Lab 5: Streak Plates and Cultural Characteristics

How many times do you obtain the inoculum when performing an isolation streak?

• One time if your inoculum is a solid, and five times if your inoculum is a broth

• One time

• Three times

• Four times - once in all four quadrants

In what position do we incubate a streak plate?

• 
• 
• It does not matter what position the plate is in, as long as it is in the back of the incubator.

• Streak plates are not incubated at all

What is the purpose of a streak plate?

• Streak plates are made in order to see pigments

• To plate and count the number of colony forming units in a broth

• To isolate colonies using mechanical dilution

• To test for aero-tolerance

The image shows an example of a(n):

• Streak plate

• Spread plate

• Ordinary inoculation

• Stroke inoculation

Which of the following are NOT considered colony margin characteristics?

• Undulate or lobate

• Erose

• Entire

• Punctiform or circular

Round colonies less than 1.5mm in diameter are called:

• Circular

• Irregular

• Rhizoid

• Punctiform

Round colonies greaher than 1.5mm in diameter are called:

• Punctiform

• Circular

• Irregular

• Rhizoid

Colony margins that display an uneven waviness, like the picture are called:

• Erose

• Entire

• Undulate

• Lobate

Even colony margins like the bacteria pictured here are called:

• Lobate

• Entire or complete

• Undulate

• Erose

Broth characteristic where bacteria can be seen throughout the culture - the culture appears "cloudy".

• Sediment

• Pellicle

• Turbid

• Ring