In clover leaf model of $$tRNA$$ , $$\psi $$ present in $$T\psi C$$  loop represents

The enzyme which synthesize RNA primer for DNA synthesis is

A. DNA primase

B. Primase

C. Primer synthase

D. All of the above

The role of guide RNA (gRNA) is recognized in

A. RNA editing

B. Antisense RNA

C. RNA splicing

D. All of the above

The form or conformation of DNA double helix which is prevalent in vivo is

A. B-DNA

B. A-DNA

C. Z-DNA

D. All of the above

The sugar residues are covalently joined by

A. 5' → 3' phosphodiester bonds

B. H₂ bonds

C. Phosphorylated ions

D. Covalent bonds