BIO 299 Exam 1 Questions and Correct Answers Updated Version _____ has the same optical qualities as glass and thus prevents refractive loss of light as it passes from the slide to the objective lens. - Correct AnswerImmersion oil
A client has a serious respiratory infection. A random sample of sputum was taken from the patient coughing up blood. The lab technician said they had isolated a bacterium that did not have any peptidoglycan. You hypothesize that the identity of this microbe could possibly be - Correct AnswerMycoplasma pneumoniae.
A common medium used for growing fastidious bacteria is - Correct Answerblood agar.
A few antibiotics target cell membranes of cells, blocking the incorporation of chemicals into sterol molecules for the cell membrane. Which statement is true? - Correct AnswerBacteria would be unaffected by those specific antibiotics (with very few exceptions).
A microbiologist inoculates Staphylococcus aureus into a culture medium. Following incubation, both Staphylococcus aureus and Staphylococcus epidermidis are determined to be growing in this culture. What is the most likely explanation? - Correct AnswerThe culture is contaminated
A microbiologist inoculates Staphylococcus epidermidis and Escherichia coli into a culture medium. Following incubation, only the E. coli grows in the culture. What is the most likely explanation? - Correct AnswerThe culture medium must be selective
A microbiologist makes a fixed smear of bacterial cells and stains them with Loeffler's methylene blue. All the cells appear blue under the oil lens. This is an example of - Correct Answersimple staining
A nutrient binds to receptors near the basal body. This will result in - Correct Answercounterclockwise rotation of flagella.
A sample of E. coli has been isolated and cultured from three different individuals.However, upon further testing of these three cultures, you find that there are variations among the three as to biochemical test reactions. What is your hypothesis as to why this has occurred? - Correct AnswerThis is just the normal genetic variation seen among strains of a particular species of bacterium.
A scientist studying the sequence of nucleotides in the rRNA of a bacterial species is working on - Correct Answerdetermining evolutionary relatedness.
Adulthood and mating of helminths occur in which host? - Correct Answerdefinitive host
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After staining your patient's specimen, an aspirate from the lungs, by the acid-fast stain method and focusing on the specimen, you find a large population of hot pink-red bacillus shaped bacteria in the smear. Which statement is true? - Correct AnswerIn all likelihood, the patient has tuberculosis
All of the following are diameters of cells that would be resolved in a microscope with a limit of resolution of 0.2µm except - Correct Answer0.1 µm.
All of the following structures contribute to the ability of pathogenic bacteria to cause disease except the - Correct Answerinclusions.
Analysis of the small subunit rRNAs from all organisms in the three current domains suggests that - Correct Answerall modern and extinct organisms on earth arose from a common ancestor.
At present, the most accurate indicator of evolutionary relatedness among organisms is to determine the - Correct Answernitrogen base sequence of rRNA.
Biologists have found evidence that eukaryotic cells evolved from prokaryotic organisms by a process of intracellular - Correct Answersymbiosis.
Chemical analysis of a bacterial cell structure detects calcium dipicolinic acid. What is the identity of this structure? - Correct Answerendospore
During unfavorable growth conditions, many protozoa can convert to a resistant, dormant stage called a/an - Correct Answercyst.
Eosin-methylene blue agar, or EMB, is a commonly used bacteriological medium in a lab, used to grow gram-negative bacteria. There are two dyes in it, eosin and methylene blue, as well as the sugar lactose. Eosin is a pH indicator that changes color when the medium is acidic, while methylene blue reduces the growth of most gram-positive bacteria. If an organism uses lactose, acid will be produced changing the pH of the medium and subsequently causing the bacterial colonies to change color. Based upon
this description, this medium is: - Correct Answerdifferential and selective
Eukaryotic flagella differ from prokaryotic flagella because only eukaryotic flagella - Correct Answercontain microtubules.
Experimentation - Correct Answerprovides a meCorrect Answerto gather objective data.
f a microbiologist is studying a specimen at a total magnification of 950X, what is the magnifying power of the objective lens if the ocular lens is 10X? - Correct Answer95X
f bacteria living in salty seawater were displaced to a freshwater environment, the cell structure that would prevent the cells from rupturing is the - Correct Answercell wall
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