Phenotypic variation can be attributed to genetic and environmental influences. 

TLS Online TPP Program

#Id: 9472

#Unit 4. Cell Communication and Cell Signaling

Two mechanisms for terminating cytokine signaling:

1. Short-term regulation: SHP1

2. Long-term regulation: SOCS proteins

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#Id: 2819

#Unit 13. Methods in Biology

Ion-exchange chromatography relies on the attraction between oppositely charged stationary phase, known as an ion exchanger, and analyte.

TLS Online TPP Program

#Id: 2512

#Unit 13. Methods in Biology

Quantitative analysis (i.e., measurements of the relative amounts of different proteins in a sample) can be achieved by scanning densitometry .

TLS Online TPP Program

#Id: 8079

#Unit 13. Methods in Biology

α-helix has positive band at 190nm and negative bands at 222nm and 208nm.

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#Id: 767

#Unit 3. Fundamental Processes

Abortive transcription is when RNA Polymerase makes short transcripts, typically shorter than 10 nucleotides (nt), while still bound at the promoter.