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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.
Phylum Sarcdina 1) They move by means of pseudopodia (ralse feet) or similar structures. 2) They feed heterotrophically by phagocytosis. Some examples: Amoeba, Entamo
Define drug effects on food intake - cause dry mouth? cause dry mouth (xerostomia) : Lack of saliva makes it difficult to masticate and swallow foods, especially those of a dry
1. Describe how the various molecular mechanisms act to regulate transcription of the genes within the lactose operon of E. coli . 2. Transcription of a eukaryotic protein-codi
Q. Can you explain Antibiotics? The antibiotics are the chemicals produced by microorganisms which are able to destroy or inhibit the growth of other microorganisms. The therap
a - HELIX In this intra molecular hydrogen bonds are present The polypeptide chain is spirally coiled, generally in a clock-wise or right handed fashion. Glycine
Chemistry of Living Matter All living things including ourselves, are made of protoplasm. Protoplasm is essentiallya colloidal suspension of proteins in a w&ery solution. It is c
Name three effects that inbreeding can have on a population. Inbreeding can decrease the number of offspring produced, increase susceptibility to disease, reduce genetic varia
Concerning the nitrogen-containing bases that participate in nucleotides, what is the difference among DNA and RNA? In DNA nucleotides can be formed of adenine (A), thymine (T)
SUBERIN It is a lipid formed by esterification of phellonic acid or its derivative with glycerol. Suberin occurs in the walls of cork cells and endodermal cells. It makes
Define Food availability and Food Access? Food availability: This refers to availability of necessary types of food in sufficient quantity, to the individual. The sources may b
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