ULTRASTRUCTURE OF BACTERIA
Endotoxins are found in most Gram-positive bacteria. –
False
The color reaction of Gram-negative bacterium after
application of ethanol in the gram staining procedure. –
Colorless
An extrachromosomal DNA molecule within a bacterial cell
that is physically separated from chromosomal DNA and
can replicate independently. – Plasmid
The characteristic arrangement pattern of Caulobacter. –
rosette formation
Cross-linkage of one polypeptide chain with another in the
cell wall of bacteria occurs through these. – Tetrapeptides
The cell walls of Gram-positive bacteria are thicker than in
Gram negative bacteria. – True
Peptidoglycan is also called Murein
Most bacterial pili function to adhere the cell to surfaces. True
A compound that can be found in the bacterial cytoplasm
which can be used for identification including the causative
agent for diphtheria. - Volutin granules
Layer of viscous material composed of polymer loosely
attached to cells which usually produce stringiness in milk.
- Slime
There is/are __2__ pair/s of rings in the flagellum of a
Gram-negative bacterium.
The bacterial flagella rotate in a Corkscrew-like fashion.
Endospores facilitate survival under favorable
environmental conditions. – False
A bacterial structure firmly attached to the cell usually
appears as halo when applied with special stains for
microscopic observations. – Capsule
Due to having an outer membrane the Gram- negative
bacteria are more susceptible to antibiotics. – False
The pili is most commonly found in Gram negative
bacteria.
All bacterial cells have cell wall, a nucleoid and ribosomes.
– False
The outer membrane is found only in Gram negative
bacteria.
A tuft of flagella on one pole has a lophotrichous pattern of
flagellar arrangement.
The characteristic arrangement pattern of Arthrobacter. –
palisade
Bacterial endospores are reproductive bodies of bacteria.
– False
Heat resistance of endospores could be due to large
amount of this substance called dipicolinic acid which is
not present in vegetative cells.
The two subunits of ribosomes in prokaryotes assemble
for protein synthesis to form the 70S unit.
Viruses are neither prokaryotic nor eukaryotic. – True
The two types of bacteria (as to shape) usually possessing
flagella are Bacilli and Helical or Spiral.
Microorganisms divide by fission. – False
The F pilus functions for Sexual reproduction.
A compound that can be found in the bacterial cytoplasm
which serves as energy source and carbon reserve. –
poly-B-hydroxybutyrate
The filament of a bacterial flagellum is composed of a
protein called – Flagellin
Naked, circular chromosome positioned at the center of a
bacterial cell. – Nucleoid
The Gram stain process can provide information on
flagella arrangement. – False
The only Eubacteria without cell wall but contain sterols in
their cytoplasmic membrane. – Mycoplasma
The bacterial cell wall can be degraded by lysozyme. –
True
A bacterium with capsule and pili are more pathogenic
than one without them. – True
Flagella are common in both bacilli and cocci bacteria. –
false
A component of a bacterial cell wall which is present in
Gram+ but absent in Gram - bacteria. - Teichoic Acid
Phospholipid bilayers of bacteria lack sterols. – True
A bacterial cell completely devoid of cell wall is called
protoplasma
The bacterial cell wall functions in transport. – False
The two genera of bacteria usually possessing endospore
are Bacillus and clostridium