Labs 7, 8, 9 Prelabs

When plating out a serial dilution series, which dilution would have the fewest colony forming units?

1:10,000,000

A dilution of 1:1,000,000 is equivalent to 10 to which exponent?

6

A dilution of 1:10,000,000 is equivalent to 10 to which exponent?

7

Cell division for bacteria is known as

Binary Fission

In this phase, limiting factors intensify becoming detrimental to any cell growth.

Death Phase

In this phase, the cells are adjusting to the environment.

Lag Phase

Generation time should be measure during which phase?

Log Phase

In this phase, the cells reach the maximum rate of cell division.

Log Phase

tetracycline targets

Protein synthesis

Question 5. Which bacteria's colonies change color from white (higher temperature) to red (lower temperature)

Serratia

In this phase, cells will stop growing or grow very slowly.

Stationary Phase

An increase in the optical density or absorbance indicates ______ microbial organisms.

an increase in the number of

Substances that inhibit or kill microorganisms but are gentle enough to apply to living tissue are

antiseptics

Antimicrobials are compounds that kill or inhibit

any type of microorganisms

Antibiotics are compounds that kill or inhibit

bacteria

Chemical agents that are applied to inanimate objects to kill microorganisms are

disinfectants

Question 2. Bacteria that have a flexible metabolism for oxygen conditions

facultative anaerobes

Question 9. A cell that has more solutes than its environment is

hypertonic

Question 7. A cell that has fewer solutes than its environment is

hypotonic

Question 8. A cell that has the same solute concentration as its environment is

isotonic

Question 4. Many bacteria pathogen have an optimal growth between 35ºC and 40ºC are classified as

mesophiles

Question 1. Bacteria that must grow in oxygen because their metabolism requires oxygen

obligate aerobes

Question 10. A microbe such as Halobacterium salinarium thrives in high salt concentration environment is known as a

obligate halophiles

Question 3. Bacteria that cannot grow in an oxygenated environment

obligates anaerobes

Chloramphenicol targets

protein synthesis

Streptomycin targets

protein synthesis

Bacitracin targets

the cell wall

Penicillin targets

the cell wall

Question 6. pH refers to what?

the concentration of hydrogen ions

Antivirals are compounds that kill or inhibit

virsuses