Ramachandran plots can help increase the accuracy of models derived from x-ray crystallography data. The plot below was created by measuring phi, and psi for each amino acid residue in a 2.2 A resolution crystal structure. In the plot, which excludes Gly and Pro residues, selected residues (dots) are numbered 1 through 5.

Which of the following statements can be correctly stated for this plot in reference to selected residues?

A. Residues 1 and 3 are in either B sheets

B. residue 2 is in a right-handed a helix, and residue 4 is in a left-handed a helix.

C. If residue 5 were Gly, it might be in an acceptable position in the plot

TLS Online TPP Program

#Question id: 18794

#Unit 13. Methods in Biology

Which of the following compound is rapidly phosphorylated and incorporated in its place into newly synthesized DNA and is used to detect replicating cells.

TLS Online TPP Program

#Question id: 18795

#Unit 13. Methods in Biology

Which of the following compound can be used as analogue to Propidium Iodide

TLS Online TPP Program

#Question id: 18796

#Unit 13. Methods in Biology

Newly replicating cell can be selectively killed by photolysis incorporating 

TLS Online TPP Program

#Question id: 18797

#Unit 13. Methods in Biology

A replicating cells that have incorporated a high level of BrdU are exposed to light, they will

TLS Online TPP Program

#Question id: 18798

#Unit 13. Methods in Biology

which of the is a fluorescent dye with a flat, planar structure that slides between the rungs of (or intercalates into) the DNA ladder in a quantitative manner frequently used in FACS.

TLS Online TPP Program

#Question id: 18799

#Unit 13. Methods in Biology

Propidium iodide-labeled cells can be identify cells within the populations are at each stage of the cell cycle. After passing through flow cytometer a graph is observed

  

In this graph A, B, C, and D represent a cell stage which are