Which bacterial cell structure plays a crucial role in conjugation, facilitating genetic exchange?
Flagella
Pili
Fimbriae
Capsule
Related Questions
Which one of the following statements about mycoplasma is wrong?
Mycoplasmas lack a cell wall.
Mycoplasmas are facultative anaerobes.
Mycoplasmas have a rigid cell wall.
Mycoplasmas have a small genome.
Choose the incorrect statement for cyanobacteria.
Perform oxygenic photosynthesis
Lack flagella throughout the life
Have specialised cells for nitrogen fixation
Have chlorophyll a and b similar to higher plants
Certain bacteria can survive extreme conditions like high salinity, high temperature, or high acidity. This ability is primarily attributed to:
Presence of a nucleus with a distinct nuclear membrane
Possession of membrane-bound organelles like mitochondria
Specialized cell wall structure and unique biochemical adaptations
Their ability to form endospores under all conditions
Read the following statements regarding methanogens and select correct options
(i) They are included in the group of archae bacteria
(ii) They are responsible for the production of biogas in gober gas plants
(iii) They live in hot sulphur springs
(iv) They are strictly anaerobic
Only statements (i) and (ii) are correct
Only statements (i), (ii), (iv) are correct
Statements (ii), (iii) and (iv) are correct
All statements are correct
Which of the following is not characteristic of Gram positive bacteria?
Thick peptidoglycan layer
Purple Gram stain result
Teichoic acids in the cell wall
Outer membrane with Lipopolysaccharide (LPS)
Which of the following is NOT a method of genetic recombination in bacteria?
Binary fission
Transduction
Transformation
Conjugation
Identify the organism that is characterized by the absence of a defined cell wall, the ability to cause diseases in both plants and animals, and the capacity to thrive in anaerobic conditions.
Mycoplasma
Cyanobacteria
Actinomycetes
Rickettsia
Read the given statements and select the correct option.
Statement A: Monerans are most primitive organisms
Statement B: Monerans include only Bacteria
Statement A is correct and Statement B is incorrect
Statement A is incorrect and Statement B is correct
Both Statement A and Statement B are correct
Both Statement A and Statement B are incorrect
Which of the following statements is FALSE regarding plasmids?
They are self-replicating.
They can carry genes for antibiotic resistance.
They are always integrated into the bacterial chromosome.
They are extrachromosomal DNA molecules.
State whether the given statements are true or false
I. Bacteria shows both autotrophic and heterotrophic nutrition
II. Some of the bacteria are autotrophic. They may be photosynthetic autotrophic or chemosynthetic autotrophic
III. Heterotrophic nutrition involves the obtaining of readymade organic nutrients from outside sources
I and II are true
I is true, II and III is false
I, II and III are true
I, II and III
