Dynamics of Prokaryotic Growth Part 1

You gather a sample of 50 bacteria. The generation time for this organism is 40 minutes. How many bacteria will be in your sample after 2 hours?

• 500
• 200
• 350
• 400

You gather a sample of 20 bacteria. The generation time for this organism is 60 minutes. How many bacteria will be in your sample after 2 hours?

• 40
• 120
• 200
• 80

In microbiology, what is a pure culture?

• A pure culture is a culture containing multiple types of microorganisms.
• A pure culture is a culture containing only one type of microorganism.
• A pure culture is a culture containing only viruses.
• A pure culture is a culture containing both living and non-living organisms.

In bacteria, superoxide dismutase is used to ___ and catalase is used to ___.

• convert superoxide radicals into oxygen and hydrogen peroxide, break down hydrogen peroxide into water and oxygen
• produce hydrogen peroxide from oxygen and water
• break down superoxide radicals into water and oxygen
• convert hydrogen peroxide into superoxide radicals and oxygen

What is a polysaccharide substance produced by bacteria to aid in survival and colonization?

• Extracellular matrix
• Antibiotic
• Probiotic
• Biofilm

What was Robert Koch's major contribution to microbiology?

• Developing antibiotics

• Developing the germ theory of disease

• Developing pasteurization techniques

• Development of pure culture techniques

What is the phrase used to describe bacterial movement?

• amebic motility

• binary fission

• run and tumble

• gyration

When would antibiotic resistance be seen in the bacterial growth curve?

• Early log phase

• Late log phase

• Decline phase
• Exponential phase