DNA

A five-carbon sugar in a ring form?

• nitrogenous base

• Deoxyribose sugar

• Phosphate group

single ringed structure (cytosine and thymine)?

• Pyrimidines

• Purines

• All the above

Cytosine and Thymine are present in?

• RNA

• PRA

• DNA

G in one chain always pairs with C in the other chain with?

• Two hydrogen Bonds

• Three Hydrogen Bonds

• Five Hydrogen Bonds

DNA Replication is termed as?

• semiconservative

• conservative

is a change in the genetic material of an individual?

• Mutation

• Genetic

• XY

• Y

The nitrogenous base is linked to position (1) on the pentose ring by a?

• glycosidic bond

• Nucleoside

• both

A=23

T=?

• 32

• 46

• 77

• 23

new DNA helix contains ?

• one old and one new chain

• one old and one old chain

• one new and one new chain

The difference between Ribose & Deoxyribose sugar lies in the

absence/presence of the?

• CH group

• OH group

• Both