381.

Which of the following codons does not select any amino acid?

• UAG

• UAA

• UGA

• All of these

Operator genes are controls to which gene mechanism?

• Structural gene

• Activator gene

• Regulator gene

• Modulac gene

DNA is specific because it has

• number of nucleotides

• specific nature of phosphate and sugar

• arrangement of protein in DNA

• specific nature of purine and pyrimidines

Role of carbohydrate in protoplasm

• as catalyst

• for energy

• as enzymes

• for synthesis

The RNA found in eukaryotic ribosomes are

• 5 S and 16 S RNA

• 5 S, 16 S, 18 S RNA

• 23S, 16 S, RNA

• 5 S and 28 S RNA

Which one of the following codons codes for the some information as UGC?

• UGU

• UGA

• UAG

• UGG

During translation initiation in prokaryotes, a GTP molecule is needed in

• association of 30S, mRNA with formyl-met-tRNA

• association of 50S subunit of ribosome with initiation complex

• formation of formyl-met-tRNA

• binding of 30S subunit of ribosome with mRNA

In the genetic code dictionary, how many codons are used to code for all the 20 essential amino acids?

• 61

• 60

• 20

• 64

Ribosomal RNA (rRNA) is synthesized in

• nucleolus

• nucleosome

• cytoplasm

• ribosome

The number of RNA molecules in 60S sub- particles of 80S ribosomes are

• five 

• four

• three

• two