Chemotaxis of Dictyostelium myxamoebae is a result of spiral waves of cAMP.

TLS Online TPP Program

#Id: 3988

#Unit 2. Cellular Organization

By maintaining the unbound DNA in a relaxed state, topoisomerases facilitate the binding of histones to the DNA and the formation of additional nucleosomes.

Importantly, the overall effect on the plasmid is that the linking number is decreased as more nucleosomes are assembled

TLS Online TPP Program

#Id: 9286

#Unit 6. System Physiology – Plant

Plant glutamine synthetase (GS) and NADH‐dependent glutamate synthase (NADH‐GOGAT) are responsible for the initial massimilation of ammonia into organic compounds

TLS Online TPP Program

#Id: 813

#Unit 3. Fundamental Processes

A consensus sequence is, in each case a version of the sequence having at each position the nucleotide (or amino acid) most commonly found. consensus sequence was derived by aligning 300 sequences known to function as s70 promoters and ascertaining the most common base found at each position in the –35 and –10 hexamers.

TLS Online TPP Program

#Id: 5946

#Unit 10. Ecological Principles

Deserts are not very efficient at converting huge amounts of incident energy from sunlight into plant biomass.  Most ecosystems based on phytoplankton have very low efficiencies, usually less than 0.5%.

Photosynthetic efficiency of an ecosystem as a whole varies between 1% and 2%.

TLS Online TPP Program

#Id: 2406

#Unit 3. Fundamental Processes

RNA polymerase performs two proofreading functions on that growing transcript

pyrophosphorolytic editing

hydrolytic editing