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Question-1
Khorana first deciphered the triplet codons of
(A)
serine and isoleucine
(B)
cysteine and valine
(C)
tyrosine and tryptophan
(D)
phenylalanine and methinonine
Question-2
The point, at which polytene chromosome appear to be attached together, is called
(A)
centromere
(B)
chromomere
(C)
chromocentre
(D)
centriole
Question-3
A DNA with unequal nitrogen bases would most probably be
(A)
single stranded
(B)
double stranded
(C)
triple stranded
(D)
four stranded.
Question-4
Genes for cytoplasmic male sterility in plants are generally located in
(A)
chloroplast genome
(B)
mitochondrial genome
(C)
nuclear genome
(D)
cytosol
Question-5
The transforming principle of
pneumococcus
as found out by Avery, MacLeod and McCarty was
(A)
mRNA
(B)
DNA
(C)
protein
(D)
polysaccharide.
Question-6
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-7
A family of five daughter only is expecting sixth issue. The chance of its beings a son is
(A)
Zero
(B)
25%
(C)
50%
(D)
100%.
Question-8
Experimental material in the study of DNA replication has been
(A)
Escherichia coli
(B)
Neurospora crassa
(C)
Pneumococcus
(D)
Drosophila melanogaster.
Question-9
Sex is determined in human beings
(A)
by ovum
(B)
at time of fertilization
(C)
40 days after fertilization
(D)
seventh to eight week when genitals differentiate in foetus
Question-10
In Drosophila the XXY condition leads to femaleness whereas in human beings the same condition leads to Klienfelter’s syndrome in male. It proves
(A)
in human beings Y chromosme is active in sex determination
(B)
Y chromosome is active in sex determination in both human beings and Drosophila
(C)
in Drosophila Y chromosome decides femaleness
(D)
Y chromosome of man have genes for syndrome
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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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