Answer:
<em>The evidence that suggests RNA appeared before DNA is the fact that RNA can act as an enzyme to self-edit their own genetic code. </em>Moreover, it has the ability to store genetic information, while transfer and ribosomal RNA have the ability to translate genetic information into proteins.
Explanation:
RNA has a great capability as a genetic molecule, it once had to carry on hereditary process on its own. It is absolutely sure that RNA was the first molecule of heredity. However, a single stranded RNA is rather unstable and easily damaged by enzymes. By essentially multiplying the existing RNA molecule, and using deoxyribose sugar instead of ribose.
<em>The DNA evolved as a much more stable form to pass genetic information with accuracy. It shows a biological evolutionary purpose .</em>
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Yes coz it has all compont of cell like nucleus and others
In the gradual speciation<span> model, species diverge slowly over time in small steps while in the punctuated equilibrium model, a new species diverges rapidly from the parent species. The two key influencing factors on the change in </span>speciation rate<span>are the environmental conditions and the population size.</span>
Answer:
In Anfinsen's ribonuclease A renaturation experiment,he wanted to show that protein folding entirely resides within the amino acid sequence of protein.
Explanation:
He used ribonuclease A as a model and removed urea and 2ME from the folding solution.Under these condition, ribonuclease A regains it's biological activity.
This refolding occur in in vitro conditions.
This experiment discover an enzyme called protein disulfide isomerase(PDI) which catalyze the reduction of incorrect dissulfide bonds.This also helps in trapping protein in an incorrect conformationso that it can un fold and try agin.
This PDI plays important role in proper folding,and the active site of this enzyme have disulfide.
