Lack of water is the primary factor that determines that an area will be a desert

Hot desert.

Cold desert 

Desert    Location 

Sahara  N. Africa 

Kolahari                      S. Africa 

Coastal Atacama              Peru

Sonoran               North American 

Simpson          Australia 

 

TLS Online TPP Program

#Id: 7740

#Unit 1. Molecules and their Interaction Relevant to Biology

Atomic radii: The atomic radii of an atom depends on its position in the periodic table.

We can never determine the atomic radius of an atom because there is never a zero probability of finding an electron, and thus never a distinct boundary to the atom.

All that we can measure is the distance between two nuclei (internuclear distance).

TLS Online TPP Program

#Id: 5892

#Unit 3. Fundamental Processes

DNA polymerases fall into five families based on sequence homologies; the palm is well conserved among them, but the thumb and fingers provide analogous secondary structure elements from different sequences.

TLS Online TPP Program

#Id: 1758

#Unit 4. Cell Communication and Cell Signaling

Class II, but not class I, presentation is inhibited by treatment of the cells with an agent that blocks endocytic processing within the cell (chloroquine).

TLS Online TPP Program

#Id: 10421

#Unit 4. Cell Communication and Cell Signaling

Snail and Twist promote expression of genes involved in cell migration, loss of cell-cell adhesion, loss of cell polarity, and increase the production of proteases that digest the basement membrane

TLS Online TPP Program

#Id: 2893

#Unit 3. Fundamental Processes

DnaA is in the active form only when bound to ATP.