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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.
Select the two correct statements out of the four (a - d) given below about lac operon. 1. Glucose or galactose may bind with the repressor and inactivate it 2. In the absenc
Mitochondria, which fuel life's processes in all cells, uses nutrients from digested food and oxygen which has diffused across cell surface. In freshwater protozoans water expulsio
what about cytoplasmic sex determination
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what is the mode of nutrition in pisces
State about Heller's Nitric Acid Test Take 1 ml concentrated (fuming) nitric acid in a test tube and add 2 ml of urine by means of a pipette by the side of the test tube and la
(i) Name one fibrous and one globular protein. fibrous globular (ii) Outline the difference in structure between a fibrous and a globular protein. ' shows the ef
similarity between pisces & mammals about dirhynous condition......
Induction of hydrolases - Responses to Infection Plants do respond to attack by pathogens. To restrict their spread the cells synthesise and secrete enzymes to hydrolyse the c
What are some prophylactic measures for tapeworm infections? The main prophylactic measures against taeniasis and cysticercosis are: not to ingest raw or badly cooked swine or
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