Zinc Finger Motif

Zinc atom stabilizes the structure/fold by coordination bonds

Each motif contains about 30-50 amino acids

Contains regular patterns of Cys / His, which coordinate with Zinc atom

Contains one helix and two small anti-parallel beta sheets in each finger

Zinc holds helix and beta-sheets together

Helix binds to DNA

TLS Online TPP Program

#Id: 2183

#Unit 10. Ecological Principles

Succession, the gradual and continuous change in species composition and community structure over time

TLS Online TPP Program

#Id: 2184

#Unit 10. Ecological Principles

Causes Succession

TLS Online TPP Program

#Id: 2185

#Unit 10. Ecological Principles

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: 2186

#Unit 10. Ecological Principles

TLS Online TPP Program

#Id: 2187

#Unit 10. Ecological Principles

Step in succession

1. Nudation 

2. Migration 

3. Ecesis 

4. Aggregation

5. Competition 

6. Reaction 

7. Stabilization

TLS Online TPP Program

#Id: 2188

#Unit 10. Ecological Principles

Primary succession - refers to succession on a newly exposed site that was not previously occupied by soil and vegetation.

Secondary succession - refers to succession on a site that has already supported life but that has undergone a disturbance.