of stems of celery and place them in cold water for about an hour to freshen. Next place the stems in dishes having red
What is Burden of Rheumatic Heart Diseases? Although in the twenty-first century RHD has been eradicated in western countries, in India and other developing countries it contin
Essential Features of Health Educator The health'educator should: be confident about the subject matter, be able to converse skillfully in the language which is un
How do derived characters help cladistic taxonomists determine phylogenetic relationships? A derived character is found only between members of a particular group. Thus, cladi
How the Required weight gain Calculated? Weight gain is another aspect deserving attention. 'Allowable' or recommended weight gain could be higher than for adults. The weight g
M protein of rheumatogenic GAS has distinct structural characteristics that are akin to human heart tissue, particularly sarcolemmal membrane proteins and cardiac myosin. The major
What are the stomata? How these structures participate in the plant transpiration? The Stomata (singular, stoma) are small specialized passages for gases and water present in t
Q. How does digestion in beings of the phylum Annelida work and which type of digestive system do they have? Digestion in beings of the phylum Annelida is extracellular. These
Describe Pressure Controlled Ventilation (PCV) This is a pressure cycled mode (machine delivers a set pressure - the tidal volume generated depends on how compliant the lungs
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