Straighterline Microbiology BIO 250 Unit 1-25 FINAL Exam Questions and answers Latest 2024/2025 Graded A+ | 100% Correct.

Straighterline Microbiology BIO 250 Unit 1-25 FINAL Exam Questions and answers Latest 2024/2025 Graded A+ | 100% Correct. The sum total of all the microbes in a certain environment is termed the______ Select one: a. biofilm b. microbial niche c. microbiome d. phylogeny e. domain: Microbiome 2. Studies of the immune response to an infection caused by microorganisms would be performed by a/an _______. Select one: a. hypersensitivity specialist b. geomicrobiologist c. epidemiologist d. immunologist: Immunologist 3. Which of the following is NOT a recent discovery that has had a huge impact on the understanding of microbiology? Select one: a. Human microbiome project b. PCR technique c. Small RNAs d. Restriction enzymes e. All are significant discoveries.: All are significant discoveries 4. A scientist studying the sequence of nucleotides in the rRNA of a bacterial species is working on _______. Select one: a. determining if that species is the cause of a new disease b. determining evolutionary relatedness c. nomenclature 3 / 45 d. recombinant DNA e. bioremediation: Determining evolutionary relatedness 5. Which of the following historical microbiologists is incorrectly paired with his contribution to the science? Select one: a. Francesco Redi: tested spontaneous generation with meat exposed to the air or covered with cloth b. Louis Pasteur: demonstrated that anthrax was caused by a bacterium c. Joseph Lister: promoted disinfecting hands and air prior to surgery d. Antonie van Leeuwenhoek:made and used quality magnifying lenses to observe and record microorganisms: Louis pasteur: Demonstrated the anthrax was caused by a bacterium 6. Which of the following is a taxon that contains all the other taxa listed? Select one: a. Phylum b. Genus c. Kingdom d. Family e. Species: Kingdom 7. Which of the following are not considered microorganisms? Select one: a. Mosquitoes b. Fungi c. Bacteria d. Viruses e. Protozoa: Mosquitoes 8. The microorganisms that recycle nutrients by breaking down dead matter and wastes are called ______. Select one: a. prokaryotes b. decomposers 4 / 45 c. pathogens d. fermenters e. eukaryotes: b. Decomposers 9. Which of the following is a unique characteristic of viruses that distinguishes them from the other major groups of microorganisms? Select one: a. Cannot be seen without a microscope b. Cause human disease c. Lack a nucleus d. Lack cell structure e. Contain genetic material: Lack of Cell structure 10. All cells contain _______. Select one: a. mitochondria to generate ATP b. organelles for compartmentalization c. ribosomes for protein synthesis d. cell walls made of cellulose e. uracil in their DNA: c. ribosomes for protein synthesis 11. Compared to a solution of pH 9, a solution of pH 7 _______. Select one: a. has a higher pH b. has no OH - ions c. is more basic d. has more H + ions: d. has more H + ions 12. Burning coal produces sulfur dioxide in the atmosphere. When combined with rain that falls into bodies of water, this leads to _______. Select one: a. a greater concentration of OH- ions in the water b. a decrease in the pH level of the water c. no change in the pH level of the water 5 / 45 d. an increase in pH level of the water: b. a decrease in the pH level of the water 13. Most biochemical macromolecules are polymers, which are chains of ______. Select one: a. hydrogen bonds b. repeating carbohydrates c. hydrophobic molecules d. repeating monomers e. electrolytic molecules: d. repeating monomers 14. Which type of microscope cannot image live specimens? Select one: a. Bright-field b. Phase-contrast c. Differential interference d. Electron e. Dark-field: d. Electron 15. A scanningconfocalmicroscope _______. Select one: a. uses ultraviolet light to form a specimen image b. uses dyes that emit visible light when excited by ultraviolet radiation c. scans narrow planes and can build a three-dimensional image of the spec-imen d. produces specimen images on electron micrographs: c. scans narrow planes and can build a three-dimensional image of the specimen 16. The term that refers to the purposeful addition of microorganisms into a laboratory nutrient medium is ______. Select one: a. inoculation b. immunization c. isolation 6 / 45 d. contamination e. infection: a. inoculation 17. The Five I's of studying microorganisms include all of the following except ______. Select one: a. isolation b. incubation c. inoculation d. infection e. identification: d. infection 18. All bacterial cells have ______. Select one: a. capsules b. the ability to produce endospores c. flagella d. an S-layer e. a chromosome: e. a chromosome 19. A bacterial cell exhibiting chemotaxis must have ______. Select one: a. fimbriae b. a capsule c. thylakoids d. metachromatic granules e. flagella: e. flagella 20. Gram-negative bacteria _______. Select one: a. have a more complex cell envelope with a greater variation in chemical composition b. are generally more susceptible to antibiotics than gram-positive bacteriac. include all pathogens d. appear purple following the Gram stain: a. have a more complex cell envelope with a greater variation in chemical composition 7 / 45 21. The chemical components of ribosomes are proteins and ______. Select one: a. rRNA b. tRNA c. mRNA d. DNA: a. rRNA 22. During unfavorable growth conditions, many protozoa can convert to a resistant, dormant stage called a/an ______. Select one: a. trophozoite b. cyst c. endospore d. seed e. sporozoa: b. cyst 23. The long, thread-like branching cells of molds are called ______. Select one: a. septa b. hyphae c. asci d. conidiophores e. pseudohyphae: b. hyphae 24. Which of the following is not a characteristic of a transformed cell? Select one: a. Viral nucleic acid integrated into host DNA b. Capacity to divide indefinitely