Prokaryotes Flashcards
Prokaryotes
-Exist almost everywhere, including places where ____________ cannot survive.
-Biomass outweighs all eukaryotes combined by at least ________.
-eukaryotes
-10x
Prokaryote Functions
-Break down organic material in dead plants and animals.
-Release ______ used by plants.
-Make _________ available to most life forms.
-O2 in atmosphere came from photosynthetic ___________.
-CO2
-Nitrogen
-Bacteria
Prokaryotes
Both __________ and __________ to humans.
-Important to produce some _______.
-Chemical reactions in industry.
-Used for pharmaceutical products
-Bioremediation of ___________ sites.
-Beneficial
-Harmful
-food
-polluted
Shared Characteristics of the 3 Domains: Bacteria, Archaea, Eukarya
-____________
-____________
-Plasma membrane
-DNA
-Ribosomes
Archaea and Bacteria Characteristics:
-___________
-No Membrane-bound organelles
-No nucleus
Bacteria and Archaea:
-____________
-No _________
-No ____________
-Prokaryotes
-nucleus
-membrane-bound organelles
Domain Bacteria and Archaea
-___________
-__________ ____________
-No ____________
-No ________-________ ___________
-PROKARYOTES
-Unicellular
-Asexual reproduction
-No Nucleus
-No membrane-bound organelles
Domain Eukarya
- ____ or _________________
-___________ or __________ _____________
-____________
-_________-__________ __________
-EUKARYOTES
-Uni or multicellular
-sexual or asexual reproduction
-Nucleus
-Membrane-bound organelles
Prokaryotic Genomes
-Prokaryotes genomes _________, simpler than eukaryotes
-1/1000 as much DNA as a eukaryote
-5,000 genes vs. 50,000 in eukaryotes
-DNA condensed in ________ ________ of cytoplasm.
-similar to nucleus but __ ________
-Single, circular, double-stranded DNA chromosome.
-smaller
-nucleoid region
-no membrane
Prokaryote Reproduction
-Prokaryotes grow and adapt _______.
-Reproduce ______ _________ via ______ _______.
-No _______
-A single cell in favorable conditions will produce a colony of offspring (10^12 cells in 24 hrs!)
-rapidly
-mostly asexually
-binary fission
-Meiosis
Binary Fission in Prokaryotes
1. Circular __________ replicates
2. Copies of DNA _________ as cell enlarges.
3. _______ ________ and ____ _____ separate into two cells.
-chromosome
-separate
-Plasma membrane
-cell wall
Prokaryote Reproduction
-Because of _______, microbial growth is ____________.
-__________ occur more often!
-fission
-exponential
-mutations
When conditions unfavorable, some bacteria form __________ (dormant condition).
-Cytoplasm and chromosome _________.
-Encased by ___ layers.
Resistant to:
1. ______
2. Drying
3. ___________
4. Antibiotics
5. Various chemical disinfectants
-Can survive for ____________ in this dormant state!
-endospores
-dehydrate
-3
-heat
-radiation
1000s of years
Genetic Diversity?
-______ ________ but….
-Several mechanisms to combine genes between individuals
-These are called __________ ______ __________.
-Allows genetic transfer between prokaryotes:
1. Transformation: a cell absorbs and integrates fragments of ___ from the ___________.
2. Conjugation: one cell directly transfers genes to ________ ____.
3. Transduction: ________ transfer genes between prokaryotes.
-Lacks meiosis
-horizontal gene exchange
-DNA
-Environment
-another cell
-viruses
Domain Bacteria
Bacteria differentiated with Gram Stain
-Gram positive
-Retain dyes (purple and red)
- Appear _________
- _______ cell wall
-Gram negative
- Only retain red dye
-Appear ______
-_____ cell wall
-purple
-thick
-pink
-thin