Conversion of a proto-oncogene into an oncogene, also called activation, generally involves a gain-of-function mutation. Following statements are regarding to the mechanisms that produce oncogenes from the corresponding proto-oncogenes.

A. A change in a single base pair in a proto-oncogene that results in a hyperactive or constitutively active protein product.

B. A chromosomal translocation that fuses two genes together to produce a hybrid gene encoding a chimeric protein whose activity, unlike that of the parent proteins, is permanently suppress.

C. A chromosomal translocation that brings a growth regulatory gene under the control of alternative enhancers that cause inappropriate expression of the gene.

D. Amplification of a DNA segment including a proto-oncogene so that numerous copies exist, leading to overproduction of the encoded protein.

Which of the following statements are correct?

TLS Online TPP Program

#Question id: 11443

#Unit 10. Ecological Principles

To qualify as a Biodiversity Hotspot, an area must contain__:

A .At least 1,500 species of endemic vascular plants

B .At least 70 percent land covered by vascular plants

C .At least 25 threatened species of mammals

D .At least one protected area such as national park

 Choose the correct option from the codes given below:

TLS Online TPP Program

#Question id: 11444

#Unit 10. Ecological Principles

Ecologist have proposed following explanation to lead maximize biodiversity at tropic.

A. Higher productivity in the tropics allows for more species present

 B. Old communities have greater species than younger community

 C. Natural enemies such as predators and parasite limit competition in the tropics, which allows more species to coexist

D. Very less intensity of disturbances in the tropics promote high succession diversity

TLS Online TPP Program

#Question id: 12586

#Unit 10. Ecological Principles

A biome with dry and rainy seasons, trees in patches, and ground cover of tropical bunchgrass is called a

TLS Online TPP Program

#Question id: 12587

#Unit 10. Ecological Principles

The most plausible  hypothesis to  explain why  species richness is  higher in  tropical  than in  temperate regions is that

TLS Online TPP Program

#Question id: 12588

#Unit 10. Ecological Principles

According to the equilibrium model of island biogeography, species richness would be greatest on an island that is

TLS Online TPP Program

#Question id: 12589

#Unit 10. Ecological Principles

Which of these ecosystems has the highest net primary productivity per square meter?