Biology

DNA and Genetics

985 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

Molecular glue is another name for

  1. DNA Ligase

  2. restriction enzyme

  3. DNA polymerase

  4. Topoisomerase
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Correct. it is used for joining of two DNA fragments.

Multiple choice

Chemical knives of DNA are

  1. DNA polymerase

  2. Restriction enzyme

  3. RNA synthetase

  4. Reverse transcriptase
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Correct. They make cuts at specific position on DNA fragments.

Multiple choice

………. is Molecular marker.

  1. RFLP

  2. RLP

  3. RAP

  4. RFP
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Restriction Fragment Length Polymorphism (RFLP) is a classic molecular marker technique used in genetics and biotechnology.

Multiple choice

RFLP stands for:

  1. Restriction Fragment Length Polymorphism

  2. Registered Fragment Length Polymorphism

  3. Restriction Fragment Length Problem

  4. Restriction Fragment Labour Polymorphism
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

RFLP is the standard scientific acronym for Restriction Fragment Length Polymorphism.

Multiple choice

Which of the following statements are FALSE? P. PAM matrices are based on Markov model of protein evolution. Q. SRS is a website that indexes many biological databases and is searchable by keywords. R. Sequences that share an arbitrary, threshold level of similarity determined by alignment of matching bases are termed as homologous sequences. S. The paired dot in the sequence alignment represents semi-conserved substitutions.

  1. Only P and Q

  2. Only P and R

  3. Only P and S

  4. Only Q and R

  5. Only R and S
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

It is the correct answer. Both are false. PAM matrices are based on Dayhoff model of protein evolution. The paired dot in the sequence alignment represents conserved substitutions.

Multiple choice

Function of DNA topoisomerase II is to

  1. cut the single strand of DNA

  2. cut both the strands of DNA

  3. stabilize both the strands

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

DNA topoisomerase II functions by creating a transient double-strand break in the DNA helix to allow another segment of DNA to pass through, thereby relieving supercoiling.

Multiple choice

Plasmid is a/an

  1. plastid

  2. extrachromosomal DNA

  3. starch granules

  4. fat globule
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

 A plasmid is a small DNA molecule within a cell that is physically separated from a chromosomal DNA and can replicate independently. They are most commonly found in bacteria as small circular, double-stranded DNA molecules; however, plasmids are sometimes present in archaea and eukaryotic organisms.

Multiple choice

Which of the following programs did Pearson and Lipman searched for similarity between a protein query sequence and any group of nucleotide sequences?

P. FastA Q. TFastA R. FastX S. TFastX

  1. Only P and Q

  2. Only P and S

  3. Only Q and R

  4. Only Q and S

  5. Only R and S
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Yes, it is correct. TFastA does a Pearson and Lipman search for similarity between a protein query sequence and any group of nucleotide sequences. TFastX does a Pearson and Lipman search for similarity between a protein query sequence and any group of nucleotide sequences, taking frameshifts into account.