Bacteria Morphology
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The
cooci which mostly occur in single or pairs are____________.
a.
Streptococci
b. Diplococci
c.
Tetracocci
d.
None of these
Flagella
move the cell by____________.
a.
many flagella beating in a synchronous, whip-like motion
b.
an individual flagellum beating in a whip-like motion
c. spinning like a
propeller
d.
attaching to nearby particles and contracting
Bacteria
having no flagella are unable to____________.
a. move
b.
reproduce
c.
stick to tissue surfaces
d.
grow in nutrient agar
The
protein from which hook and filaments of flagella are composed of is____________.
a.
keratin
b. flagellin
c.
gelatin
d.
casein
Which
of the following may contain fimbriae?
a.
Gram-positive bacteria
b. Gram-negative
bacteria
c.
Both (a) and (b)
d.
None of these
A
cluster of polar flagella is called____________.
a. lophotrichous
b.
amphitrichous
c.
monotrichous
d.
petritrichous
Peptidoglycan
accounts for __________of the dry weight of cell wall in many gram positive
bacteria
a. 50% or more
b.
About 10%
c.
11%+ 0.22%
d.
About 20%
Which
of the following is true about cell wall of gram-positive bacteria?
a.
It consists of multiple layers
b.
It is thicker than that associated with gram-negative bacteria
c.
It contains teichoic acids
d. All of these
The
cell walls of many gram positive bacteria can be easily destroyed by the enzyme
known as____________.
a.
lipase
b. lysozyme
c.
pectinase
d.
peroxidase
Which
of the following bacteria lack a cell wall and are therefore resistant to
penicillin?
a.
Cyanobacteria
b. Mycoplasmas
c.
Bdellovibrios
d.
Spirochetes
The
cell wall of____________.
a. gram-positive
bacteria are thicker than gram-negative bacteria
b.
gram-negative bacteria are thicker than gram-positive bacteria
c.
both have same thickness but composition is different
d.
none of these
Genetic
system is located in the prokaryotes in____________.
a.
nucleoid
b.
chromatin
c.
nuclear material
d. all of these
Which
is most likely to be exposed on the surface of a gram-negative bacterium?
a. Pore protein
(porin)
b.
Protein involved in energy generation
c.
Lipoteichoic acid
d.
Phospholipids
Peptidoglycan
is also known as____________.
a.
N-acetyl muramic acid
b. murein mucopeptide
c.
N acetylglucosamine
d.
mesodiaminopimetic acid
The
last step in synthesis of peptidoglycan is____________.
a.
attachment of a peptide to muramic acid
b. attaching two
amino acids to form a cross-link
c.
attachment of a portion of peptidoglycan to a membrane lipid
d.
binding of penicillin to a membrane protein
The
cocci which forms a bunch and irregular pattern are____________.
a. Staphylococci
b.
diplococci
c.
Tetracocci
d.
Streptococci
Chemotaxis
is a phenomenon of____________.
a.
swimming away of bacteria
b.
swimming towards a bacteria
c. swimming away or
towards of bacteria in presence of chemical compound
d.
none of the above
Which
of the following has peptidoglycan as a major constituent of cell wall?
a.
Gram-negative bacteria
b. Gram-positive
bacteria
c.
Fungi
d.
None of these
Cytoplasmic
inclusions include____________.
a.
ribosomes
b.
mesosomes
c.
fat globules
d. all of these
The
structure responsible for motility of bacteria is____________.
a.
pilli
b. flagella
c.
sheath
d.
capsules
The
arrangement, in which flagella are distributed all round the bacterial cell, is
known as____________.
a.
lophotrichous
b.
amphitrichous
c. peritrichous
d.
monotrichous
Periplasm
is____________.
a. the area between
the inner and outer membranes of gram-negative bacteria
b.
the area between the inner and outer membranes of Gram-positive bacteria
c.
the interior portion of mitochondria
d.
the area outside the cell membrane that is influenced by the polymers
The
next to last step in peptidoglycan biosynthesis is____________.
a.
synthesis of the NAM-peptide subunit
b.
removal of the subunit from bactoprenol
c. linking the sugar
of the disaccharide-peptide unit to the growing peptidoglycan chain
d.
cross-linking the peptide side chains of peptidoglycan
The
common word for bacteria which are helically curved rods is____________.
a.
cooci
b.
pleomorphic
c.
bacillus
d. spirilla
Single
or clusters of flagella at both poles is known as____________.
a.
monotrichous
b.
petritrichous
c. amphitrichous
d.
none of these
Which
of the following bacterial genera (that produces endospore) have medical
importance?
a.
Clostridium
b.
Bacillus
c. Both (a) and (b)