NtrC controls expression of genes involved in nitrogen metabolism by inducing a conformational change in a pre-bound RNA polymerase, triggering transition to the open complex.

I. Under low nitrogen level condition, NtrC is phosphorylated by a kinase, NtrB,

II. NtrC (bound to its sites upstream) interacts directly with s54. This requires that the DNA between the activator binding sites and the promoter form a loop to accommodate the interaction

III. Active NtrC binds four sites located approximately 150 bp upstream of the glnA gene.

IV. NtrC itself has an ATPase activity which provides the energy needed to induce a conformational change in polymerase.

Correct series of Activation by NtrC is;

TLS Online TPP Program

#Question id: 10719

#Unit 10. Ecological Principles

Five Hypotheses Explain How Species Richness Affects Community Services, Following statement are given

A) Community services decline with decreased species richness in a stepwise fashion.

B) Species that play the same roles in a community can compensate for each other if some are lost under particular conditions

C) Species richness declines even slightly from its natural levels, community services are reduced immediately

D) Community services change as the number of species increases or decreases, but that the direction of change is not predictable.

TLS Online TPP Program

#Question id: 10720

#Unit 10. Ecological Principles

What is the Jaccard index between the two communities?

TLS Online TPP Program

#Question id: 10721

#Unit 10. Ecological Principles

Which above spp having decrease order of abundance?

TLS Online TPP Program

#Question id: 10722

#Unit 10. Ecological Principles

Community 1 contains 100 individuals distributed among four species (A, B, C, and D). Community 2 contains 100 individuals distributed among three species (A, B, and C). Community 1: 5A, 5B, 85C, 5D Community 2: 30A, 40B, 30C Calculate the Shannon diversity (H) for each community.

TLS Online TPP Program

#Question id: 10723

#Unit 10. Ecological Principles

What does the graph tell you about the effect of a keystone species?

TLS Online TPP Program

#Question id: 10724

#Unit 10. Ecological Principles

This example is based on the hypothetical ( x means Present), compare species diversity within different community Which one of the

following conclusions is most appropriate based on the above observations?

A) The beta diversity between the community X and Y is 5

B) The gamma diversity for the these communities are 14

C) The beta diversity between the community X and Z is greater than Y and Z

D) Community Y has minimum Alpha diversity among community