About 25 percent of the filtered loads of sodium, chloride, and potassium are reabsorbed in thick segment of the ascending limb of loop of Henle

TLS Online TPP Program

#Id: 5043

#Unit 3. Fundamental Processes

Dam (Dam-) mutants accumulates hemimethylated products after replication.

If the plasmid is methylated, it undergoes a single round of replication, and then the hemimethylated products accumulate.

Suggesting that a hemimethylated origin cannot be used to initiate a replication cycle.

TLS Online TPP Program

#Id: 7612

#Unit 5. Developmental Biology

A second slow block to polyspermy comes from the so-called zinc spark, the release of billions of zinc ions that is induced by the entry of the first sperm These released zinc ions are bind to the zona pellucida

TLS Online TPP Program

#Id: 7736

#Unit 1. Molecules and their Interaction Relevant to Biology

The number of neutrons is equal to the difference between the mass number of the atom (M) and the atomic number (Z).

TLS Online TPP Program

#Id: 6143

#Unit 3. Fundamental Processes

Cleavages are made on either side of the lesion by endonucleases encoded by the XPG and XPF genes. XPG is related to an endonuclease called FEN1 that cleaves DNA during the base excision repair pathway

TLS Online TPP Program

#Id: 7973

#Unit 10. Ecological Principles

Plant cell walls restrict the extent to which cells can expand, hence the pressure on the cell wall increases as more water enters the cell.