The specialized area of biology that deals w/ microorganisms or microbes.
Microbiology
Microscopic organisms too small to be seen w/o magnification.
Microorganisms or microbes
Plants, animals, and microorganisms can be infected by these noncellular, parasitic, protein-coated genetic elements that are dependent on their infected host.
Viruses
Name six main types of microorganisms. Name four additional ones.
bacteria
fungi
algae
virus
protozoa
helminths
cyanobacteria (blue green algae)
archeobacteria
prions (animal pathogen, Mad Cow, no nucleic acid)/viroids (plant pathogens, single strand RNA w/o protein coating)
deficient bacteria (typhus; chlamydia; intracellular parasite, must have host, does not produce ATP)
Prokaryotes first appear.
3.5 million years ago
Eukaryotes appear.
1.8 billion years ago
Light fueled conversion of carbon dioxide to organic material, accompanied by the formation of oxygen.
Photosynthesis
T/F? Photosynthetic microorganisms are responsible for more than 50% of the earth's photosynthesis.
True
The breakdown of dead matter and wastes into simple compounds that can be directed back into the natural cycles of living things.
Decomposition
Many of these are are produced by microbes living in the environment and the digestive tracts of animals.
greenhouse gases
Percentage of microorganisms that exist beneath and within the earth's crust.
50%
Baker's and brewer's yeast are types of the microorganisms.
single-celled fungi
Area of biotechnology that manipulates the genetics of microbes, plants, and animals for the purpose of creating new products and genetically modified organisms (GMOs).
Genetic engineering
Technique that transfers genetic material from one organism to another to deliberately alter DNA.
Recombinant DNA
T/F? Microbes can be engineered to synthesize desireable proteins such as drugs, hormones, and enzymes.
True. Bacteria = antibiotics, yeasts = insulin, pigs = human hemoglobin, plants that contain natural pesticides, fruits that do not ripen too rapidly.
Process that involves introducing microbes into the environment to restore stability or to clean up toxic pollutants. Relies on many different microbes working together.
Bioremdiation
T/F? The majority of microorganisms that associate w/ humans are harmful.
False. Most are beneficial.
What is the approximate number of microbes that can cause human disease?
2000
Number of deaths from infectious diseases worldwide.
13 million annually
Infectious disease that are on the rise. (4)
SARS
AIDS
Hep C
viral enchephalitis
Infectious diseases that have been eradicated. (4)
polio
measles
leprosy
those caused by certain parasitic worms
Most common infectious cause of death.
respiratory infection
Bacterium that causes gastric ulcers.
Helicobacter
T/F? An association has been established between certain cancers and viruses.
True
Diabetes have been linked to this virus.
Coxsackie virus
Virus that has been linked to schizophrenia.
borna agent
T/F? Diseases like multiple sclerosis, OCD, and coronary artery disease have been linked to chronic infections w/ microbes or viruses.
True
Which are smaller and lack organelles, pro- or eukaryotic cells?
prokaryotic
Small double membrane bound structures that perform specific functions. i.e. nucleus, mitochondria, chloroplasts.
organelles
T/F? All prokaryotes are microorganisms, but only some eukaryotes are microorganisms.
True
T/F? A virus contains both DNA and RNA.
False. They contain either but never both.
Microbes that require interactions w/ other organisms.
parasites
Provided the earliest record of microbes.
Robert Hooke.
Developed a single lens microscope. Observed "animalcules" in water and plaque from teeth. Father of bacteriology and protozoology.
Leeuwenhoek
Conducted an experiment w/ meat in jars that disproved the spontaneous generation of maggots,
Redi
Conducted an experiment with sterilized swan neck bottles and proved that a cell comes from a cell. Helped understand the microbial role in wine and beer formation.
Pasteur
When was the first prototype of the modern compound microscope made?
Mid-1800s. Capable of 1000x magnification
An entire body of ideas that expresses or explains mant aspects of a phenomenon, often developed through years of research and added to or modified by new findings.
Theory
Provided initial evidence that some microbes in dust and air have very high heat resistance.
Tyndall
Discovered and detailed heat-resistant bacterial endospores.
Cohn
Being completely free of all life forms and virus particles.
sterile
His studies linked microbes w/ a specific disease. Established postulates - series of proofs that verified the germ theory. Along w/ colleagues, invented most culturing techniques.
Koch
Physician who observed that mothers who delivered at home had fewer infections than those who gave birth in hospitals. Semmelweis showed that women became infected after examinations had been performed by physicians who had just done autopsies.
Holmes
Introduced aseptic techniques aimed at reducing microbes in a medical setting and preventing wound infections.
Lister
A theory supported by much data collected over time.
law
The science of classifying living things. Linne or Linnaeus laid down basic rules for classification.
taxonomy
Three primary concerns of modern taxonomy.
naming
classifying
identifying
The assignment of scientific names to various the various taxonomic categories and individual organisms.
nomenclature
The orderly arrangement of organisms into a hierarchy of taxa.
classification
Discovering and recording traits or organisms so that they may be recognized or named and olaced in an overall taxonomic scheme.
identification
Taxonomic categories from top to bottom.
Domain
Kingdom
Phylum (or division)
Class
Order
Family
Genus
Species
The method of assigning scientific or specific name. The name is a combo of the generic (genus) name followed by the species name.
binomial system of nomenclature
Founded on the two preconceptions that 1) all new species originate from preexisting species and 2) closely related organisms have similar features because they evolved from a common ancestor. Accounts for millions of different species on earth and their adaption to the many diverse habitats.
evolution
The study of structure of organisms
morphology
The study of function
physiology
The study of inheritance of organisms.
Genetics
Developed the five kingdom system for general taxonomic arrangements or kingdoms based on structural similarities and differences and the way organisms obtained nutrition.
Whittaker
Whittaker's 5 major kingdoms, and the two major cell types.
monera
protists
plants
fungi
animals
prokaryotic
eukaryotic
Woese discovered that the macromolecule located in this organelles was highly conserved and nearly identical in organisms within the species.
ribosome
Archaea, characterized by their ability to live in extreme conditions, were grouped with these before it was discovered that its ssu rRNA was significantly different.
Bacteria, as archaeabacteria.
Archaea's prokarytic structure and close relation to eukaryotes resulted in Woese and Fox to create these major taxonomic units. Name them (3).
Domains
Archaea (pro-)
Bacteria (pro-)
Eukarya (eu-)
T/F? Viruses belong to the domain bacteria.
False. Not included in any classification or evolutionary scheme. They are not cells or organisms.
Which of the following parts was absent from Leeuwnhoek's microscopes?
focusing screw
lens
specimen holder
condenser
condenser
Term that refers to spontaneous generation of organisms from nonliving matter.