FREE NURSING AND STUDY GAMES ABOUT MICRO EXAM

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FREE NURSING AND STUDY GAMES ABOUT MICRO EXAM

CH6 Actual Qs and Ans Expert-Verified Explanation

This Exam contains:

-Guarantee passing score -117 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation

Question 1: PO43- (phosphate ion) is a source of what element?

Answer:

Phosphorus Question 2: What bacteria can double every 20 minutes under favorable conditions?

Answer:

• coli

Question 3: What is a medium that extracts and digests of yeasts, meat, or plants?

Answer:

Complex media

Question 4: What are some indwelling medical devices that biofilms form on?

Answer:

Mechanical heart valves, catheters, etc.

Question 5: What is one of the toxic oxygens that is normal molecular oxygen (O2) that has been boosted into a higher-energy state and is extremely reactive

Answer:

Singlet oxygen (1O2-) Question 6: This is the lowest temperature at which a microbial species will grow best

Answer:

Minimum growth temperature

Question 7: What are the three direct methods of measuring microbial growth?

Answer:

Plate counts, microscopic count, filtration

Question 8: What are the physical requirements for microbial growth?

Answer:

Temperature, pH, and osmotic pressure Question 9: In what direct method of measuring microbial growth is a measured volume of a bacterial suspension placed within a defined area on a microscope slide?

Answer:

Direct microscopic count Question 10: What element is used to synthesize sulfur-containing amino acids and vitamins such as thiamine and biotin?

Answer:

Sulfur

Question 11: Cold-loving microbes

Answer:

Psychrophiles Question 12: Hypertonic environments, or an increase in salt or sugar, cause _____

Answer:

Plasmolysis

Question 13: What two elements does protein synthesis require?

Answer:

Nitrogen and sulfur Question 14: What direct method of measuring microbial growth requires at least 100 ml of water to be passed through a thin membrane filter whose pores are too small to allow bacteria to pass?

Answer:

Filtration

Question 15: An estimated __% of human bacterial infections involve biofilms

Answer:

70% Question 16: What are microbes that grow better at high CO2 concentrations called?

Answer:

Capanophiles Question 17: In what plate count method does one inoculate the empty plate, add melted nutrient agar, swirl to mix, and do colonies grow on and in solidified medium?

Answer:

Pour plate method

Question 18: What temperature does agar solidify at?

Answer:

40°C Question 19: Microbes require very small amounts of other mineral elements; these are referred to as ____ _____

Answer:

trace elements Question 20: What is the first phase of bacterial growth with intense activity preparing for population growth, but no increase in population and can last for 1 hour or several days?

Answer:

Lag phase

Question 21: Some important bacteria, including many of the photosynthesizing cyanobacteria, use gaseous nitrogen (N2) directly from the atmosphere in the process called ______ ______

Answer:

Nitrogen fixation Question 22: What medium is used as solidifying agent for culture media in Petri plates, slants, and deeps?

Answer:

Agar Question 23: What is a population of cells arising from a single cell or spore (or from a group of attached cells)?

Answer:

Colony Question 24: What media are designed to suppress the growth of unwanted bacteria and encourage the growth of the desired microbes?

Answer:

Selective media

Question 25: What two containers are used to grow bacteria?

Answer:

Test tubes and petri dishes Question 26: Because anaerobes might be killed by exposure to oxygen, special media called ______ ____ must be used. These media contain ingredients, such as sodium thioglycolate, that chemically combine with dissolved oxygen and deplete the oxygen in the culture medi

Answer:

Reducing media Question 27: What is the fourth phase of bacterial growth where the population is decreasing at a logarithmic rate?

Answer:

Death phase