Physical Features Of India
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This is a power point presentation which will enrich everyone's knowledge about the various Physical Features Of India.This is a simple power point presentation which has little writings and lot of pictures.
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RNA interference (RNAi) or Post-Transcriptional Gene Silencing (PTGS) is an important biological process for modulating eukaryotic gene expression.
It is highly conserved process of posttranscriptional gene silencing by which double stranded RNA (dsRNA) causes sequence-specific degradation of mRNA sequences.
dsRNA-induced gene silencing (RNAi) is reported in a wide range of eukaryotes ranging from worms, insects, mammals and plants.
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micro RNA (miRNA)
short interfering RNA (siRNA)
Properties of small non-coding RNA:
Involved in silencing mRNA transcripts.
Called “small” because they are usually only about 21-24 nucleotides long.
Synthesized by first cutting up longer precursor sequences (like the 61nt one that Lee discovered).
Silence an mRNA by base pairing with some sequence on the mRNA.
Discovery of siRNA?
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In 1993 Rosalind Lee (Victor Ambros lab) was studying a non- coding gene in C. elegans, lin-4, that was involved in silencing of another gene, lin-14, at the appropriate time in the
development of the worm C. elegans.
Two small transcripts of lin-4 (22nt and 61nt) were found to be complementary to a sequence in the 3' UTR of lin-14.
Because lin-4 encoded no protein, she deduced that it must be these transcripts that are causing the silencing by RNA-RNA interactions.
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MiRNA
Length (23-25 nt)
Trans acting
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Length ; 25 to 36 nt.
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dsRNA-induced gene silencing (RNAi) is reported in a wide range of eukaryotes ranging from worms, insects, mammals and plants.
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Physical Features Of India
- 1. PHYSICAL FEATURES OF INDIA Done by Chris Vinod
- 2. MAJOR LANDFORMS OF INDIA 1. Plains 2. Deserts 3. Plateaus 4. Mountains 5. Islands 6. Rivers
- 8. NOW LET’S WATCH A VIDEO ON THE MAJOR DIVISIONS OF INDIA
- 10. MAJOR PHYSIOGRAPHIC DIVISIONS 1. The Himalayan Mountains 2. The Northern Plain 3. The Peninsular Plateau 4. The Indian Desert 5. The Coastal Plains 6. The Islands
- 16. THE ISLANDS
- 17. THE END