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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.
Megaloblastic Anaemia Megaloblastic anaemia refers to the abnormal development of red cells i.e. megaloblasts in the bone marrow. Etiology It is due to lack of f
Q What is the kind of nitrogen waste that mammals eliminate? Like chondrichtian fishes and adult amphibians, mammals are ureotelic that is they excrete urea. Q. How do plac
In a neuron at rest, the membrane A. voltage will be less than zero. B. sodium conductance is greater than the membrane potassium conductance. C. voltage is less than the
Determine the blood plasma levels of glucagon A. production in the liver increases in response to an increase in blood plasma levels of glucagon. B. is secreted by alpha-isl
What is the histological nature of the glands? How are they formed? The glands are epithelial tissues. They are made of epithelium that throughout the embryonic development inv
Some important zoonoses Zoonoses are a heterogeneous group of diseases with a variety of causative agents. On the basis of causative agents, they are grouped into bacterial, p
For patients with end-stage heart failure, cardiac transplantation has become a promising therapy especially with the advent of immunosuppressive therapy and more careful screenin
What is protein denaturation? Is there any change in the primary structure when a protein is denatured? Secondary, tertiary and quaternary structures of proteins are spatial st
Ask question #What kinds of detritus or carrion can you observe in this ecosystem? Is there any evidence that scavengers, detritivores or decomposers are utilising this decomposing
Explain about the Observation and Classification of Arthropoda? Introduction In the previous unit you have examined the representatives of artliropoda. In this unit, you wi
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