18050.______ occurs in RNA instead of the nitrogenous base thymine found in DNA.
Uracil
Cytosine
Guanine
Ribose
18055.Match the followings:
| A | tRNA | 1 | Linking of amino acids |
| B | mRNA | 2 | Transfer of genetic information |
| C | rRNA | 3 | Nucleolar organising region |
| D | Peptidyl transferase | 4 | Transfer of amino acid from cytoplasm of ribosome |
A = 4, B = 2, C = 3, D = 1
A = 1, B = 4, C = 3, D = 2
A = 1, B = 2, C = 3, D = 4
A = 1, B = 3, C = 2, D = 4
18056.______ catalyzes the formation of RNA on a DNA template and capable of binding to a promoter.
DNA polymerase
Helicase
DNA lipase
RNA polymerase
18058.What is antisense technology?
RNA polymerase producing DNA
A cell displaying a foreign antigen used for synthesis of antigens
Production of somaclonal variants in tissue cultures
When a piece of RNA that is complementary in sequence is used to stop expression of a specific gene
18060.The site of translation (protein synthesis) is ______.
Mitochondria
Ribosomes
Nucleus
None of these
18061.Translation refers to the process of polymerisation of amino acids to form _______.
Backbone
Ribosome
Polypeptide
Single codon
18062.A phenomenon where the third base of t-RNA at its 5 end can pair with a non-complementary base of m-RNA is called
Degeneracy
Wobbling
Universality
Collinearity
18063.The region of tRNA which consists of three bases complementary to a mRNA codon is ______.
Codon
Intron
Anticodon
Interferon
18064.Removal of introns and joining the exons in a defined order in a transcription unit is called
Capping
Splicing
Tailing
Transformation
18066.DNA is made of two chains that twist about one another in the shape of a _______.
Broken ladder
Straight ladder
Straight spiral
Double helix
18068.During protein synthesis, AUG functions as the initiator codon in mRNA. What should be the anticodon on the tRNA molecule that picks up and brings the amino acid specified by this codon?
TAC
UAC
GUA
CAU
18069.What are those structures that appear as beads-on-string in the chromosomes when viewed under electron microscope?
Base pairs
Genes
Nucleotides
Nucleosomes