Microbiology UTA 2460 - Exam 3

Aerobic respiration is an example of...

chemoheterotrophy

Bacteria living in a freshwater stream that are moved to salty seawater would...

become dehydrated due to the loss of water

The antiparallel arrangement within DNA molecules refers to...

one helix that runs from the 5' to 3' direction and the other strand runs from the 3' to 5' direction

When microbes are in a close nutritional relationship, and one benefits but the other is not harmed, it is called...

commensalism

The method of removing vegetative microbial life forms and debris is to reduce contamination to safe levels is termed...

sanitation

Base pairs in DNA are held together by __ bonds...

hydrogen

All of the following pertain to transcription except...

occurs on a ribosome in the cytoplasm

Place the following forms of radiation in order from the most penetrating to the least penetrating...

gamma, X-rays, cathode

The movement of substances from lower to higher concentration across a semipermeable membrane that must have a specific protein carrier and cell expenditure of energy is called...

active transport

Each of the following is a target of antimicrobial agents except...

cytoplasm

Who discovered transposons...

Barbara McClintock

A drug exhibiting which therapeutic index value would be the safest, most effective to use on a patient...

20

Which of the following microorganisms would find hypotonic conditions most detrimental...

protozoa

The shortest time required to kill all the microbes in a sample at a specified temperature is called the...

thermal death time (TDT)

All __ consist of a thiazolidine ring, a beta-lactam ring, and an R group...

penicillins

The development of virulent, toxin-producing bacterial strains due to the presence of a temperate phage can occur through the process of...

specialized transduction

Cultures of a bacterial species were incubated in a refrigerator (5C), on a lab bench top (22C), in a 37C incubator and in a 50C incubator. After incubation, there was no growth at 37C and 50C, slight growth in the refrigerator and abundant growth on the lab bench top. What term could be used for this species...

psychotroph

A chemical that inhibits beta-lactamase enzymes is...

clavulanic acid

Heavy metals work by...

inactivating proteins

Which of the following is not a mode of action of antiviral drugs...

bond to ergosterol in the cell membrane

The alcohol wipe used on a patient's skin before an injection is an example of...

antisepsis

Which is incorrect about inducible operons...

have genes turned off by a buildup of end product

Which of the following does not affect microbial nucleic acids...

moist heat

The phase of the bacterial growth curve in which the rate of multiplication equals the rate of cell death is the...

stationary phase

Cultures of a bacterial species were incubated in a standard incubator, in an anaerobic jar, and in a candle jar. After incubation, there was moderate growth of cultures in the candle and anaerobic jars, but heavy growth of the culture in the incubator. This species is a...

facultative anaerobe

Filtration sterilization...

can remove viruses

Which of the following is not a major element of a microbial cell...

copper

How do aminoglycosides work...

block protein synthesis

If pathogen A is more resistant to an erythromycin disc on a Kirby-Bauer plate compared to pathogen B, then pathogen A will have a __ zone of inhibition compared to pathogen B...

smaller

Surfactants work by...

disrupting membrane integrity

Each of the following results in drug resistance except a drug...

being used as a nutrient by the cell

Which of the following is not true of conjugation...

involves the action of bacteriophage

Which of the following microbial forms has the highest resistance to physical and chemical controls...

bacterial endospores

In the viable plate count method, a measured sample of a culture is evenly spread across an agar surface and incubated. Each __ represents one __ from the sample...

colony, cell

All of the following could find a location in or on body tissues suitable for growth except...

psychrophiles

What type of mutation alters the base but not the amino acid being coded for...

silent

Placing organisms at 4C is...

bacteriostatic

The __ are drugs that deposit in developing teeth and cause a permanent brown discoloration...

tetracyclines

Synthesis of an inducible enzyme requires...

substrate bound to repressor

An organism that uses CO2 for its carbon needs and sunlight for its energy needs would be called a...

photoautotroph

Which is incorrect about purines...

only found in DNA, not in RNA

Which of the following types of control agents would be used to achieve sterility...

sporicide

A clinical microbiologist makes serial dilutions of several antimicrobials in broth, and then incubates each drug dilution series with a standard amount of a patient's isolated pathogen. What is that microbiologist setting up...

minimum inhibitory concentration (MIC) test

An ideal antimicrobial therapeutic drug exhibits all of the following characteristics except...

immediately broken down by host

How do sulfonamides work...

block folic acid synthesis

A superinfection results from...

a decrease in most normal biota resulting in the overgrowth of an unaffected species.

The following pertain to ribosomes during protein synthesis except...

contian codons within their rRNA molecules

A microorganism that does not have catalase or superoxide dismutase would find it difficult to live in an environment with...

oxygen

Each nucleotide is composed of...

one phosphate, one nitrogenous base, and one sugar

Replication of DNA begins at a __ rich area...

adenine-thymine