Ch. 6 Micro

A colony-forming unit is a __________. A.)tool used to collect clinical specimens B.)special type of growth medium C.)commonly used isolation technique D.)single cell or group of related cells that gives rise to a colony

Which type of media is used to prevent the growth of certain microbes while allowing the growth of others? A.)selective media B.)enriched media C.)differential media D.)reducing media

A chemoheterotroph obtains its energy from __________ and its carbon from __________ sources. A.)light; inorganic b.)light; organic C.)redox reactions; organic D.)redox reactions; inorganic

The most commonly used isolation technique in microbiology laboratories is the __________. A.)streak-plate method B.)viable plate count method C.)enrichment culture D.)pour-plate method

Which of the following does NOT use an inorganic source of carbon as its sole source? A.)a photoheterotroph B.)a chemoautotroph and a chemoheterotroph C.)a photoautotroph D.)a chemoautotroph

Nitrogen is a growth-limiting nutrient because cells need it to manufacture __________. A.)proteins and lipids B.)proteins and nucleotides C.)carbohydrates and nucleotides D.)lipids and carbohydrates

Blood agar is an example of which of the following? A.)a complex medium B.)a complex medium and a selective medium C..)a differential medium D.)a differential medium and a complex medium

Which of the following represent the majority of pathogenic bacteria? A.)mesophiles B.)psychrophiles C.)hyperthermophiles D.)thermophiles

What results when a single bacterium reproduces? A.)One parent cell and a genetically identical daughter cell B.)One parent cell and a genetically different cell C.)Two genetically unique daughter cells D.)Two genetically identical daughter cells

Which of the following is NOT a step in bacterial cell division? A.)Replication of the genetic material B.)Splitting apart of two new daughter cells C.)Disappearance of nuclear envelope D.)Cell elongation

Which step of binary fission is the reason for genetically identical daughter cells? A.)Elongation of the cell B.)There are four new daughter cells that result from one parental cell C.)Replication of the bacterial chromosome D.)Splitting of the two daughter cells

What enables the copied chromosomes to separate during binary fission? A.)The mitotic spindle drives the separation. B.)The nuclear membrane dissolves. C.)The septum splits the replicated chromosomes. D.)The chromosomes are attached to different parts of cell membrane, which elongates and thus separates the chromosomes.

Put the following steps of bacterial replication in the correct order, starting from a parent cell. Cell elongation Septum formation Chromosome replication Separation of daughter cells A.)1, 4, 3, 2 B.)3, 2, 1, 4 C.)2, 4, 3, 1 D.)3, 1, 2, 4 E.)4, 3, 1, 2

A chemoheterotroph obtains its energy from __________ and its carbon from __________ sources. A.)redox reactions; inorganic B.)light; inorganic C.)redox reactions; organic D.)light; organic

Which of the following does NOT use an inorganic source of carbon as its sole source? A.)a photoheterotroph B.)a chemoautotroph C.)a photoautotroph D.)a trophozoite

Which two groups are a source of carbon? A.)Autotrophs and phototrophs B.)chemotrophs and heterotrophs C.) heterotrophs and autotrophs D.) chemotrophs and phototrophs

What are the three emzymes?

If temperature is too low, it will affect membrane how?

Out of the four categories, which two have the most extreme environments? A.)mesophiles B.) thermophiles C.) psychrophiles d.)hyperthermophiles

Barophiles live under______pressure.

Which of the following are NOT characteristics of biofilms? A.)They attach onto surfaces B.)cells in biofilms will communicate and coordinate with one another C.) Many microorganisms are less harmful as a part of a biofilm D.) protection from antimicrobial drugs

Which of the following is NOT a characteristic of binary fission? A.) The exchange of DNA between two cells B.)a way that some organisms create energy C.)the fusion of two cells to create a new, smaller cell D.) a process in which a cell grows and divides to produce two new daughter cells