Questions
The cell membrane of which of the following bacteria contains sterols?
- Mycobacteria
- Mycoplasma
- Micrococcus
- Rickettsia
Cytoplasmic membrane of a bacterial cell contains membrane proteins located in various positions. Through specific interactions with phospholipid molecules, which of the following functions is performed by inner-surface proteins?
- They provide flexibility to the membrane.
- They transport substances across the cytoplasmic membrane.
- They transport large molecules into the cells.
- They cooperate with other proteins in energy yielding reactions.
Which of the following ribosomal RNAs is not present in bacterial ribosomes?
- 23S
- 5S
- 18S
- 16S
Which of the following cellular structures are used for the identification of bacterium Corynebacterium diphtheriae?
- Volutin granules
- Carboxysomes
- Magnetosomes
- Microcompartments
Which of the following are the polyhedral membrane-bound compartments in the bacterial cells that are made up of a protein shell?
- Gas vesicles
- Volutin granules
- Carboxysomes
- Microcompartments
The position of endospores differs among bacterial species. Endospores are centrally placed in which of the following organisms?
- Clostridium tetani
- Bacillus cereus
- Bacillus subtilis
- Salmonella typhi
Which of the following statements about enzyme DD-transpeptidase is true?
- It provides antigenicity to the cell wall.
- It makes the cell wall semi-permeable.
- It makes the cell wall strong and rigid.
- It breaks the amino acid linkages in the cell wall.
Fimbriae are a type of extracellular structures found in some bacterial cells. Myxococcus uses fimbriae for
- attachment
- motility
- sexual reproduction
- photoreception
Which of the following statements about bacterial flagella are false?
a. They operate at high Reynolds number.
b. Sodium-ion pump driven flagella are found in vibrio.
c. Flagella evolve from Type III secretory system.
d. The S-ring of flagella directly attaches to plasma membrane.
e. Campylobacter jejuni has 11 protofilaments.
f. Fasciculi are seen in spirochetes.
g. Archeal flagella grow by addition of subunits to the base.
- a, b and d
- e, f and g
- a, e and f
- e, b and c
Which of the following organelles of a bacterial cell acts as partial permeability barrier for large substrates?
- Plasma membrane
- Cell wall
- S-layer
- Glycocalyx
Bacteria conjugative pili are absent in
- Rickettsia felis
- Bacillus subtilis
- E. coli
- Brevibacterium mcbrellneri
In Gram-negative cells, M-ring of flagella is embedded in
- plasma membrane
- peptidoglycan layer
- lipopolysaccharide
- cytoplasm
In a Gram-positive cell wall, the structure responsible for providing antigenicity to the organism is
- lipoteichoic acid
- teichoic acid
- lipopolysaccharide
- peptide chain
Fimbriae are found in which of the following?
- Fusobacteria
- Actinobacteria
- Proteobacteria
- Fermicules
Which of the following amino acids is not present in a Gram-negative cell wall?
- L-alanine
- D-alanine
- Meso-Diaminopimelic acid
- D-glutamic acid