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English I
Physics
Chemistry
Biology
Mathematics
English II
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Question-1
Tobacco mosiaic virus is a tubular filament of size
(A)
700 x 30 nm
(B)
300 x 10 nm
(C)
300 x 5 nm
(D)
300 x 18 nm
Question-2
Thermococcus, Methanococcus
and
Methanobacterium
exemplify
(A)
archaebacteria that contain protein homologous to eukaryotic core histones
(B)
archaebacteria that lack any histones resembling those found in eukaryotes but whose DNA is negatively supercoiled
(C)
bacteria whose DNA is relaxed or positively supercoiled but which have a cytoskeleton as well as mitochondria.
(D)
bacteria that contain a cytoskeleton and ribosomes
Question-3
The most thoroughly studied of the known bacteria-plant interactions is the
(A)
cyanobacterial symbiosis with some aquatic ferns
(B)
gall formation on certain angiosperms by
Agrobacterium
(C)
nodulation of
Sesbania
stems by nitrogen fixing bacteria.
(D)
plant growth stimulation by phosphate solublising bacteria
Question-4
Viruses that infect bacteria, multiply and cause their lysis, are called
(A)
lysozymes
(B)
lytic
(C)
lipolytic
(D)
lysogenic
Question-5
Rickettsiae constitute a group under
(A)
bacteria
(B)
viruses
(C)
independent group between bacteria and viruses
(D)
fungi
Question-6
Which one of the following statements about mycoplasma is wrong ?
(A)
They are also called PPLO
(B)
They are pleomorphic
(C)
They are sensitive to penicillin
(D)
They cause disease in plants
Question-7
In bacteria, plasmid is
(A)
extra-chromosomal material
(B)
main DNA
(C)
non-functional DNA
(D)
repetitive gene
Question-8
The main role of bacteria in the carbon cycle involves
(A)
photosynthesis
(B)
chemosynthesis
(C)
digestion or breakdown of organic compounds
(D)
assimilation of nitrogenous compounds
Question-9
The semilog of per minute growing bacteria is plotted against time. What will be the shape of graph ?
(A)
Sigmoid
(B)
Hyperbola
(C)
Ascending straight line
(D)
Descending straight line
Question-10
Chromosomes in a bacterial cell can be 1-3 in number and
(A)
can be circular as well as linear within the same cell
(B)
are always circular
(C)
are always linear
(D)
can be either circular or linear, but never both within the same cell
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Plus 1 Biology Science
ICSE/ISC
Practice in Related Chapters
Nature and Scope of Biology
Species and Population
Common Human Diseases
Strutural Organizaton of a Cell
Classification & Morphology Of Arthropoda
Nature And Scope Of Zoology
Kingdom Fungi
Algae, Bryophytes and Ptertdophytes
Gymnosperms And Angiosperms
Movements And Locomotion
Invertebrata
Introduction To Biotechnology
Vertebreta
Tools of Biology
Kingdom Monera
Kingdom Protista
The living world
Taxonomy
Animal Kingdom
Being Alive What does it Mean?
Anatomy of Plants
Plant- Water Relations
Morphology of Flowering Plants
Taxonomy and Phylogeny
Biomolecules
Cell Division
Continuity of life
Cell Membrane
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