18070.The sections of a structural gene that are expressed are the ______.
Interferons
Neurons
Introns
Exons
18071.Which one of the following techniques made it possible to genetically engineer living organisms?
Heavier isotope labelling
Hybridization
Recombinant DNA techniques
X-ray diffraction
18072.The genetic material of Rabies virus is
Double stranded RNA
Single stranded RNA
Double stranded DNA
ssDNA
18073.The sequence of structural gene in lac operon concept is
lac Y, lac Z, lac A
lac Z, lac Y, lac A
lac A, lac Y, lac Z
lac A, lac Z, lac Y
18074.Production of a human protein in bacteria by genetic engineering is possible because
Bacterial cell can carry out the RNA splicing reactions
The mechanism of gene regulation is identical in humans and bacteria
The human chromosome can replicate in bacterial cell
The genetic code is universal
18075.
Select the two correct statements out of the four (a–d) given below about lac operon.
(a) Glucose or galactose may bind with the repressor and inactivate it
(b) In the absence of lactose the repressor binds with the operator region
(c) The z-gene codes for permease
(d) This was elucidated by Francois Jacob and Jacque Monod
The correct statement are
(a) and (b)
(b) and (c)
(a) and (c)
(b) and (d)
18076.During transcription, RNA polymerase holoenzyme binds to a gene promoter and assumes a saddle-like structure. What is its DNA-binding sequence?
TATA
TTAA
AATT
CACC
18077.The anti-parallel nature of DNA refers to
Its charged phosphate groups
The formation of hydrogen bonds between bases from opposite strands
The opposite direction of the two strands
The pairing of bases on one strand with bases on the other strand
18078.During transcription, if the nucleotide sequence of the DNA strand that is being coded is ATACG, then the nucleotide sequence in the mRNA would be
TCTGG
UAUGC
UATGC
TATGC
18079.Which one of the following pairs is correctly matched with regard to the codon and the amino acid coded by it?
UUA-Valine
AAA-Lysine
AUG-Cysteine
CCC-Alanine
18080.Which one of the following is not a part of a transcription unit in DNA?
A promoter
The structural gene
The inducer
A terminator
18081.According to the lac-operon concept, which functional unit of the bacterial gene material is responsible for suppressing the activity of the operator gene in the absence of lactose?
Promoter gene
Repressor protein
Regulator gene
Structural gene
18082.In the DNA molecule:
The proportion of Adenine in relation to thymine varies with the organism
There are two strands which run parallel in the 5′ → 3′ direction
There are two strands which run antiparallel-one in 5′ → 3′ direction and other in 3′ → 5′
The total amount of purine nucleotides and pyrimidine nucleotides is not always equal
18083.In a DNA strand the nucleotides are held together by:
Peptide bonds
Phosphodiester bonds
Glycosidic bonds
Hydrogen bonds
18084.The reaction, Amino acid + ATP → Aminoacyl-AMP + P–P depicts
Amino acid assimilation
Amino acid transformation
Amino acid activation
Amino acid translocation
18085.DNA has equal number of adenine and thymine residues (A = T) and equal number of guanine and cytosine (G = C). These relationships are known as
Chargaff's rule
Coulomb's law
Le-Chatelier's principle
Van't Hoff plot
18086.Signaling between cells usually results in the activation of protein
Lipases
Kinases
Proteases
Nucleases
18087.Enzyme responsible for reverse transcription is :
Reverse transcriptase
DNA polymerase
RNA polymerase
RNA dependent RNA polymerase
18088.Balbiani rings are the sites of
DNA replication
RNA and protein synthesis
Synthesis of lipids
Synthesis of polysaccharides
18089.There are 64 codons in the genetic dictionary as
There are 64 amino acids to be coded
Genetic code has a triplet nature
There are 3 nonsense codons and 61 sense codons
There are 64 different types of t-RNA