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Biology-Prev.Year Repeated Questions
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Question-1
The lac operon is an example of
(A)
repressible operon
(B)
overlapping genes
(C)
arabinose operon
(D)
inducible operon.
Question-2
Genetic code consists of
(A)
adenine and guanine
(B)
cytosine and uracil
(C)
cytosine and guanine
(D)
all the above
Question-3
Bateson used the terms coupling and repulsion for linkage and crossing over. Name the correct parental of coupling type alongwith its cross over or repulsion
(A)
coupling AABB, aabb; Repulsion AABB, aabb
(B)
coupling AAbb, aaBB; Repulsion AaBb, aabb
(C)
coupling aaBB, aabb; Repulsion AABB, aabb
(D)
coupling AABB. aabb: Repulsion AAbb,
aaBB.
Question-4
Radio-tracer technique shows that DNA is in
(A)
multi-helix stage
(B)
single-helix stage
(C)
double-helix stage
(D)
none of these
Question-5
When a certain character is inherited only through female parent, it probably represents
(A)
multiple plastid inheritance
(B)
cytoplasmic inheritance
(C)
incomplete dominance
(D)
mendelian nuclear inheritance.
Question-6
If the DNA codons are ATG ATG ATG and a cytosine base is inserted at the beginning, then which of the following will result?
(A)
CAT GAT GATG
(B)
a non-sense mutation
(C)
C ATG ATG ATG
(D)
CA TGA TGA TG
Question-7
Which of the following reunites the exon segments after RNA splicing
(A)
RNA polymerase
(B)
RNA primase
(C)
RNA ligase
(D)
RNA proteoses
Question-8
The polytene chromosomes were discovered for the first time in
(A)
Drosophila
(B)
Musca domestica
(C)
Chironomus
(D)
Musca nebula
Question-9
In split genes, the coding sequences are called
(A)
exons
(B)
cistrons
(C)
introns
(D)
operons
Question-10
Who proved that DNA is basic genetic material?
(A)
Griffith
(B)
Watson
(C)
Boveri and Sutton
(D)
Hershey and Chase
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Plus 2 Biology Science
CBSE
Practice in Related Chapters
Plant Reproduction
Animal Tissue
Kingdom Monera
Plant Kingdom
Biological Classification
General Biology
Respiratory System
Digestive System And Nutrition
Circulatory System and Immunity
Plant Morphology
Plant Anatomy
Cell Reproduction
Human Genetics & Genetic Disorders
Mendelian & Postmendelian Genetics
Genes & Chromosomes
Biomolecules
Enzymes
Cell Respiration
Cell Respiration
Kingdom Fungi
Aging And Death
Common Human Diseases
Evolution
Drug And Addiction
Reproduction And Embryonic Development
Endocrine System
Excretion And Osmoregulation
Nervous System & Sense Organs
Musculo-Skeletal System
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