Microbiomes etc Flashcards
- What is a microbiome?
a. The The entire habitat, including the microbes (bacteria, archaea, lower and higher eukaryotes, and viruses), their genomes (i.e., genes), and the surrounding environmental conditions
- What is Microbiota?
a. Bacteria, archaea, fungi, protists, and algae
- What is a biome?
a. A reasonably well defined habitat which has distinct bio-physio-chemical properties
- What microbial structural elements are there (4)?
a. Proteins/peptides
b. Lipids
c. Polysaccharides
d. Nucleic acids : DNA and RNA
- What type of mucleic acid material is there within the microbiome?
a. DNA?RNA
b. Mobile genetic elements
c. Viruses/phages relic DNA
Why do bacteria act differently on agar then in the eviroment
this is not how they behave normally so this will cause their phenotypes to change
- What are the internal/external structural elements of the microbiome?
a. Environmental conditions
- What microbial metabolites are there within a microbiome?
a. Signalling molecules
b. Toxins
c. Organic molecules
- Why is using the term microflora incorrect and you should use microbiota?
a. The assemblage of microorganisms presents within a defined environment. Sometimes microflora is used but as microorganisms are not plants this is wrong.
- What are metataxonomics?
a. High-throughput processing used to characterise the entire microbiota. Typically uses marker genes such as the 16S rRNA gene.
- What is a Metagenome?
a. The collection of genomes and genes from the members of the microbiota.
- What is metabolomics/metabonomics?
a. The collection of metabolite profiles within a single sample/location and how they are impacted by external factors.
- What are meta transcriptomics?
a. The analysis of a suite of messenger RNA from a sample/system. Gives information on the regulation and expression of genes.
- What are Metaproteomics?
a. Large-scale characterisation of the entire protein complement of a sample at a given time.
- What percentage of microbes can be cultured?
a. 1-5%
- What is a biofilm?
a. A biofilm is a structured community of microbial cells enclosed in a self-produced extracellular polymeric matrix (EPS) and adherent to inert or living surfaces
- What do Pseudomonas fluorescens biofilms that grow on the surface of plant roots prevent?
a. The growth of fungal pathogens
- What are the four main benefits to biofilms?
a. Protection
b. Stability
c. Nutrients
d. Community
- How do biofilms create protection (6)?
a. Antibiotics
b. Toxins
c. Antibodies
d. Phage attack
e. Predation
f. Environment
- How do biofilms create stability (3)?
a. Stable growth
b. Environment
c. ‘normal’ growth
- How do biofilms aid in nutrients (5)?
a. Concentration
b. Trace compounds
c. Waste products
d. Reduces gene range
e. Cooperation
- How does community affect biofilms (3)?
a. Gene transfer
b. Signal transduction
c. Quorum sensing
- How do biofilms develop (3)?
a. Adhesion
b. Maturation
c. Dispersion
- What type of structure does Corynebacterium and cocci in plaque form?
a. Corncob
- When there is low density of microbial cells there is ________ and when there is high density of cells then there is _________ behaviour.
a. Individual
b. Group
- What are the three types of Quorum activity?
a. Quorum sensing
b. Quorum sensing competitive inhibition
c. Quorum quenching
- Biofilms can either be ___________ or _________.
a. Cooperative
b. Competitive
- What ways can biofilms be studied (7)?
a. Microscopy
b. Cultoromics
c. Metabarcoding
d. Metagenomics
e. Metatranscriptomics
f. Metaproteomics
g. Metabolomics
- What two scales are to be considered when studying biofilms?
a. Temporal
b. Spatial
- What is the holobiont?
a. is an assemblage of a host and the many other species living in or around it, which together form a discrete ecological unit
- What disease states are affected by microbiomes (3)?
a. Dysbiosis
b. Low diversity
c. Variable
- What healthy states are affected by microbiomes?
a. Eubiosis
b. High diversity
c. Uniform
- What are healthy interactions with microbiomes?
a. Obligate symbiosis
b. Vertical inheritance
c. Metabolic collaborations
- What is antagonistic coevolution?
a. Parasitic
b. Diseased state
- What is mutulatistic coevolutoion?
a. Positive interactions healthy state
- There are 5 types of microbial holobionts, one is a pathogen, one a symbiont. What are the other three?
a. Opputunistic pathogen
b. Pathobionts
c. Commensals
- What is genomics the study of?
a. Genes
- What are transcriptomics the study of?
a. mRNA
- What are proteomics the study of?
a. Proteins
- What are metabolomics the study of?
a. Metabolites
- What is the definition of metabolomics?
a. The study of chemical processes involving live metabolites, the small molecules substrates, intermediates, and products of metabolism within a system. Typically requires identification and quantification of all metabolites.
