TLS Online TPP Program

#Question id: 2887


Which of the following reasons has led to the evolutionary selection of an extra methyl group in DNA?

#Unit 2. Cellular Organization
  1. Thymine is more stable than Uracil due to the absence of an extra methyl group attached to the 5’ position.

  2. Cytosine undergoes spontaneous deamination to yield Uracil, which repair enzymes cannot recognize as foreign to DNA.

  3. If the genetic material contained uracil, then uracil arising from cytosine deamination would go undetected by the surveillance systems that maintain the genome.

  4. Uracil has greater resistance to photochemical mutation, making the genetic material more stable.

More Questions
TLS Online TPP Program

#Question id: 10682

#Unit 10. Ecological Principles

if 30 individuals of species 2 take up the same amount of resources as 5 individual of species 1 then the per capita competitive effects on species 1 of species 2 is

TLS Online TPP Program

#Question id: 10683

#Unit 10. Ecological Principles

Which of the following interaction shown in figure

TLS Online TPP Program

#Question id: 10684

#Unit 10. Ecological Principles

Which one of the following statements is INCORRECT?

TLS Online TPP Program

#Question id: 10685

#Unit 10. Ecological Principles

figure show population growth in two species A ana B . Interaction between


 

TLS Online TPP Program

#Question id: 10686

#Unit 10. Ecological Principles

 Following figure are shown figure of predator prey model 


Following some observation are given

A) The number of prey, N, increase at low predator densities, P, and decrease at high predator densities

B) Prey zero isoclines is depends on the ratio of the growth rate of prey to the capture efficiency of the predators

C) Number of predator needed for prey isoclines is depends on the ratio of the death rate of predators to the conversion efficiency of predators

D) Number of predator for prey isoclines depends on the ratio of the death rate of prey to the conversion efficiency of predators

Which of the above observation are true?


TLS Online TPP Program

#Question id: 10687

#Unit 10. Ecological Principles

V(t) and E(t) are, respectively, prey density and predator density at time t. The densities have dynamics


What will the positive equilibrium densities of both predator and pray at isocline