Podcast
Questions and Answers
What are hormogonia?
What are hormogonia?
- Specialized structures for nitrogen fixation
- Fragments of filamentous cyanobacteria that develop into new filaments (correct)
- A type of spore formed during unfavorable conditions
- Cells that undergo binary fission
How do heterocysts function in filamentous cyanobacteria?
How do heterocysts function in filamentous cyanobacteria?
- They are specialized cells that allow for nitrogen fixation (correct)
- They protect the cells from drought
- They are responsible for asexual reproduction through fission
- They enhance the motility of the filaments
In what way do akinetes contribute to the survival of cyanobacteria?
In what way do akinetes contribute to the survival of cyanobacteria?
- They fragment and develop into new filaments
- They are specialized for photosynthesis
- They allow survival during unfavorable conditions by resisting cold and drought (correct)
- They reproduce rapidly in favorable conditions
What process involves bacteria transferring DNA through a conjugation bridge?
What process involves bacteria transferring DNA through a conjugation bridge?
Which of the following describes transformation in bacteria?
Which of the following describes transformation in bacteria?
What characterizes the way cyanobacteria reproduce asexually?
What characterizes the way cyanobacteria reproduce asexually?
What is the primary role of transduction in bacteria?
What is the primary role of transduction in bacteria?
What happens to vegetative cells of cyanobacteria under unfavorable conditions?
What happens to vegetative cells of cyanobacteria under unfavorable conditions?
Flashcards
Binary fission
Binary fission
Division of a cyanobacterial cell into two identical daughter cells. This is the primary mode of asexual reproduction.
Akinetes
Akinetes
Specialized cells within cyanobacterial filaments that are resistant to harsh conditions, such as cold and drought. They allow the cyanobacteria to survive unfavorable periods and later resume growth.
Transformation
Transformation
A process where bacteria take up DNA from their surroundings. This DNA can be integrated into the bacterial genome, altering its genetic makeup.
Hormogonia
Hormogonia
Signup and view all the flashcards
Heterocysts
Heterocysts
Signup and view all the flashcards
Conjugation
Conjugation
Signup and view all the flashcards
Transduction
Transduction
Signup and view all the flashcards
Filament fragmentation
Filament fragmentation
Signup and view all the flashcards
Study Notes
Asexual Reproduction of Cyanobacteria
- Cyanobacteria are unicellular or filamentous, often surrounded by a gelatinous sheath.
- Reproduction occurs through binary fission and spore formation.
- Filaments can fragment at weak points or heterocysts.
- Fragmentation creates short pieces called hormogonia, which develop into new filaments.
- Hormogonia are surrounded by a mucilaginous sheath.
Endospore Formation
- Spores are formed when conditions become unfavorable.
- The spore coat completely surrounds the DNA, cytoplasm, and plasma membrane.
- The heat resistance is increased.
- Spores remain dormant until conditions improve, then germinate and revive.
Genetic Recombination in Bacteria
- Bacteria can undergo genetic recombination.
- Genetic combinations can occur through conjugation, transformation, or transduction.
- Conjugation involves direct contact and exchange of genetic material.
- Transformation involves uptake of DNA from the environment.
- Transduction is the transfer of genetic material by bacterial viruses (bacteriophages).
Heterocysts and Akinetes
- Heterocysts are specialized cells in filaments that fix nitrogen.
- Akinetes are enlarged, resistant, vegetative cells that form under unfavorable conditions.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
