The piRNAs which are 24–34 nucleotides long are derived in a manner that does not involve a dsRNA precursor

piRNAs are generated by processing long single-stranded transcripts covering so-called piRNA clusters found in the genome. This processing does not require Dicer.

TLS Online TPP Program

#Id: 532

#Unit 2. Cellular Organization

A mutation that confers a more advantageous phenotype to an organism, relative to individuals in the same population without the mutation, called as positive selection.

TLS Online TPP Program

#Id: 3699

#Unit 2. Cellular Organization

Genetic redundancy means that two or more genes are performing the same function and that inactivation of one of these genes has little or no effect on the biological phenotype

Redundancy seems to be widespread in genomes of higher organisms

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#Id: 5714

#Unit 7. System Physiology – Animal

Somatostatin binds membrane receptor, which is coupled to Galpha i protein.

TLS Online TPP Program

#Id: 5880

#Unit 10. Ecological Principles

Without some type of greenhouse effect, global temperatures would be much lower than they are, perhaps averaging only –17°C compared with the existing average of +15°C.

TLS Online TPP Program

#Id: 1680

#Unit 4. Cell Communication and Cell Signaling

P nucleotide addition results when the DNA hairpin at the coding joint is cleaved asymmetrically.