Q126
Allen
4. GENETIC CODE, TRANSLATION
MCQ
Out of 64 codons only 61 codes for the 20 different amino acids. This character of genetic code is called :-
A.
Degeneracy
B.
Non ambiguous nature
C.
Universal
D.
Overlapping
Q127
Allen
4. GENETIC CODE, TRANSLATION
MCQ
Anticodons are found in :-
A.
mRNA
B.
tRNA
C.
rRNA
D.
In all
Q128
Allen
4. GENETIC CODE, TRANSLATION
MCQ
One-gene-one enzyme hypothesis was proposed by:-
A.
Beadle and Tatum
B.
Jacob and Monod
C.
Lederberg
D.
Watson and Crick
Q129
Allen
4. GENETIC CODE, TRANSLATION
MCQ
Which of the following RNA play structural and catalytic role during translation?
A.
m-RNA
B.
t-RNA
C.
r-RNA
D.
AIl
Q130
Allen
4. GENETIC CODE, TRANSLATION
MCQ
Transfer of genetic information from a polymer of nucleotides to a polymer of amino acid is :ā
A.
Replication
B.
Transcription
C.
Translation
D.
Reverse transcription
Q131
Allen
4. GENETIC CODE, TRANSLATION
MCQ
Translation refers to the process of :ā
A.
Polymerisation of nitrogen bases
B.
Polymerisation of nucleotides
C.
Polymerisation of nucleosides
D.
Polymerisation of amino acids
Q132
Allen
5. GENE REGULATION
MCQ
Gene and cistron words are sometimes used synonymously because:-
A.
One cistron contains many genes
B.
One gene contains many cistrons
C.
One gene contains one cistron
D.
One gene contains no cistron
Q133
Allen
5. GENE REGULATION
MCQ
A gene containing multiple exons and at least one intron is termed as :-
A.
split gene
B.
operator gene
C.
synthetic gene
D.
epistatic gene
Q134
Allen
5. GENE REGULATION
MCQ
Gene which is responsible for the synthesis of a polypeptide chain is called :-
A.
Promotor gene
B.
Structural gene
C.
Regulator gene
D.
Operator gene
Q135
Allen
5. GENE REGULATION
MCQ
What does "lac" refer to, in what we call the lac operon ?
A.
Lactose
B.
Lactase
C.
Lac insect
D.
The number 1,00,000
Q136
Allen
5. GENE REGULATION
MCQ
Which of the following is not produced by E. coli in the lactose operon ?
A.
Ī²galactosidase
B.
Transacetylase
C.
Lactose dehydrogenase
D.
Lactose permease
Q137
Allen
5. GENE REGULATION
MCQ
Who explained the operon model for the first time?
A.
Francois Jacob
B.
Jacques Monod
C.
Francois Jacob and Jacques Monod
D.
Beadle & Tatum
Q138
Allen
5. GENE REGULATION
MCQ
The accessibility of promotor regions of prokaryotic DNA by RNA polymerase is in many cases regulated by the interaction of some protein with sequences termed as :ā
A.
Promoter
B.
Operator
C.
Regulator
D.
Cistron
Q139
Allen
5. GENE REGULATION
MCQ
Regulation of lac operon by repressor is referred to as :ā
A.
Positive regulation
B.
Negative regulation
C.
Both (1) and (2)
D.
None
Q140
Allen
5. GENE REGULATION
MCQ
Which is incorrect?
A.
i-gene codes for the repressor of lac operon
B.
z-gene codes for the beta-galactosidase
C.
y-gene codes for transacetylase
D.
three gene products are required for metabolism of lactose
Q141
Allen
5. GENE REGULATION
MCQ
Which is the primary step for regulation of gene expression, in eukaryotes?
A.
Transport of m-RNA from nucleus to the cytoplasm
B.
Translational level
C.
Processing level
D.
Transcriptional level
Q142
Allen
5. GENE REGULATION
MCQ
Find out the correct sequence of structural gene in lac operon :-
A.
y, a, z
B.
a, z, y
C.
z, y, a
D.
z, a y
Q143
Allen
6. MUTATION
MCQ
The concept of sudden genetic change which breeds true in an organism is visualized as ?
A.
Natural selection
B.
Inheritance of acquired characters
C.
Mutation
D.
Independent assortment
Q144
Allen
6. MUTATION
MCQ
Mutation is :-
A.
An abrupt or discontinuous change which is inherited
B.
A factor for plant growth
C.
A change which affects parents only and is never inherited
D.
A change which affects the offspring of Fā generation
Q145
Allen
6. MUTATION
MCQ
The exchange of chromosomal parts between non homologous pairs of chromosome :-
A.
Crossing over/Transduction
B.
Translocation
C.
Inversion
D.
Transition
Q146
Allen
6. MUTATION
MCQ
Which of the following can be called a mutation?
A.
The halving of the chromosome number at meiosis
B.
The doubling of the chromosome after syngamy
C.
The possession of an additional chromosome
D.
All the above
Q147
Allen
6. MUTATION
MCQ
Mutations are generally :-
A.
Dominant
B.
Recessive
C.
Codominant
D.
Incompletely dominant
Q148
Allen
6. MUTATION
MCQ
Genetic or gene mutations occur in :-
A.
DNA
B.
RNA
C.
Protein
D.
RNA & protein both
Q149
Allen
6. MUTATION
MCQ
Which of the following undergoes change in mutation?
A.
Chromosome
B.
Structure of gene
C.
Sequence of gene
D.
Any of the above
Q150
Allen
6. MUTATION
MCQ
The locus of point mutation is generally :-
A.
Gene
B.
Chromosome
C.
Centromere
D.
Nucleus