Microbiology (Dr. AL, LSUE) Exam 2

Microbiology (Dr. AL, LSUE) Exam 2 Questions And 100% Correct Answers ________ were first identified in cancer-causing viruses and can induce ________ in infected cells. - B) Oncogenes; transformation ______________ are a diverse group of eukaryotic organisms that are similar in rRNA sequences, but quite different from each other in motility types and ecology. They have been used previously as a "catch-all" for organisms that couldn't be easily classified into other groups. - A) Protists 27) A definitive host harbors which stage of a parasite? - C) adult A bacterial culture grown in a glucose-peptide medium causes the pH to increase. The bacteria are most likely - C) using the peptides A bacterial species differs from a species of eukaryotic organisms in that a bacterial species - D) is a population of cells with similar characteristics A bacterium such as Pseudomonas uses nitrate as a final electron acceptor in an electron transport system. All below statements are true EXCEPT - C) they require light A bacterium that only possesses that ability to ferment obtains energy - A) by glycolysis only A biochemical test, in microbiology world, is used to determine - D) capability of a microbe to perform a specific enzymatic activity A biochemical test, in the microbiology world, is used to determine - D) capability of a microbe to perform a specific enzymatic activity A biological control method to reduce the reproductive success of mosquitoes involves the use of - E) Wolbachia A clear area against a confluent "lawn" of bacteria is called a - D) plaque. A clone is - A) genetically identical cells derived from a single cell A culture medium consisting of agar, peptone, and beef heart is a - B) complex medium A feature that may be found in viruses but never in bacteria is - B) may contain an RNA genome. A genus can be best defined as - B) a taxon composed of one or more species and a classification level lying below family A lytic virus has infected a patient. Which of the following would best describe what is happening inside the patient? - A) The virus is causing the death of the infected cells in the patient. A persistent infection is one in which - C) the disease process occurs gradually over a long period A persistent infection is one in which - C) the disease process occurs gradually over a long period. A primary difference between cyanobacteria and purple and green photosynthesizing bacteria is - C) electron donor for CO2 reduction A sample of milk is tested for its bacterial content in a plate count assay. A one milliliter sample of milk is diluted in a 1:10 dilution series. One milliliter of the third dilution tube is plated in a pour plate. After incubation, the plate has 54 colonies, indicating that the original milk sample contained - D) 54,000 cells per milliliter A sample of ocean water is tested for its bacterial content in a plate count assay. A one milliliter sample of the water is diluted in a 1:10 dilution series. 0.1 milliliter of the second dilution tube is plated in a pour plate. After incubation, the plate has 191 colonies, indicating that the original water sample contained - D) 191,000 cells per milliliter A sample of raw, unpasteurized milk is tested for its bacterial content in a plate count assay. A one milliliter sample of the milk is diluted in a 1:10 dilution series. One milliliter of the third dilution tube is plated in a pour plate. After incubation, the plate has approximately 500 colonies, indicating that the original milk sample contained - E) the answer cannot be determined reliably with the information given A sample of well water is tested for its bacterial content in a plate count assay. A one milliliter sample of the water is diluted in a 1:10 dilution series. One milliliter of the fourth dilution tube is plated in a pour plate. After incubation, the plate has 83 colonies, indicating that the original water sample contained - E) 830,000 cells per milliliter A segmented genome can result in antigenic shift. (TRUE or FALSE) - TRUE A urease test is used to identify Mycobacterium tuberculosis because - B) M. tuberculosis produces urease A viral species is a group of viruses that - B) has the same genetic information and ecological niche A viroid is a completely developed infectious agent composed of nucleic acid and surrounded by a capsid. (TRUE or FALSE) - FALSE A viroid is a(n) - B) infectious piece of RNA without a capsid. A virus's ability to infect an animal cell depends primarily upon the - B) presence of receptor sites on the cell membrane A wolf kills a deer that is infected with ________ of Echinococcus granulosis in its liver and eats it. After consuming the deer, the wolf's intestine becomes filled with a number of ________ produced from scoleces. These eventually release eggs into the wolf's intestines, which are released in its feces. - A) hydatid cysts; proglottids Actinomycetes differ from fungi in that actinomycetes - B) lack a membrane-bound nucleus All gram-negative bacteria are classified as proteobacteria. (TRUE or FALSE) - FALSE All of the follow gin are required in the reactions of microbial respiration EXCEPT - D) oxygen All of the following are characteristic of algae EXCEPT which ONE of the following? - B) They are currently classified as plants. All of the following are characteristic of lichens EXCEPT - D) they are a symbiotic relationship between a fungus and a protozoan. All of the following are characteristics of the Platyhelminthes EXCEPT that they - C) Have highly developed digestive and nervous system All of the following bacteria are gram-positive. Which does NOT belong with the others? - D) Listeria All of the following bacteria are motile. Which does NOT have flagella? - D) spirochetes All of the following statements are reasons why fluorescent in situ hybridization (FISH) has become a valuable tool for environmental microbiologists EXCEPT - D) it allows one to obtain pure cultures of microbes All prokaryotic organisms are currently classified in the Kingdom - C) Monera All viruses possess - E) RNA or DNA and a capsid An apoenzyme that loses its coenzyme subunit will be non-functional. (TRUE or FALSE) - TRUE An envelope is acquired during which of the following steps? - E) release An envelope is acquired during which of the following steps? - E) release An enzyme, citrate synthase, in the Krebs cycle is inhibited by ATP. This is an example of all of the following except - B) competitive inhibition An example of a latent viral infection is - B) cold sores. An example of a persistent viral infection is - E) Varicellavirus infection. An experiment began with 4 cells in a log phase and ended with a 128 cells. How many generations did the cells go though? - D) 5 An infectious protein is a - E) prion An isolated colony on a streak plate contains milli