- What is metabolite fingerprinting?
a. The creation of a spectral fingerprint from a sample. This doesn’t involve the identification or quantification of metabolites
- What is metabolite profiling?
a. Focus on the analysis of a large group of metabolites that is either related to a specific metabolic pathway or a class of compounds.
- What is targeted metabolomics?
a. Involved the quantitative measurement of known metabolites from defined metabolic process, such as amino acids.
- What is metabonomics?
a. The study of how the metabolome of an organism is impacted by external factors such as diet , environment, toxins etc.
- What does NMR stand for?
a. Nuclear magnetic resonance
- Are the sample that enter a mass spec and NMR dry or wet?
a. Dry
- What type of container are samples of NMR placed in?
a. Glass
- What is a “Sweep” in NMR?
a. When the magnets create the alignment
- What is a “Shift” in NMR?
a. The alignment of the atoms after a sweep takes place
- What type of solvents must the NMR and Mass spec samples be mixed with?
a. Polar
- What is an isotope?
a. Same atom different neutrons
- What makes isotopes useful for NMR?
a. They have a unique spin
- What is precession in relation to NMR?
a. the change of spin induced from the magnets in the NMR
- What effect do the electron clouds of a molecule have on the effects of spinning in a NMR?
a. The higher electron density the higher the shielding
- How is the spin in the NMR calculated?
a. The amount of electric current created in the coil
- What is a frequency spectrum (NMR)?
a. The frequency assigned to a specific isotopes electric current
- What is a chemical shift (NMR)?
a. The differences in the chemical structure of the nuclei
- What is J-coupling (NMR)?
a. When electrons from neighbouring atoms affects another atom
- What are the benefits of NMR(4)?
a. Highly reproducible results
b. Non-destructiuve analysis of samples
c. Ideal for structural characterisation
d. Relatively cheap to run
- What are the drawbacks of NMR (4)?
a. Limited sensitivity for metabolite
b. Limited sensitivity reduces range of measurable metabolites
c. Very expensive capital expenditure for equipment
What are samples kept at -80C?
Prevent further cell metabolism ans keep at sample taking state
What are proteins to big to be use in?
Mass Spec
- What does Mass Spec analyse?
a. Analysis of ions within a vacuum
b. Measure the Mass of the different ions
- How are the ions separated in a Mass Spec?
a. To a mass to charge ratio
- What do the Quadropoles then use to filter?
a. Electric charge
- What separates based on speed of travel?
a. Time of flight
- Mass Spec gives us Mass-to-Charge (____/____) against _______
a. M/Z
b. Intensity
- What are the different types of measuring in mass spec?
a. Direct infusion MS
b. Matrix Assisted Laser desorption Ionisation MS
c. Liquid Chromatography MS
d. Gas Chromatography MS
e. Ambient Ionisation MS
- What is direct infusion Mass Spec and what are the steps(3)?
a. Sample extracted into solvent
b. Extract injected directly into MS over two minutes
c. Typically linked to an electrospray ionisation
- What is considered the easiest method of Mass spec?
a. Direct infusion MS
- What is the downfall of Direct infusion MS?
a. Gives a limited fingerprint
- What is Matrix Assisted Laser desorption Ionisation MS and what are the steps (5)?
a. Sample is spotted onto a stainless steel plate
b. A matrix is added on top and provides protons
c. Matrix adsorbs energy from lases (UV or Nd:YAG)
d. This results in an energy ‘cloud’ of ions to erupt
e. Analysed using the time-of-flight
- What is time of flight?
a. Time of flight (ToF) is the measurement of the time taken by an object, particle or wave (be it acoustic, electromagnetic, etc.) to travel a distance through a medium.
- What is Liquid Chromatography MS and what are the steps(3)?
a. Samples contents are separated first
b. Molecules move through columns at different speeds
c. Created a 3D data set based on retention times
- What is Gas chromatography and the steps (4)?
a. Samples are extracted and derivatised so that they are volatile
b. The samples are then heated and enter into a column inside an oven
c. Different metabolites progress through at different speeds
d. Created a 3D data set
- What is ambient ionisation MS and what are the steps(4)?
a. Generation of ions in a standard atmosphere
b. Ions captured and transferred through a tube hit by a laser
c. Aerosol is transferred to solvent matrix
d. Hits collision surface
- What are the benefits of ambient ionisation MAS?
a. Opens up a wide range of application areas
b. Allows analysis in almost real time
c. Mainy different AIM varieties