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

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#Question id: 29081

#Unit 10. Ecological Principles

If a predator has multiple prey, abundance of prey are not strongly positively correlated then as one prey species, which of the following graph correctly represent this prediction;

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#Question id: 23212

#Unit 13. Methods in Biology

Below are given few examples of microscopy.

1. Scanning electron microscope

2. Transmission electron microscope

3. Cryoelectron microscope

4. Phase-contrast microscope

Out of the following which microscope can be used in unstained live cell imaging?

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#Question id: 14507

#Unit 13. Methods in Biology

For a biased die the probabilities for different faces to turn up are given below.

The die is tossed and you are told that either face 1 or face 2 has turned up. The probability that it is face 1 is

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#Question id: 8942

#Unit 9. Diversity of Life Forms

Which group contains diploblastic organisms?

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#Question id: 4418

#Unit 3. Fundamental Processes

Histones in repressed regions near telomeres and at the silent mating loci are hypoacetylated, confirmed by using