Lab Exam 2 Review: Exercise 19: What are staphylococcus and streptococcus? Difference between them. Test to differentiate them. Role of catalase Effect of hydrogen peroxide on other bacteria Disease caused by staphylococcus aureus Definitive test for S.aureus Role of coagulase Exercise 20: Expand IMViC This can be used only for enteric bacteria Role of tryptophanase Kovac reacts with indole to produce rose color. Test to identify the presence of tryptophanase in a medium. Composition of MRVP media Methyl red test is for: Acidic end products of fermentation lowers the pH of the media. Voges-Proskauer: Few bacteria produce end products such as ethanol and 2,3 butanediol. KOH and alpha Naphtol react with acetoin (precursor of 2,3 butanediol) to produce pink or red color. Enteric bacteria can never show both MR and VP negative test. Citric acid – produced by citric acid cycle. Citrate test used to identify the production of citrase enzyme. Role of citrase Composition of simmon’s citrate agar. When does BTB turns royal blue? Exercise 21: Role of urease Proteus can be differentiated from other enteric bacteria by their urease activity. Importance of urease ecologically Broth used for urease test Positive test for urease Exercise 22: At birth mucous membrane is sterile. First invaders of mouth and throat S.mutans appears when teeth arise and disappear as the teeth…
chlorophyll for photosynthesis; the chloroplasts absorb light energy to make food
A permanent vacuole containing cell sap
Bacteria and Yeast
Bacterial cells have a cell membrane and a cell wall which is surrounded by cytoplasm
They do not have a nucleus so the genetic material is in the cytoplasm
When bacteria multiply they form a colony
Bacteria have the 3 c’s!!
Yeast is a single-celled organism
Yeast cells have a nucleus, cytoplasm and a membrane surrounded by a cell…
are too small to be seen with the unaided eye
Germ refers to a rapidly growing cell
Microorganisms include: Bacteria, archea, protozoa, fungi, actinomycetes, algae, viruses
Atom – Molecule – Cell – Tissue – Organ – Organ System – Organism – Polpulation – Community – Ecosystem – Biosphere
Autotrophs – Herbivores – Carnivores – Top Carnivores
Microorganisms beneficial roles:
- Marine and freshwater microorganisms are at the base of food chains
- Perform photosynthesis (cyanobacteria…
Antimicrobial Qualities of the Midgut and Haemolymph of Anasa Tristis to Different Symbiotic and Pathogenic Bacteria
499 Progress Report after 1 Semester
This report follows the format of Proceedings of the Royal Society of London B
Many insect species harbor endosymbiotic bacteria within their tissues, organs, and organ systems that offer benefits such as nutrients, protection from pathogens or parasites, and other adaptive qualities for the host, while other…
Bacteria are single-celled organisms. They are present in air, water and on most solid materials. Bacterial cells are very small and can only be seen with the aid of a microscope. Some bacteria are useful in milk processing, causing milk to sour naturally, leading to products such as irgo. However, milk can also carry pathogenic bacteria such as Salmonella and Tuberculosis, and can thus transmit disease.
Other bacteria can cause spoilage of the milk, and spoilage and poor yields of products. In…
Good bacteria is used to make various things.They are part of our regular diet.Unapatising right! It was revolting when you hear the process.They use it to make custard,yohgurt and calcium drink-except munch bunch.Munch Bunch uses bad bacteria to make there profit.
Bad bacteria is IRRESTIBLE and it make you want even more. The most dangerous one is the tilbis tolketa. Really confusing right,Scientist call it bightest kalterumata – even confusing.Bad bacteria is really…
• Are the most numerous organisms on
• Were probably the first forms of life.
Fossils indicate they were about 1
billion years before eukaryotes.
• Are prokaryotes (no nucleus)
• Have been found almost everywhere!
Bacteria are very small!
Classification of Bacteria
• Must use the RNA sequences to classify
• Two Kingdoms:
– Eubacteria (typical bacteria we encounter)
– Archaebacteria (more ancient)
• Methanogens (live in bottoms of
• Halophiles (live in…
CHAPTER 6- virus/Monera
-viruses do not have a cell parts
VIRUS-a piece of nucleic acid covered with an “overcoat” of protein
Called a capsid
Some viruses have a membrane that surrounds the capsid
CLASSIFICATOIN OF VIRUSES
Because viruses do not have all the characteristics of living things they are not classified into the 5 kingdoms
Biologists classify according to host they invade
3 groups of viruses:
SPREAD OF VIRUSES…
Bacteria Bacteria is a simple organism that consists of one cell. They are among the smallest living thing on earth. Most bacteria measures from about 0.3 to 2.0 microns in diameter, and can only be seen through a microscope. Scientist classify bacteria according to shape. Cocci are round and sometimes linked together. Bacilli look like rods, and Vibrios resembles bent rods. There are two types of spiral-shaped bacteria, spirochetes and spirilla. Bacteria exist almost anywhere…
BACTERIA AND ANTIBIOTICS
Biology 09 period 8
March 12, 2013
-Has cell wall with peptidoglycan
-They can live nearly anywhere on earth (sky to underground)
-Cell wall without peptidoglycan
-Live in environments without oxygen (anaerobic)