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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.
Of the following, which mechanisms are significant in the death of erythrocytes (pron: eh-rith-reh-sites) in human blood? Is it a) Phagocytosis (pron: fag-eh-seh-toe-sis) b)
Amylopectin Amylopectin forms a branched structure with about 30 glucose units in a chain among branches. There are usually slightly more 'outer' unbranched chains (called A-c
Transmission electron microscopy: Around 1931-32 two German scientists. Knoll and Ruska. Invented transmission electron microscopy, and built the first transmission electron m
Evolution of Metazoa The sponges, coming under phylum Porifera are the closest to Protista, and can perhaps be regarded even as a colony of protists rather than being multicel
Define the Food Sources of Thiamin? Thiamin is present in many food products and depending on the amount of vitamin present, we have categorized the foods as rich, good or fair
Q What are the major cells of which poriferans are made? Sponges have their external wall covered by flat cells called pinacocytes and having pores well-delimited by special ce
Define GHRH Receptors (Growth Hormone Releasing Hormone Receptors)? A. GHRH Receptors are only located in the plasma membranes of cells in the hypothalamus. B. GHRH Receptor
Are fruits always the flesh part of the "fruits"? Is the edible part of the onion a fruit? In some so-called fruits the actual fruit is not the flesh part. For instance, the fl
Composition The present day composition of atmosphere is the product of a lengthy evolutionary process that began more than four billion years ago. It is composed of a mixture
Define hexose monophosphate pathway The hexose monophosphate pathway (HMP also called the pentose phosphate pathway, or phoshogluconate pathway) consists of Mo irreversible o
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