A common feature of all active auxins is a molecular distance of about 0.5 nm between a fractional positive charge on the aromatic ring and a negatively charged carboxyl group.

TLS Online TPP Program

#Id: 3986

#Unit 2. Cellular Organization

Addition of a topoisomerase greatly facilitates nucleosome association with cccDNA.

When a topoisomerase is present during nucleosome assembly, it cannot act on the DNA bound to the nucleosome. Instead, the topoisomerase relaxes the DNA not included in nucleosomes, reducing the positive superhelical density in these regions by decreasing the linking number.

TLS Online TPP Program

#Id: 5188

#Unit 7. System Physiology – Animal

The initial reaction in the intrinsic system is conversion of inactive factor XII to active factor XII (XIIa).

TLS Online TPP Program

#Id: 9208

#Unit 11. Evolution and Behavior

CAUSES OF GENETIC DRIFT

Genetic drift in a small population over multiple generations can significantly affect the composition of a population’s gene pool. 

TLS Online TPP Program

#Id: 3648

#Unit 3. Fundamental Processes

In ValRS, the side chain of Asp 279 protrudes into the editing active site, where it hydrogen-bonds with the hydroxyl group of threonine. The isosteric (having the same shape) valine lacks this hydroxyl group and is thereby excluded from the editing pocket.

TLS Online TPP Program

#Id: 2016

#Unit 8. Inheritance Biology

Mendel drew from his monohybrid cross was that the two alleles  in each plant separate when gamete are formed, and one allele goes into each gamete.

The two alleles of an individual plant separate with equal probability into the gametes.

Independent assortment