The ribosome coordinates the correct recognition of the mRNA by each tRNA and catalyzes peptide-bond formation between the growing polypeptide chain and the amino acid attached to the selected tRNA.

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#Unit 4. Cell Communication and Cell Signaling

Some Cytotoxic T cells express on their surface FasL, a natural ligand molecule related to TNF

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#Unit 4. Cell Communication and Cell Signaling

FasL on the cytotoxic T cell binds to its receptor, the Fas protein on the tumor cells, an apoptotic signaling pathway in the tumor cells becomes activated, which leads to tumor cell death.

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#Unit 4. Cell Communication and Cell Signaling

Apoptosis 

genetically regulated process

Cell destroys itself (programmed cell death)

marked by the breakdown of cell components

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#Id: 10496

#Unit 4. Cell Communication and Cell Signaling

TLS Online TPP Program

#Id: 10497

#Unit 4. Cell Communication and Cell Signaling

Necrosis

occurs when cells are subjected to injury or excessive stresses, such as heat, absence of oxygen, or infection

by pathogens & marked by swelling and bursting of cells with release of their contents.

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#Unit 4. Cell Communication and Cell Signaling

Necroptosis

A type of necrosis triggered by extracellular hormones that causes inflammation