Chapter 6 Microbial Growth

What results when a single bacterium reproduces?

If you begin with 6 bacterial cells how many cells will you have after 3 rounds of division?

Which of the following is NOT a step in bacterial cell division? Splitting apart of two new daughter cells Disappearance of nuclear envelope Cell elongation Replication of the genetic material

Which step of binary fission is the reason for genetically identical daughter cells?

What would happen if the septum did not form during binary fission?

Which of the following statements regarding infections involving biofilms is FALSE? -The majority of hospital acquired infections (nosocomial infections) are related to biofilms. -It is estimated that nearly 70% of all infections are caused by biofilms. -Microbes in biofilms are 1000x more resistant to antimicrobials than are independent organisms. -There is no way to prevent biofilms from developing on surfaces.

Microbes have very narrow optimum temperature ranges. Which of the following classifications of microbes are most likely to cause human disease, based on temperature requirements? psychrophiles thermophiles mesophiles hyperthermophiles

Which of the following statements accurately describes the culture media necessary for growing Clostridium tetani? Nutrient agar contains ingredients that combine with oxygen and remove it, creating an anaerobic environment. A chemically defined medium is one made up of extracts such as those from yeasts, meat, or plants whose exact chemical composition may vary slightly. A complex medium is one whose exact chemical composition is known. Reducing media are complex media containing chemicals, such as thioglycolate, that combine with oxygen, creating an anaerobic environment.

What types of microbes would a microbiologist use culture techniques for living host cells?

Bacteria that can grow in the presence or absence of Oxygen are called:

The addition of what to a culture medium will neutralize acids?

Salts and sugars work to preserve foods by creating a

Pathogenic bacteria isolated from the respiratory or intestinal tracts of humans are

A culture medium on which only gram-positive organisms grow and a yellow hallow surrounds Staphylococcus aureus colonies is called a(n)