TyrRS distinguishes between tyrosine and phenylalanine through hydrogen bonding with tyrosine’s OH group. Since no other amino acid resembles tyrosine, the enzyme can do without an editing function.

TLS Online TPP Program

#Id: 4320

#Unit 11. Evolution and Behavior

When the roof leaked and the grain molded, mice appeared. Jan Baptista van Helmont, a seventeenth century Flemish scientist, proposed that mice could arise from rags and wheat kernels left in an open container for 3 weeks. 

TLS Online TPP Program

#Id: 2038

#Unit 8. Inheritance Biology

Prophage - Phage genome that is integrated into a bacterial chromosome.

TLS Online TPP Program

#Id: 7228

#Unit 5. Developmental Biology

Superantigens

Viral or bacterial proteins that bind simultaneously to the Vβ domain of a T-cell receptor and to the α chain of a Class II MHC molecule

TLS Online TPP Program

#Id: 6632

#Unit 8. Inheritance Biology

TLS Online TPP Program

#Id: 7378

#Unit 5. Developmental Biology

Par-1 protein organizes microtubules specifically with their minus and plus ends at the anterior and posterior ends of the oocyte, respectively