Clinically, the cell wall is important because it contributes to the ability of some species to cause disease and is the site of action of some antibiotics. In addition, the chemical composition of the cell wall is used 

#Question id: 19467

#Unit 13. Methods in Biology

#Question id: 3988

#Unit 3. Fundamental Processes

The tryptophan operon of E. coli is repressed by tryptophan added to the growth medium.  The tryptophan repressor probably:

#Question id: 3699

#Unit 3. Fundamental Processes

In this diagram of the process of DNA replication at a replication fork, the black boxes labeled D and E are:

#Question id: 32381

#Unit 2. Cellular Organization

#Question id: 1256

#Unit 4. Cell Communication and Cell Signaling

Scaffolds for MAP kinase pathways are well documented in yeast, fly, and worm cells, but their presence in mammalian cells has been difficult to demonstrate. Perhaps the best documented scaffold protein in metazoans is Ksr (kinase suppressor of Ras).

A. Ksr functions as a molecular scaffold by binding several signaling components of the MAP kinase cascade, including both MEK and MAP kinase; and thus can enhance MAP kinase activation by regulating the efficiency of these interactions.

B. Ksr function as a protein kinase which constitutive activate RTK signalling pathway.

C. Ksr function as a receptor proteins which inhibits RTK signalling pathway.

D. Ksr function as a protein phosphatase which inhibits RTK signalling pathway.

Which of the following statement is correct about Ksr?