TLS Online TPP Program

#Id: 2234

#Unit 11. Evolution and Behavior

Nucleotide changes, particularly those at the third position of the codon, that do not alter the amino acid sequence are called synonymous substitutions.

Nucleotide changes in a gene that alter the amino acid sequence of a protein are referred to as non-synonymous substitutions.

TLS Online TPP Program

#Id: 4006

#Unit 7. System Physiology – Animal

The SA node exhibits automaticity; it can spontaneously generate action potentials without neural input.

TLS Online TPP Program

#Id: 2340

#Unit 3. Fundamental Processes

When bound to the ribosome, stringent factor catalyzes formation of the unusual nucleotide guanosine tetraphosphate (ppGpp); it adds pyrophosphate to the 3 position of GTP, in the reaction.

TLS Online TPP Program

#Id: 10316

#Unit 4. Cell Communication and Cell Signaling

TLS Online TPP Program

#Id: 3369

#Unit 3. Fundamental Processes

DinB and UmuC are members of a distinct family of DNA polymerases found in many organisms known as the Y family of DNA polymerases. There are five translesion polymerases known in humans, four of which belong to the Y family.