Atrial systole 

Increase in atrial pressure is reflected back to the veins, it appears on the venous pulse record as the a wave.

TLS Online TPP Program

#Id: 469

#Unit 2. Cellular Organization

Introns evolve or accumulate mutations/changes much more rapidly than exons

TLS Online TPP Program

#Id: 470

#Unit 2. Cellular Organization

Intron do not face selective pressure to produce a polypeptide with a useful sequence hence highly variable.

TLS Online TPP Program

#Id: 471

#Unit 2. Cellular Organization

Exon sequences are conserved by the negative selection of individuals in which the sequences have changed

TLS Online TPP Program

#Id: 472

#Unit 2. Cellular Organization

Most intron mutations are expected to be selectively neutral except branch site, splicing junctions, and sequences influencing splicing

TLS Online TPP Program

#Id: 473

#Unit 2. Cellular Organization

A mutation that confers a more advantageous phenotype to an organism, relative to Individuals in the same population without the mutation, is positive selection of that organism.

TLS Online TPP Program

#Id: 474

#Unit 2. Cellular Organization

Mutations conferring antibiotic resistance in bacteria or venom-resistance of pray is example of positive selection of mutation in exons