The crystal structure of PCNA closely resembles the E. coli b subunit: A trimer forms a ring that surrounds the DNA.  The sequence and subunit organization are different from the dimeric b2 clamp; however, the function is likely to be similar.

TLS Online TPP Program

#Id: 6612

#Unit 7. System Physiology – Animal

Secretion of progesterone during the latter half of the cycle raises the body temperature about 0.5°F

TLS Online TPP Program

#Id: 1846

#Unit 3. Fundamental Processes

Molecular genetic techniques are used to make a cDNA encoding a recombinant protein to which is fused a short sequence of amino acids called an epitope tagging.

TLS Online TPP Program

#Id: 123

#Unit 5. Developmental Biology

The head ectoderm is competent to respond to the paracrine factors made by the optic vesicles & induced to form the lens of the eye.

TLS Online TPP Program

#Id: 4689

#Unit 11. Evolution and Behavior

When the fitness interests of two individuals are different, they are in conflict.

The evolution of cooperation and conflict depends on when these kinds of behaviors are favored by natural selection.

TLS Online TPP Program

#Id: 1010

#Unit 5. Developmental Biology

In mammals, the conversion of the genital ridge into the bipotential gonad requires, among others, the Sf1, Wt1, and Lhx9 genes.