XII - ZOO - CH - 5 - Genetic code

Removal of RNA polymerase-III from nucleoplasm will affect the synthesis of

• (a) tRNA

• (b) hnRNA

• (c) mRNA

• (d) rRNA

Which one of the following is not a part of a transcription unit in DNA?

• (a) The inducer

• (b) A terminator

• (c) A promoter

• (d) The structural gene

In eukaryotic cells the Ribosomal RNA is actively synthesised in

• (a) lysosomes

• (b) nucleolus

• (c) Cytoplasm

• (d) ribosomes

Removal of introns and joining of exons in a defined order during transcription is called

• (a) looping

• (b) inducing

• (c) slicing

• (d) splicing

What are the structures called that give an appearance as ‘beads on string’ in the chromosomes when viewed under electron microscope?

• (a) Genes

• (b) Nucleotides

• (c) Nucleosomes

• (d) Base pairs

Whose experiments cracked the DNA and discovered unequivocally that a genetic code is a triplet?

• (a) Nirenberg and Matthaei

• (b) Hershey and Chase

• (c) Morgan and Sturtevant

• (d) Beadle and Tatum

In split genes, the coding sequence are called

• (a) introns

• (b) operons

• (c) exons

• (d) cistrons

Which of the following features of genetic code does allow bacteria to produce human insulin by recombinant DNA technology?

• (a) Genetic code is redundant

• (b) Genetic code is nearly universal

• (c) Genetic code is specific

• (d) Genetic code is not ambiguous

Which one of the following is the starter codon?

• (a) UGA

• (b) UAA

• (c) UAG

• (d) AUG

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

• (a) 64

• (b) 60

• (c) 20

• (d) 61