Biology

DNA and Genetics

1,095 Questions

DNA and genetics questions explore molecular biology, DNA replication, and genetic engineering techniques. These topics are essential for various competitive exams requiring a strong foundation in life sciences. Practice these questions to understand complex biological processes thoroughly.

DNA replication mechanismsGenetic engineering techniquesGene editing toolsPolymerase chain reactionDNA sequencing methods

DNA and Genetics Questions

Multiple choice

Which operon was first noticed in bacteria E.coli ?

  1. Lac operon

  2. Trp operon

  3. Lac repressor

  4. Gal operon
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

This operon is found in many bacteria, but was first noticed in Escherichia coli. It is regulated so that when tryptophan is present in the environment, it is not used.

Multiple choice

OCT, XAM and CAM are

  1. plasmids used in DNA probe

  2. plasmids helpful in bioremediation

  3. plasmids used to produce disease-resistant plants

  4. plasmids to promote conjugation

  5. none of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

OCT, XAM and CAM are plasmids seen in Pseudomonas putida as anti-pollutants.

Multiple choice

Shotgun technique is employed in

  1. stitching of genes

  2. isolation of genes

  3. sequencing of DNA

  4. insertion of genomic clones into a vector
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Shotgun technique is employed in insertion of genomic clones into a vector. 

Multiple choice

PCR based markers have been developed to

  1. create terminate codon

  2. manufacture antibiotics

  3. differentiate different biotypes of gall midge

  4. obtain soil microorganisms with the help of specific enzyme reductase
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Polymerase chain reaction (PCR) based markers have been developed to differentiate different biotypes of gall midge.

Multiple choice

Agrobacterium tumefaciens has

  1. Nif - plasmid

  2. R - plasmid

  3. Ti - plasmid

  4. F - plasmid
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

 Ti-plasmid induces tumor formation in plants.

Multiple choice

Teminism is a phenomenon which refers to

  1. mutual activity of operator and promoter genes

  2. central biological dogma

  3. reverse transcription

  4. transduction in bacteria
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

 Reverse transcription is the formation of DNA from RNA by enzyme reverse transcriptase. This phenomenon was discovered by ‘Tamin and Baltimone’ and thus, known as ‘Teminism’.

Multiple choice

Which of the following represents the correct order of enzymes participating in DNA replication?

  1. Primase - Helicase - ssBP - Polymerase

  2. Primase - ssBP - Helicase - Polymerase

  3. Helicase - ssBP - Primase - Polymerase

  4. Helicase - Primase - ssBP - Polymerase
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

DNA replication starts when helicase unzips DNA helix.............ssBP stabilises the unwound strands..............primase synthesises RNA primer...........and then, polymerase carries out the synthesis.