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Bio
Prokaryotes
93
Biology
Undergraduate 1
01/30/2013

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Term
What are the domains of Prokaryotes?
Definition
Bacteria and Archaea
Term
True or false: Prokaryotes are one of the most numerous organisms on Earth.
Definition
False: They are THE most numerous organisms on Earth.
Term
True or false: prokaryotes have little variety.
Definition
False: prokaryotes have tremendous diversity.
Term
True or false: much is still unknown about prokaryotes.
Definition
True.
Term
What gives prokaryotes their tremendous physiological diversity?
Definition
How they adapt their physiology to extreme environments.
Term
What do prokaryotes lack?
Definition
Membrane bound organelles.
Term
What organelle do prokaryotes have?
Definition
Ribosomes.
Term
Are prokaryotes generally single celled or multicelled?
Definition
Single celled.
Term
What is the general size of prokaryotes?
Definition
0.5 - 5 micrometres.
Term
What is the value of a micrometre?
Definition
10^-6
Term
What are the three main common shapes of Prokaryotes?
Definition
- Cocci
- Bacilli
- Sparilla
Term
What is the shape of Cocci?
Definition
Sphere.
Term
What is/are the kind(s) of Cocci?
Definition
Diplococci, Streptococci ans Staphlococci.
Term
What is the shape of Bacilli?
Definition
Rod.
Term
What is/are the kind(s) of Bacilli
Definition
Streptobacilli
Term
What is the shape of Sparilla?
Definition
Spiral.
Term
What is/are the kind(s) of Sparilla?
Definition
Spirochete
Term
What is the diplococci shape?
Definition
Spheres in pairs.
Term
What is the streptococci shape?
Definition
Chains of many cells
Term
What is the Streptobacilli shape?
Definition
Chains of many cells
Term
What is the Spirochete shape?
Definition
Corkscrew.
Term
What is the shape of Staphlococci?
Definition
Grape-like cluster
Term
What do prokaryotes have for protection?
Definition
Cell walls.
Term
What, besides prokaryotes, have cell walls?
Definition
Plants, Fungi, Archaea and Bacteria.
Term
What is the name of the stuff that comprises the cell walls of plants?
Definition
Cellulose.
Term
What is cellulose made of?
Definition
Glucose polymer.
Term
What is the name of the stuff that comprises the cell walls of fungi?
Definition
Chitin
Term
What is Chitin made of?
Definition
Nitrogen containing polysaccharides.
Term
What is the name of the stuff that comprises the cell walls of bacteria?
Definition
Peptidoglycan.
Term
What is Peptidoglycan made of?
Definition
Polymers of sugars and amino acids.
Term
What test is used to determine the structure of a bacterial cell wall?
Definition
Gram Stain
Term
What are the two results that can come from a Gram Stain?
Definition
Gram Positive and Gram Negative
Term
What does Gram Positive look like?
Definition
Purple stain.
Term
What is Gram Positive indicative of?
Definition
One external layer of peptidoglycan.
Term
What does Gram Negative look like?
Definition
Pink stain.
Term
What is Gram Negative indicative of?
Definition
Peptidoglycan sandwhiched between membranes.
Term
What is the result of having peptidoglycan sandwhiched between membranes?
Definition
The cell can have higher drug resistance.
Term
Archaea cell walls are _____________ similar but _______________ different.
Definition
Archaea cell walls are structurally similar but chemically different.
Term
Capsule
Definition
External layer of polysaccharides and protein.
Term
What does Capsule help with?
Definition
- Helps bacteria attach to surfaces and each other.
- Aids in formation of biofilms.
Term
What does biofilm do?
Definition
- Causes disease
- Help digest food in large intestine
- Cycle nutrients in ecosystem
- Aid plant growth.
Term
What kind of movement are prokaryotes capable of?
Definition
Taxis
Term
Taxis
Definition
Directed movement toward (positive) or away from (negative) stimuli.
Term
What is an example of taxis?
Definition
Chemotaxis.
Term
What are the structures with which prokaryotes perform taxis?
Definition
Flagellum, Pilli and Fimbriae.
Term
Flagellum
Definition
Tail-like structure
Term
How is a prokaryotic flagellum different from a eukaryotic flagellum?
