Task: Class Definition Understanding (ontology: Sciences/Biology)

Which of the following definitions best describes 'obsolete guanine, xanthine and their nucleoside salvage'?

A. OBSOLETE. The pathway by which guanine, xanthine and their nucleoside from purine nucleotides breakdown are converted back to purine nucleotides. The pathway is important in cells where there is no de-novo purine nucleotides biosynthesis.
B. OBSOLETE. The trans-bilayer migration of phospholipids accelerated by a phospholipid scramblase upon binding calcium ions.
C. OBSOLETE. Any process, either active or passive, by which an organism avoids the effects of the symbiont organism's immune response. The symbiont is defined as the smaller of the organisms involved in a symbiotic interaction.
D. OBSOLETE. Any process that activates or increases the frequency, rate or extent of invadopodium assembly.

Answer: OBSOLETE. The pathway by which guanine, xanthine and their nucleoside from purine nucleotides breakdown are converted back to purine nucleotides. The pathway is important in cells where there is no de-novo purine nucleotides biosynthesis.