Microbiology Questions

Which of the following statements is INCORRECT regarding prokaryotic cells?A) Their DNA is not enclosed within a membrane.B) they lack membrane-enclosed organellesC) They typically have a circular chromosomeD) They reproduce by binary fission. a plasma membrane.E) They lack a plasma membrane

The sulfa drugs work by _______ with PABA in making folic acid.A) positive feedbackB) negative feedbackC) competitive inhibitionD) allosteric inhibition

Robert Koch identified the cause ofA) smallpox.B) anthrax.C) diphtheria.D) AIDS.E) Influenza

Which of the following is an example of proper laboratory technique?A) Pipette by mouth only when transferring broth culturesB) Lick labels before adhering them to culture tubesC) Place bacteria cultures into the trash can as soon as you are finished with themD) Wear disposable gloves, lab coat and if necessary facial protection when working with microbes or chemicals

Which of the following antibiotics interfere with cell wall synthesis?A) sulfonamidesB) macrolidesC) cephalosporinsD) tetracyclinesE) quinolones

In agglutination reactions, the antigen is a ___, in precipitation reactions it is a ____A ) whole cell, soluble moleculeB) Soluble molecule/Whole cellC) Bacterium/VirusD) Protein/CarbohydrateE)Protein/Antibody

What is the primary purpose of keeping doors and windows closed during the laboratory:A) To reduce the incidence of contamination from microbes travelling in the airB) To reduce noise levelsC) To maintain the temperature within the optimal growth range for the bacterial cultures

The birth of modern chemotherapy is credited to the efforts ofA) Alexander FlemingB) Paul EhrlichC) Robert KochD) Louis Pasteur

Trimethoprim does what?A) Injury to plasma membraneB) Inhibition of protein synthesisC) Inhibition of cell wall synthesisD) Inhibition of synthesis of essential metabolites

More than half of our antibiotics are produced by species ofA) Mycobacterium.B) Streptomyces.C) Clostridium.D) Bacillus.

If two organisms have similar rRNA sequences, you can conclude that theyA) live in the same place.B) will have different G-C ratios.C) evolved from a common ancestor.D) mated with each other.

Microorganisms are involved in each of the following processes EXCEPTA) infection.B) decomposition of organic material.C) food production.D) smog production

Why does immersion oil improve resolution?a. It decreases the working distance.b. It allows light to travel at a uniform speed on its way to the lens.c. It increases the angle of refraction of the light

What is usually the role of fungi in ecosystem?a) Consumersb) Parasitesc) Decomposersd) They don't have a role

A plate count method in which inoculums is spread over the surface of a solid culture mediuma) streak plate methodb) pour plate methodc) spread plate methodd) filtration method

Which of the following antibiotics does NOT interfere with cell wall synthesis?A) cephalosporinsB) macrolidesC) naturalpenicillinsD) semisyntheticpenicillinsE) vancomycin

Conidia are multinucleate spores produced ina) Gametangia. b) basidia c) sporanhiad) Ascuse) None of the above

The major significance of Robert Koch's work is that :A) microorganisms are present in a diseased animalB) diseases can be transmitted from one animal to another, C) microorganisms can be cultured. D) microorganisms cause disease. E) microorganisms are the result of disease

Biochemical tests are used to determineA) enzymatic activities of microorganismsB) nucleic acid basecomposition

What are they inverted tubes called in the fermentation of carbohydrate tubes and what is the function of this tubes?a) Centrifuge tubes, collects the bacterial precipitateb) PCR micro tubes , for DNA isolationc) Reaction tubs, used to culture bacterial straind) Durham tubes, collect gas products during fermentation