XII - CH - 5 - DNA is Genetic Material

Pitch of helix in double helix DNA is

• A) 3.6 nm

• B) 3.4 nm

• C) 3.2 nm

• D) 3.8 nm

Histones are

• A) Positive and acidic in eukaryotes

• B) Negative and acidic in prokaryotes

• C) Positive and basic in eukaryotes

• D) Positive and basic in prokaryotes

Histones are organized into

• A) Hexamer

• B) Octamer

• C) Tetramer

• D) Dimer

A typical nucleosome contain _____ bp of DNA has

• A) 200

• B) 400

• C) 600

• D) 800

The experiment of Griffith was performed in

• A) Diplococcus pneumoniae, bacteria

• B) Haemophilus influenzas, fungi

• C) Streptococcus pneumoniae, bacteria

• D) None of these

Which strain of the microbe used Griffith is virulent

• A) S - strain

• B) R - strain

• C) Both

• D) None

Griffith observed that the mice died surprisingly the following combination of strains was used, which was unusual

• A) S - strain heat killed

• B) Heat killed S - strain

• C) Heat killed R - strain + Live S - strain

• D) Heat killed S - strain + Live R - strain

in Avery etal., Experiment, which enzyme inhibited the transformation

• A) Protease

• B) RNA ase

• C) DNA ase

• D) All

The bacteria involved in Hershey & chase experiment of 1952 was

• A) Bacteriophage

• B) E. coli

• C) S. pneumoniae

• D) C. butyliwm

Bacteria infected with virus that showed radioactivity had

• A) radioactive DNA (S₃₂)

• B) radioactive DNA (S₃₅)

• C) radioactive DNA (P₃₂)

• D) radioactive DNA (P₃₅)