Causes Succession

Allogenic factors –  Chemical weathering of rocks or filling in by sand/silt in a pond

Autogenic factors – Autogenic factors include – Immigration, Growth, Reaction, Coactions

TLS Online TPP Program

#Id: 1458

#Unit 4. Cell Communication and Cell Signaling

The formation of many cell-cell adhesions entails two types of molecular interactions:

1. Trans binding interactions 

2. Cis binding interactions

TLS Online TPP Program

#Id: 3516

#Unit 2. Cellular Organization

Two genes may share some related exons but also have unique exons.

TLS Online TPP Program

#Id: 9921

#Unit 4. Cell Communication and Cell Signaling

Cell-Mediated Immunity against Virus

Both CD8+ TC cells and CD4+ TH1 cells are required components of the cell-mediated antiviral defense.

Activated TH1 cells produce IL-2, IFN-ϒ, and tumor necrosis factor-α.

TLS Online TPP Program

#Id: 4629

#Unit 13. Methods in Biology

A number of enzymes have been employed for ELISA, including alkaline phosphatase, horseradish peroxidase, and -galactosidase. These assays approach the sensitivity of RIAs and have the advantage of being safer and less costly.

TLS Online TPP Program

#Id: 1434

#Unit 4. Cell Communication and Cell Signaling

Three major classes of animal-cell junctions: 

1. Anchoring junctions

2. Tight junctions

3. Gap junctions