Tag: molecular biology

Questions Related to molecular biology

If $H-bonds$ in double stronded $DNA$ is $350$. The ratio of $A$ and $G$ is $4:3$. The total no. of nucleotides and length of $DNA$.

structure of dna and rna nucleic acids and polynucleotides nucleic acids and protein synthesis molecular biology biology

  1. $600$ and $1020 A^o$

  2. $700$ and $1190A^o$

  3. $800$ and $ 1700 A^o$

  4. $750$ and $680 A^o$

Show answer
Correct Option: A

In which stage the DNA is doubled?

structure of dna and rna nucleic acids and polynucleotides nucleic acids and protein synthesis molecular biology biology

  1. Metaphase

  2. Anaphase

  3. Interphase

  4. Prophase

Show answer
Correct Option: A

In double helix of DNA, the two DNA strands are?

structure of dna and rna nucleic acids and polynucleotides nucleic acids and protein synthesis molecular biology biology

  1. Coiled around a common axis

  2. Coiled around each other

  3. Coiled differently

  4. Coiled over protein sheath

Show answer
Correct Option: A

The two strands of DNA are?

structure of dna and rna nucleic acids and polynucleotides nucleic acids and protein synthesis molecular biology biology

  1. Similar in nature and complementary

  2. Anti parallel and complementary

  3. Parallel and complementary

  4. Basically different in nature

Show answer
Correct Option: A

Suppose two species A and B share 94% of their DNA with each other and species C shares 75% of DNA sequence with and B. What inference can be drawn from it ?

structure of dna and rna nucleic acids and polynucleotides nucleic acids and protein synthesis molecular biology biology

  1. Species A and B share more recent common ancestor with each other than either shares with C.

  2. Species C evolved more recently than species A and B.

  3. Species C is more closely related to species B than to species A.

  4. Species A and B have common ancestor but neither have common ancestor with species C.

Show answer
Correct Option: A

In a given $100$ bp DNA segment the number of nucleotide of guanine is $20$. The total number of hydrogen bonds stabilizing this double helix are?

structure of dna and rna nucleic acids and polynucleotides nucleic acids and protein synthesis molecular biology biology

  1. $130$

  2. $120$

  3. $220$

  4. $300$

Show answer
Correct Option: A

On which strand of DNA, m-RNA is constructed?

structure of dna and rna nucleic acids and polynucleotides nucleic acids and protein synthesis molecular biology biology

  1. Trand oriented as $5' \rightarrow 3'$

  2. Strand oriented as $3' \rightarrow 5'$

  3. Both the strands

  4. Any one strand

Show answer
Correct Option: A

ADP ATP ADP system was found by Lipmann in

structure of dna and rna nucleic acids and polynucleotides nucleic acids and protein synthesis molecular biology biology

  1. 1940

  2. 1950

  3. 1960

  4. 1970

Show answer
Correct Option: A

In polypeptide synthesis, amino acids are brought over ribosome-mRNA complex by

structure of dna and rna nucleic acids and polynucleotides nucleic acids and protein synthesis molecular biology biology

  1. rRNA

  2. tRNA

  3. DNA

  4. Nucleotides

Show answer
Correct Option: B

Anticodon is made of

structure of dna and rna nucleic acids and polynucleotides nucleic acids and protein synthesis molecular biology biology

  1. Three adjacent nitrogen bases

  2. Unpaired triplet bases on mRNA

  3. Paired triplet of nitrogen bases on tRNA

  4. Unpaired triplet of nitrogen bases at one end of tRNA

Show answer
Correct Option: D