part 2 microbiology chapter 1 study

Which of the statements regarding chemoorganoheterotrophs is/are correct?

They use preformed organic molecules as a carbon source AND as an energy source

Prokaryotic cells divide by a process known as

binary fission

During which phase of the bacterial growth curve does a bacterial population become much more resistant to harmful conditions

Late log phase

Which of the statements about biofilms is TRUE? 

Biofilms may protect organisms against harmful chemicals

Organisms that are indifferent to the presence of oxygen and do not use it are

aerotolerant anaerobes

You leave several tomatoes in your refrigerator when you go on vacation. When you get home, the tomatoes are covered

You leave several tomatoes in your refrigerator when you go on vacation. When you get home, the tomatoes are covered in microbial growth. Select the best description for these microbes.

They are acidophilic, psyhrotrophic aerobes

The prefix photo- in the term photoautotroph indicates that an organism will make use of _________blank for energy purposes.

light

Pasteurization results in the sterilization of food products.

False

Which of the following pieces of medical equipment requires sterilization

Scalpel

The only protective gear required for working in a BSL-4 laboratory is a lab coat

False

A suffix used to describe a killing action would be

-cidal

The endospores of Pseudomonas make that organism very difficult to kill

The endospores of Pseudomonas make that organism very difficult to kill.

False

When treated with heat or chemicals, bacteria will

die at a constant rate

Gamma rays cause biological damage in living systems by

producing reactive molecules such as superoxide

Moist heat kills microorganisms by

irreversible denaturation of proteins

The process of killing or removing all of the microorganisms in or on a material is called

sterilization

Chlorhexidine

is extensively used in antiseptics

The more bacteria one starts with, the longer it will take to kill them all

True

You work in a BSL-4 laboratory. What type of organism do you work with in this setting

Easily transmitted pathogen likely to cause fatal disease

Which statement regarding phenolics is TRUE?

They denature proteins and destroy cytoplasmic membranes