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

#Question id: 10599

#Unit 10. Ecological Principles

In a type I survivorship curve characterized by:

#Question id: 10600

#Unit 10. Ecological Principles

Which of the following is not feature of Type II survivorship curve?

#Question id: 10601

#Unit 10. Ecological Principles

following some statement are given about Grime’s triangle that is alternative to r and K selection is correct?

A. Ruderals are adapted to take advantage of habitat disturbance, but these are less competitor 

B. Any species cannot be a good stress tolerator and a good competitor at the same time

C. Mangroves and lichens are good stress tolerant and also good adopted to disturbance

D. Many perennial herbs are good adapted to habitat disturbance, but these are less competitor 

Which one of the following options represents a combination of correct statements?

#Question id: 10602

#Unit 10. Ecological Principles

What are size of female population of butterfly (Breed once and one year life span ) after two year ?

Nt = 20 (initial population ) Nt+2 =?

Ro=1.5 number of female produced per female per generation

#Question id: 10603

#Unit 10. Ecological Principles

The population size of a bird increased from 600 to 700 in one year. If the per capita birth rate of this population is 0.50, what is its per capita death rate?

#Question id: 10604

#Unit 10. Ecological Principles

Which of the following statement are incorrect?