Which groups of bacteria produce catalase & SOD? Why is it necessary to do so?
SOD (superoxide dismutase) and Catalases are enzymes produced by Aerobic bacteria (and other multicellular aerobes in general). Anaerobes produce very little or no amount of SOD and catalase.
Function of SOD: Converts superoxides (O2-) into oxygen (O2) and Hyprogen peroxide (H2O2) through a redox reaction.
Function of Catalase: Converts Hyprogen peroxide into water and oxygen.
An aerobic organism produces free radicals through out its life due to the reduction of Oxygen molecules during respiration. SOD and Catalase are necessary for an aerobic bacteria to combat the effects of free radicals and Reactive Oxygen Species (ROS) like superoxides and Hydrogen peroxides (which is the by product formed from the action of SOD on superoxides).
If it weren't for these two enzymes, survival of aerobes will be difficult since the free radicals and ROS (in this case, O2- and H2O2) will cause damage to cells, proteins and DNA of the organism and eventually its death.
Which groups of bacteria produce catalase & SOD? Why is it necessary to do so?
Which of the bacteria (A-E) would you expect to be catalase positive and why? There may be more than one of the bacteria positive for catalase. A. Obligate Aerobe B. Facultative Anaerobe C. Aerotolerant Anaerobe D. Obligate Anaerobe E. Microaerophile
How is this test used diagnostically? Which bacteria is more virulent and why? using the Catalase test and the bacterias being Staphylococcus aureus and Staphylcocccus epidermidis
There may be more Which of the bacteria (A-E) would you expect to be catalase positive and why? than one of the bacteria positive for catalase. A OBLIGATE AEROBE B FACULTATIVE ANAEROBE CAEROTOLERANT ANAEROBE D OBLIGATE ANAEROBEE MICROAEROPHILE Extra: In a Gram stain one step could be omitted and still allow differentiation between Gram positive and Gram negative bacteria. What is that step? Why?
a catalase test is usually not performed on bacteria growing on a blood agar plate. Why not?
What is a clinical application of the catalase test? What is a clinical application of the oxidase test? Why do you think some bacteria produce gas during fermentation and others do not?
Question 17 1 pts True or False: Catalase protects bacteria from toxic reactive oxygen species which may cause oxidative damage to cells. O True O False
9) of the following bacteria which is more resistant to higher temperature a. one which produce capsule b. one which produce flagella c. one which produce spore d. one which produce cell wall 10) Name two genuses of bacteria that undergo spore formation 11) What is a pH in relation to any given media a, sodium concentration in media b. chlorine concentration in media c. hydrogen concentration in media d. none of the above 12) Name two important media ingredients...
Why do certain fruits and vegetables have more catalase enzyme than others? Spinach followed by carrots resulted in the most catalase from the following: cucumbers, bananas, oranges, strawberries, spinach, and carrots.
Which of the organic functional groups do you find the most interesting? Why? Which of them do expect to be most widely found in the world? Why?
Bacteria and plants that live in soils will sometimes produce
biogenic siderophores which are small organic compounds that act as
ligands to complex metals. It can be difficult for
bacteria and plants to move around and find nutrients on their own
sometimes, so they rely on siderophores to do the job for
them. They produce the siderophores, release them when
water passes by, and the siderophores complex metal nutrients like
iron, and the bacteria or plants can then suck up the
iron-siderophore...