FREE AND STUDY GAMES ABOUT MICRO CH. 3,4,7 EXAM

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FREE AND STUDY GAMES ABOUT MICRO CH. 3,4,7 EXAM

QUESTIONS

Actual Qs and Ans Expert-Verified Explanation

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-Guarantee passing score -178 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation

Question 1: Which Carbon and Energy Source Categories do MOST MICROBES, all

animals, fungi, protozoans, and most bacteria fall into?

Answer:

ChemoHETEROtrophs - they derive both their CARBON SOURCE and their ENERGY SOURCE from organic compounds.Question 2: Where are alkalinophiles found:

Answer:

Hot pools and soils that contain high levels of basic materials (UP TO 10 pH) Question 3: The name of the way microbes established in biofilms communicate through complex chemical messages?

Answer:

Quorum Sensing Question 4: The intermediate temperature bw the maximum and minimum temperature that

promotes the fastest rate of growth and metabolism is:

Answer:

Optimal Temperature

Question 5: What is the optimal range of growth for a psychrophile?

Answer:

Below 15 degrees Celsius; Can still grow at 0 degree Celsius Question 6: Metabolism of aerobes:

Answer:

Aerobic Respiration, Oxygenic, Anoxygenic, Photosynthesis

Question 7: Why does the curve level off in the Stationary Phase

Answer:

Because the rate of cell death / cell inhibition balances out the rate of cell multiplication.Question 8: Which carbon and energy group can survive completely on inorganic substances, such as minerals?

Answer:

ChemoAUTOtrophs Question 9: The length of a generation time is a measure of the growth rate of an organism.

Answer:

The length of a generation time is a measure of the growth rate of an organism.Question 10: In bacteria, each generation time increases the population by a factor of:

Answer:

• (each generation DOUBLES the population)

after 4 generations there will be: 2^4 cells total.

Question 11: Characteristics of Gram Positive walls:

Answer:

Contain Teichoic Acid Thick peptidoglycan layer Question 12: The number of the exponent is the:

Answer:

Number of the generation

Question 13: What are the two enzymes that are required of aerobic microbes?

Answer:

Superoxide DISMUTASE (for the superoxide) and Catalase (for newly converted Hydrogen Peroxide H2O2)

Question 14: Advantage of direct microscope count

Answer:

No incubation time is required; can do it if your pressed for times Question 15: Aerobes:

Answer:

Possess the defense mechanisms against the toxins of oxygen and have adapted to using oxygen Question 16: A microbe breaks down a substance that would be toxic or inhibitory to another microbe. What kind of relationship is this?

Answer:

Commensalism - one member is benefited

Question 17: What is parasitism?

Answer:

The host organism provides the parasitic microbe with nutrients and a habitat. Multiplication of the parasite usually harms the host to some extent.Question 18: What is the name of a microbe that grows optimally in 25 degrees Celsius?

Answer:

Mesophile (Optimum temperature is between 20 - 40 degrees Celsius) Question 19: What could be good for evaluating the relative amounts of cell growth?

Answer:

Turbidity

Question 20: What is the optimal range of growth for a thermophile?

Answer:

45-80 degrees Celsius

Question 21: What exactly do acidity and alkalinity effect in a cell?

Answer:

The ACTIVITY AND integrity of the enzymes and THE STRUCTURAL COMPONENTS of a cell.Question 22: What is the name of a microbe that grows optimally in 75 degrees Celsius?

Answer:

Thermophiles Question 23: Does a culture in the stationary phase have enough nutrients to continue multiplying?

Answer:

NO

Question 24: What is a cells generation time?

Answer:

The time it takes for a binary division to occur where a parent cell splits into two daughter cells.

Question 25: Why do most microbes live in "calm" pH levels?

Answer:

Because strong acids and bases can be damaging to the enzymes and other cellular substances.

Question 26: Log Phase will continue for how long?

Answer:

As long as cells have adequate nutrients and there are favorable conditions

Question 27: What are some contributing factors of the Stationary Phase?

Answer:

Depletion of nutrients Depletion of oxygen Increased cell density --> causes accumulation of organic acids and toxic biochemicals

Question 28: Plate Count

Answer:

Only way to measure viable/live cells - TAKES TIME Each colony represents a cell from the sample population