TLS Online TPP Program

#Id: 6240

#Unit 8. Inheritance Biology

Reciprocal crosses

Pair of crosses in which the phenotypes of the male and female parents are reversed

 

TLS Online TPP Program

#Id: 5706

#Unit 7. System Physiology – Animal

Lactotropes -Prolactin (PRL) promotes mammary gland development and milk production.

TLS Online TPP Program

#Id: 4668

#Unit 13. Methods in Biology

If the antibody preparation is polyclonal and has a range of affinities, Scatchard plot yields a curved line whose slope is constantly changing. The average affinity constant K0 can be calculated by determining the value of Ka when half of the binding sites are occupied (i.e., when r  1 in this example). In this graph, antiserum #3 has a higher affinity (K0  2.4  108) than antiserum #4 (K0  1.25  108)

TLS Online TPP Program

#Id: 6897

#Unit 3. Fundamental Processes

HP1 is recruited to regions in which histone H3 has been methylated at lysine 9, a modification involved in heterochromatin formation. It turns out that HP1 can also interact with Dnmt1, which can promote DNA methylation in the vicinity of HP1 binding. Furthermore, Dnmt1 can directly interact with the methyltransferase responsible for H3K9 methylation, creating a positive feedback loop to ensure continued DNA and histone methylation.

TLS Online TPP Program

#Id: 10502

#Unit 4. Cell Communication and Cell Signaling

Four genes play an essential role in controlling apoptosis during C. elegans development: 

ced-3, ced-4, ced-9, and egl-1