Definition
It is not an extension of the cytoskeleton.
Term
Pilli and Fimbriae
Definition
Short hair-like structures.
Term
What do Pilli and Fimbriae do?
Definition
Holds cells together.
Term
What is a prokaryote's DNA like?
Definition
A singular circular chromosome.
Term
Where is the prokaryote's DNA?
Definition
in the nucleoid region.
Term
What structural feature serves the function of the mitochondrial cristae and the chloroplast thykaloids?
Definition
Plasma membrane infoldings.
Term
Plasma membrane infoldings reproduces the functions of what eukaryotic structures?
Definition
Mitochondrial cristae and chloroplast thykaloids.
Term
What is structurally beneficial about the infoldings of the prokaryote's plasma membrane?
Definition
They allow for more surface area, which increases efficiency.
Term
Through what process do prokaryotes replicate themselves?
Definition
Binary fission.
Term
What are the steps involved in binary fission?
Definition
Chromosome replication and cell division.
Term
Can Prokaryotes be diploid? Why or why not?
Definition
No, because they only have one chromosome, so they can only have one allele for a gene.
Term
Endospore
Definition
An inert cell formed inside a metabolically active bacteria cell that is capable of withstanding extreme conditions.
Term
How is an endospore activated?
Definition
Rehydration in a favorable environment
Term
True or false: Because prokaryotes are asexual, they do not have tremendous diversity.
Definition
False: Although prokaryotes are asexual, they have tremendous diversity.
Term
What are the means through which prokaryotes have tremendous genetic diversity?
Definition
- Rapid reproduction and mutation. - Genetic recombination.
Term
Genetic Recombination
Definition
The combining of DNA from two sources.
Term
What are the forms of genetic recombination?
Definition
Transformation, transduction and conugation.
Term
What is the structure with which genetic recombination occurs?
Definition
Plasmid.
Term
Plasmid
Definition
Small circular DNA strand with a few genes.
Term
What does the Plasmid do?
Definition
Replicates independently and exchanges with other genes.
Term
Where is the Plasmid?
Definition
Separated from the chromosome.
Term
Transformation
Definition
Takes in genes from environment.
Term
Transduction
Definition
Genes from bacteriophage virus.
Term
Conjugation
Definition
Exchange between bacterial cells.
Term
Autotrophic
Definition
Carbon source is inorganic.
Term
Heterotrophic
Definition
Carbon source is organic.
Term
Obligate Aerobe
Definition
Requires oxygen
Term
Facultative Aerobe
Definition
Uses O2 if available, but can use other electron acceptors.
Term
Obligate anaerobe
Definition
Poisoned by O2.
Term
True or false: prokaryotes have huge metabolic diversity.
Definition
True.
Term
What are the two types of autotrophs?
Definition
Photoautotrophs and Chemoautotrophs.
Term
What are the two types of Heterotrophs?
Definition
Photoheterotrophs and Chemoheterotrophs.
Term
What is the energy source of a photoautotroph?
Definition
Light.
Term
What is the carbon source of photoautotrophs?
Definition
CO2, HCO3- or related inorganic compounds.
Term
What is the energy source of a chemoautotroph?
Definition
Inorganic chemicals such as H2S, NH3 or Fe2+.
Term
What is the carbon source of a chemoautotroph?
Definition
CO2, HCO3- or related inorganic compound.
Term
What is the energy source of a photoheterotroph?
Definition
Light
Term
What is the carbon source of a photoheterotroph?
Definition
Organic compounds.
Term
What is the energy source of a chemoheterotroph?
Definition
Organic compounds.
Term
What is the carbon source of a chemoheterotroph?
Definition
Organic compounds.
Term
What are the the extremes of Archaea?
Definition
- Extreme Halophiles
- Extreme Theromophiles
Term
Extreme Halophiles live in...
Definition
high salinity environments.
Term
Extreme Thermophiles live in...
Definition
high temperature environments.
Term
What is a type of Archaea that live in a more moderate environment?
Definition
Methanogens
Term
Methanogens produce...
Definition
Methane in anoxic environments as a byproduct of energy production.
Term
Methanogens are found where?
Definition
In wetlands and the intestines of some animals, including humans.
Term
True or false: much remains unknown about archaea.
Definition
True.
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