XII - ZOO - CH - 5 - Chemistry of Nucleic Acid

Monomer of nucleic acids are

• A) Peptides

• B) Nucleosides

• C) Nucleotides

• D) None of these

DNA and RNA are types of

• A) Nucleotides

• B) Nucleosides

• C) Nucleic acids

• D) Nucleamides

A nucleotides contains

• A) Hexose sugar + nitrogenous base + phosphate group

• B) Pentose sugar + nitrogenous base + phosphate group

• C) Hexose sugar + nitrogenous base + sulphate group

• D) Pentose sugar + nitrogenous base + sulphate group

Which of these is a purine

• A) Cytosine

• B) Adenine

• C) Thiamine

• D) More than one is correct

Which of these is a pyrimidine

• A) Adenine

• B) Thymine

• C) Guanine

• D) None of these

Nitrogenous base is linked to which carbon of pentose sugar

• A) 1’C

• B) 2’C

• C) 3’C

• D) 5’C

Nitrogenous base is linked to pentose sugar by which bond

• A) N – Glycosidic bond

• B) Phosphoester bond

• C) Phosphodiester bond

• D) Peptide bond

Phosphate group is linked to which carbon of pentose sugar

• A) 1’C

• B) 2’C

• C) 3’C

• D) 5’C

Backbone of polynucleotide chain is formed due to

• A) Sugar and N-base

• B) Sugar and phosphate

• C) Phosphate and N – Base

• D) All of these

Name of DNA as ‘Nuclein’ was given by

• A) Francis crick

• B) Erwin Chargaff

• C) Friedrich Meischer

• D) Rosalind Franklin