Four classes of ATP-powered pumps:

P-class pumps

V-class pumps

F-class pumps

ABC Superfamily

TLS Online TPP Program

#Id: 9976

#Unit 4. Cell Communication and Cell Signaling

Formation of the Wnt/Fz/LRP complex at the cell

surface causes the adaptor protein Dishevelled, to bind to Fz and Axin to bind to LRP, resulting destabilization and inactivation of the destruction complex

TLS Online TPP Program

#Id: 3609

#Unit 3. Fundamental Processes

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.

TLS Online TPP Program

#Id: 8057

#Unit 1. Molecules and their Interaction Relevant to Biology

Cysteine, tryptophan, and methionine are not common amino acids: together, they constitute approximately 5 percent of the amino acids in a typical protein. Four amino acids—leucine, serine, lysine, and glutamic acid—are the most abundant amino acids, constituting 32 percent of all the residues in a typical protein.

TLS Online TPP Program

#Id: 3218

#Unit 4. Cell Communication and Cell Signaling

Chemical carcinogens classified into two general categories:
1. Direct-acting carcinogens
2. Indirect-acting carcinogens

TLS Online TPP Program

#Id: 3350

#Unit 3. Fundamental Processes

Methyltransferase catalyzes the transfer of the methyl group on O6 -methylguanine to a cysteine residue on the enzyme, thereby restoring the normal G in DNA.