TLS Online TPP Program

#Question id: 3351


In pre-industrial period in England, most peppered moths had light coloration. During industrial revolution, many lichens died out and trees became blackened by soot from factories and interestingly, dark colored moths were predominantly seen. Which of the following observation is incorrect about above selection?

#Section 3: Genetics, Cellular and Molecular Biology
  1. It is a directional or progressive selection

  2. Industrial melanism is an adaptation where the moths living in the industrial areas developed melanin pigment to hide themselves from their predators

  3. This happened due to natural selection of the camouflaging mechanism or the moths.

  4. It reduces the variations and maintains the mean value in a population, thereby preventing the evolutionary change

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TLS Online TPP Program

#Question id: 3681

#Section 3: Genetics, Cellular and Molecular Biology

 A mutated E. coli cell carries out and completes DNA replication, but the lagging strands are found to contain more errors than normal. These errors are not found evenly distributed throughout the lagging strands, but are found in clusters. Which enzymatic activity is missing from this cell?

TLS Online TPP Program

#Question id: 3682

#Section 3: Genetics, Cellular and Molecular Biology

A mutated strain of E. coli replicates DNA normally at 25°C, but replication stops immediately when the temperature is raised to 37°C. Which protein is likely to be non-functional at the higher temperature?

TLS Online TPP Program

#Question id: 3683

#Section 3: Genetics, Cellular and Molecular Biology

In some viruses, RNA serves as the storage of genetic materials and DNA is synthesized from RNA by the enzyme known as:

TLS Online TPP Program

#Question id: 3684

#Section 3: Genetics, Cellular and Molecular Biology

Which of the followings are the characteristic feature of DNA replication?

TLS Online TPP Program

#Question id: 3685

#Section 3: Genetics, Cellular and Molecular Biology

In prokaryotes, DNA replication begins at a single site that is rich in AT nucleotide sequence, where two strands unwind and separate. This ATP dependent process catalyzed by a protein

TLS Online TPP Program

#Question id: 3686

#Section 3: Genetics, Cellular and Molecular Biology

The short strand of ........ primer is required for the replication of DNA: