Hershey and Martha conducted their experiments on ______

• Rat

• Fungus

• Bacteriophages

• Pisum sativum

Phage T₂ infects the bacterium________

• Escherichia coli

• Lactococcus lactis

• Streptococcus thermophilus

• Corynebacterium diphtheriae

Hershey and Chase designed an experiment using radioactive isotopes of______ and______.

• ²⁴Na

• ³²P

• ¹¹C

• ³⁵S

The bacteriophage that grew in the presence of ³⁵S had labelled______.

• DNA

• RNA

• Nitrogenous base pair

• Protein

The only difference between DNA and RNA is

• One oxygen more in DNA

• One oxygen atom less in RNA

• Difference not identified

• One oxygen atom less in deoxyribose

________have double carbon–nitrogen ring structures.

• Adenine

• Cytosine

• Uracil

• Thymine

• Guanine

When a phosphate group is attached to the 5' carbon of the same sugar is called_______.

• Nucleotide

• Nucleoside

• Purine

• Pyrimidine

The chemical bonds that link the sugar components of adjacent nucleotides are called

• Covalent bond

• Ionic bond

• Co ordinate covalent bond

• Phosphodiester bond

The symbol 5' refers to carbon in the sugar to which_____ functional group is attached.

• PO₄

• OH

• CO

• COOH

The X - ray diffraction analysis for the structure of DNA was done by

• Rosalind Franklin

• James Watson

• Francis Crick

• Maurice Wilkins