Microbiology Chapter 9
(Openstax)Questions and Answers.
binary fission - Answer ("division in half") is a kind of asexual reproduction. It is the most
common form of reproduction in prokaryotes and occurs in some single-celled eukaryotes. The
fully grown parent cell splits into two halves, producing two new cells.
Generation time - Answer is the time it takes for a cell to divide
colony (CFU) - Answer Colony Forming Unit, Growth is exponential and results in an isolated of
cells
Direct Count - Answer counts bacteria using a specially made slide, the slide has a grid and for
each bacteria in the grid that's how you count.
Serial dilution - Answer _______________ involves diluting a fixed volume of cells mixed with
dilution solution using the previous dilution as an inoculum. The result is dilution of the original
culture by an exponentially growing factor.
2 Bacteria makes a... - Answer colony
Plate dilution - Answer uses warmed agar to dilute rather than diluting solution
Drinking Water - Answer Very dilute samples such as ______________ use filtration to count
bacterial cells.
A known volume of water is filtered through a membrane that traps the bacteria. The filter is
then laid on agar to grow. Use the CFU number to extrapolate the number of bacteria in the
original volume of water.
Turbidity - Answer The cloudiness of the growth of the bacteria
Biofilms - Answer A group of bacteria that will stick to an inert (nonliving) surface in the body;
highly structured ecosystem of numerous species of microbes growing on a surface.
ex: plaque on teeth, bacteria on a knee replacement, causes a problem for screws for the
replacement
(Openstax)Questions and Answers.
binary fission - Answer ("division in half") is a kind of asexual reproduction. It is the most
common form of reproduction in prokaryotes and occurs in some single-celled eukaryotes. The
fully grown parent cell splits into two halves, producing two new cells.
Generation time - Answer is the time it takes for a cell to divide
colony (CFU) - Answer Colony Forming Unit, Growth is exponential and results in an isolated of
cells
Direct Count - Answer counts bacteria using a specially made slide, the slide has a grid and for
each bacteria in the grid that's how you count.
Serial dilution - Answer _______________ involves diluting a fixed volume of cells mixed with
dilution solution using the previous dilution as an inoculum. The result is dilution of the original
culture by an exponentially growing factor.
2 Bacteria makes a... - Answer colony
Plate dilution - Answer uses warmed agar to dilute rather than diluting solution
Drinking Water - Answer Very dilute samples such as ______________ use filtration to count
bacterial cells.
A known volume of water is filtered through a membrane that traps the bacteria. The filter is
then laid on agar to grow. Use the CFU number to extrapolate the number of bacteria in the
original volume of water.
Turbidity - Answer The cloudiness of the growth of the bacteria
Biofilms - Answer A group of bacteria that will stick to an inert (nonliving) surface in the body;
highly structured ecosystem of numerous species of microbes growing on a surface.
ex: plaque on teeth, bacteria on a knee replacement, causes a problem for screws for the
replacement
