Microbiology quiz 1 ( Part 2 )

How do we study microbes and all the jazz?

Complex media is harder to make and every single ingredient is measured.

General Media has which of the following characteristics?

Enrichment media has which of the following characteristics/example(s)?

[blank_start]Selective[blank_end] media selects for certain bacteria and selects against other bacteria.

Differential media usually is dependent on bacterial metabolic activity.

Differential media is not similar or at all like selective media.

Choose the correct terms for the following characteristics of autoclaving. Autoclaving uses high [blank_start]pressure[blank_end] and high temperature to kill even [blank_start]endospores[blank_end]. [blank_start]Wet[blank_end] heat has more energy than dry heat. This kills everything but can be [blank_start]bad[blank_end] for delicate or reactive compounds. Autoclaving can also cause [blank_start]vitamins[blank_end] to [blank_start]denature[blank_end]. Also, trace metals that are [blank_start]redox[blank_end]-sensitive might react and become unavailable.

If autoclaving can denture vitamins and ruin or cause trace metal react, then what is another method of sterilization that would be better suited to handle this problem?

Which of the following is TRUE about filtered sterilization?

Which is not a form of UV light sterilization?

Order the strength of UV light sterilization in increasing order in terms of effectiveness of killing microbes: 1) Lowest --> [blank_start]UV-A[blank_end] 2) Medium --> [blank_start]UV-B[blank_end] 3) Highest --> [blank_start]UV-C[blank_end]

UV-A is the least effective in killing microbes but has the deepest penetrance. UV-C is the most effective in killing microbes but has the lowes penetrance.

Hypothermiphiles and thermophiles grow in [blank_start]hot[blank_end] environments. Psychrophiles grow in [blank_start]cold[blank_end] environments. Halophiles love [blank_start]salt[blank_end]. Osmophiles love [blank_start]sugar[blank_end]. Xerophiles grow in [blank_start]dry[blank_end] environments.

What is true about thermophiles?

The closer to 1, the purer the water solution.

Why do we use salt and sugar in food preservation?

We can use microbes to preserve our food by them producing acid. This method of food preservation is called?

Canned fruits naturally have higher acid than canned meat or vegetables as they have naturally occurring acidity prevents the growth of this bacteria.

What is pasteurization?

What is true about anaerobes?

Which type of organism contains a protein-free manganese complex instead of superoxide dismutase?

Aerobes and facultative aerobes always have [blank_start]superoxide dismutase[blank_end] and [blank_start]catalase[blank_end].

Some aerotolerant organisms have [blank_start]protein-free manganese complexes[blank_end] instead of [blank_start]superoxide dismutase[blank_end]

Obligate anaerobes have [blank_start]superoxide[blank_end] [blank_start]reductase[blank_end] instead of [blank_start]superoxide[blank_end] [blank_start]dismutase[blank_end].

Which of these organisms utilize oxygen as a terminal electron acceptor?

Bacteriocidal [blank_start]kills[blank_end] the bacteria, bacteriostatic [blank_start]stops[blank_end] bacterial growth, and bacteriolytic [blank_start]destroys[blank_end] the cells.

[blank_start]Sterilants[blank_end] destroy all microorganisms including endospores [blank_start]Disinfects[blank_end] are used on surfaces to kill microorganisms but not necessarily endospores [blank_start]Sanitizers[blank_end] reduce microbial numbers but do not sterilize [blank_start]Antiseptics[blank_end] kill or inhibit microbial growth, but are non-toxic enough to be applied to living tissue