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English I
Physics
Chemistry
Biology
Mathematics
English II
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Question-1
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-2
What is true for archaebacteria ?
(A)
All halophiles
(B)
All photosynthetic
(C)
All fossils
(D)
Oldest living beings
Question-3
Which one of the following pairs is not correctly matched ?
(A)
Streptomyces
-Antibiotic
(B)
Serratia
-Drug addiction
(C)
Spirulina
-Single cell protein
(D)
Rhizobium
-Biofertilizer
Question-4
Sex factor in bacteria is
(A)
chromosomal replicon
(B)
F-replicon
(C)
RNA
(D)
sex-pilus
Question-5
For retting of jute the fermenting microbe used is
(A)
methophilic bacteria
(B)
butyric acid bacteria
(C)
Helicobacter pylori
(D)
Streptococcus lactis
Question-6
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-7
The site of respiration in bacteria is
(A)
episome
(B)
mesosome
(C)
ribosome
(D)
microsome
Question-8
Azotobacter
and
Bacillus polymyxa
are the examples of
(A)
symbiotic nitrogen-fixers
(B)
non-symbiotic nitrogen-fixers
(C)
ammonifying bacteria
(D)
disease-causing bacteria
Question-9
Interferons are
(A)
antiviral proteins
(B)
antibacterial proteins
(C)
anticancer proteins
(D)
complex proteins
Question-10
Bacteria lack alternation of generation because there is
(A)
neither syngamy nor reduction division
(B)
distinct chromosomes are absent
(C)
no conjugation
(D)
no exchange of genetic material
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Plus 1 Biology Science
ICSE/ISC
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