Microbial Growth

By definition, growth in microbes means:

• Increase in number of cells

• Physical changes

• Chemical changes

• Decrease in number of cells

Tags

NGSS.MS-LS1-5

Requirements for microbial growth are:

• physical

• chemical

• both physical and chemical

• neither physical nor chemical

The bacteria that has optimum growth at the highest temperatures are called:

• psychrophiles

• mesophiles

• thermophiles

• hyperthermophiles

Most bacteria grow best at a pH of:

• 1-3.5

• 6.5-7.5

• 9.5-11.5

• They have no preference

If a solution is HYPERTONIC (high amount of solutes), most microbes:

• shrink

• swell

• are isotonic

• explode

Plasmolysis is:

• shrinking of cells due to water loss

• swelling of cells due to gaining water

• cells remaining isotonic with no negative water loss or gain

• none of the above

What are superoxide dismutase, catalase, and peroxidase?

• Enzymes needed by aerobic organisms for life

• Enzymes needed by anaerobic and anaerobic organisms for life

• Minerals needed by all living things

• None of the above

Tags

NGSS.HS-LS2-3

Sulfur and phosphorus:

• Are good for living things, but not required

• Are enzymes needed for growth

• Are critical elements needed for microbial growth

• Are poisonous in low amounts

Microbes that adhere to surfaces, are resistant to antibiotics, and form on teeth, contact lenses, and catheters are called:

• diatoms

• enzymes

• anaerobic bacteria

• biofilms

Tags

NGSS.HS-LS2-6

Any material prepared for the growth of bacteria in a lab is called:

• culture media

• culture

• media

• microbe