50 Multiple choice questions

The sum total of all chemical reactions taking leave in a living cell

• Movement

• Metabolism

• Absorption

• Excretion

What does TSI stand for?

• Titration of Sugar Ions test.

• Triple Sugar Ion (TSI) Fermentation test

• Total Soluble Ions test.

• Turbidity and Sugar Interaction test.

Pathogenic bacteria

• bacteria that produce toxin

• bacteria that multiply in the host

• both are pathogenic enteric bacteria that cause serious diseases (salmonellosis, shigellosis) and require special containment precautions.

• bacteria that cause disease

What indicates that bacteria ferment only glucose (0.1%) in TSI test?

• The butt of the tube turns yellow and the slant remains red.

• The butt of the tube remains red and the slant turns yellow.

• Both the butt and slant of the tube turn yellow.

• Both the butt and slant of the tube remain red.

What indicates a positive Indole test?

• The presence of a red ring after adding Kovac's reagent.

• The absence of color change after adding Kovac's reagent.

• A yellow color change after adding Kovac's reagent.

• A blue color change after adding Kovac's reagent.

What is the purpose of Triple Sugar Iron Test?

• A test that determines which type/s of carbohydrates are fermented by a specific bacteria, and the types of products that are formed.

• Identifying bacteria based on their ability to use citrate as a sole carbon source.

• The presence of an enzyme in bacteria that breaks down the amino acid tryptophan to produce Indole.

What indicates fermentation with gas production in the carbohydrate fermentation test?

• Medium remains red with no gas production.

• Color of the medium turns yellow and gas is collected in the Durham tube.

• Color changes to orange with minimal gas.

• Medium turns green and gas is released.

Bacillus subtilis forms endospores, which are highly resistant to heat and other environmental stresses. Endospores require longer exposure to heat (higher TDT) to be destroyed, while Staphylococcus aureus is a non-spore-forming bacterium and is killed more easily at lower temperatures and shorter times.

• The bacteria produce alkaline products and can utilize citrate.

• The presence of an enzyme in bacteria that breaks down the amino acid tryptophan to produce indole.

• Break down citrate to make alkaline products (sodium carbonate).

Term: Refers to the breakdown sugars in presence of oxygen, to produce CO2 H2O & energy

• Photosynthesis

• Aerobic/Cellular respiration

• Metabolism

• Anaerobic respiration/fermentation

Agents that inhibit the growth or reproduction of bacteria but do not necessarily kill them. (When the agent is removed, bacteria can potentially grow again.)

• Define Moist heat

• Define Dry heat

• Define Bactericidal

• Define Bacteriostatic