Glycoproteins can permit some invertebrates to withstand temperatures as low as –18°C without freezing. 

Antarctic fish also have glycoproteins in their blood and some species accumulate sodium, potassium, or chloride ions or urea, all of which lower the blood freezing point.

TLS Online TPP Program

#Id: 7458

#Unit 5. Developmental Biology

The binding of ammonia to the sensor domain of DhkC leads to the activation of its histidine kinase activity and to the autophosphorylation of a DhkC histidine residue.

TLS Online TPP Program

#Id: 3536

#Unit 2. Cellular Organization

Human mitochondrial DNA has 22 tRNA genes, 2 rRNA genes, and 13 protein-coding regions. 

TLS Online TPP Program

#Id: 9380

#Unit 11. Evolution and Behavior

Innate behaviour

Reflex - Allow us to move in response to something in the environment.

The reflex which causes us to close our eyes when something flashes towards us, or to withdraw a foot when we step on a sharp object.

TLS Online TPP Program

#Id: 1913

#Unit 4. Cell Communication and Cell Signaling

T2 cells also express BAFF-R, the receptor for the B-cell survival factor BAFF, whose expression is dependent on signals received through the BCR.

As B cells differentiate from the transitional T2 state to full maturity, they raise their levels of mIgD still further, while reducing the expression of mIgM. They also cease to express CD24 and CD93.

TLS Online TPP Program

#Id: 9955

#Unit 4. Cell Communication and Cell Signaling

Subcutaneous infections are normally introduced by trauma and accompanied by inflammation; when inflammation is chronic, extensive tissue damage may ensue.