Small ncRNAs involved in RNA splicing in the spliceosome are trimethylated at terminal guanine. This structure is called a trimethylated cap. The enzymes for these additional methyl transfers are present in the cytoplasm.

TLS Online TPP Program

#Id: 997

#Unit 5. Developmental Biology

The segment polarity genes encode proteins that are constituents of the Wnt and Hedgehog signaling pathways.

TLS Online TPP Program

#Id: 4635

#Unit 13. Methods in Biology

Colorimetric Assays for Cell Division Are Rapid and Eliminate the Use of Radioactive Isotopes

TLS Online TPP Program

#Id: 9464

#Unit 4. Cell Communication and Cell Signaling

The SH2 domain binds strongly to short target peptides containing a critical four-residue core sequence:: 

phosphotyrosine–glutamic acid–glutamic acid–isoleucine

TLS Online TPP Program

#Id: 10490

#Unit 4. Cell Communication and Cell Signaling

perforins punch holes in the endocytic vesicle membrane, allowing granzymes to enter the cytoplasm

TLS Online TPP Program

#Id: 1474

#Unit 4. Cell Communication and Cell Signaling

All integrins bind to proteins that consist of tripeptide sequence Arg-Gly-Asp, called the RGD motif