Biology : Molecular Basis of Inheritance

Choose the correct statement.

• Haploid content of human DNA is 4.6 × 10⁶ bp.

• A nitrogenous base is linked to pentose sugar through phosphodiester linkage

• X-ray diffraction data of Maurice Wilkins and Rosalind Franklin was the basis of Watson and Crick's DNA model

• DNA is an acidic substance was first identified by Watson and Crick

• DNA is an acidic substance was first identified by Watson and Crick

Which triplet codon does not have a tRNA associated with
it?

• UAA

• UUA

• UUU

• AUU

• AUU

In the double-helical structure of DNA, the pitch of the helix is

• 3.4 nm

• 0.34 nm

• 6.6 nm

• 34 nm

• 34 nm

Which property among these listed below is not a criteria for a molecule to act as a genetic material?

• Generate its replica

• Chemically and structurally stable

• Mutate slowly to facilitate evolution

• Express itself in the form of Mendelian characters

• Express itself in the form of Mendelian characters

Read the following statements and choose the correct option:

I. RNA polymerase associates transiently with 'Rho' factor to initiate transcription.

II. In bacteria, transcription and translation takes place in the same compartment.

III. RNA polymerase I is responsible for transcription of tRNA.

IV. When hnRNA undergoes capping process, adenlyte residues are added at 3' end in a template independent manner.

V. hRNA is the precursor of mRNA.

• II only is correct

• II, III and V only are correct

• III and IV only are correct

• I and IV only are correct

• I and IV only are correct

Physical association of genes on a chromosome is called

• Repulsion

• Linkage

• Aneuploidy

• Duplication

• Duplication

Aminoacylation of tRNA is essential for

• replication of RNA

• formation of peptide bond

• splicing

• initiation of transcription

• initiation of transcription

Match Column I with Column II and choose the correct option.

• I - B; II - E; III - A; IV - C

• I - C; II - D; III - B; IV - A

• I - B; II - D; III - C; IV - A

• I - A; II - E; III - D; IV - B

• I - A; II - E; III - D; IV - B

The moiety present at the 5' end of ribose sugar in a polynucleotide is

• OH

• CH₂

• Phosphate

• Adenine

• Adenine

In the ribose of RNA, unlike DNA, every nucleotide residue has an additional

• COOH group in the 2'position

• OH group in the 5' position

• OH group in the 2'position

• Phosphate group in the 2' position

• Phosphate group in the 2' position