BIO 250 EXAM 1 (GRADED A) Questions and Answers/ 100% VERIFIED/ Straighterline.

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Question 1 Correct 4.50 points out of 4.50 Flag question Question text Humans can see objects as small as 0.1 mm. Leeuwenhoek's best microscope could magnify objects to 300X. Whi... ch of the following would be invisible using Leeuwenhoek's microscope? Select one: a. Poliovirus, 30 nm b. Red blood cell, 8 μm c. Pandora virus, 0.5 mm X 1 mm d. Escherichia coli, 1 μm X 4 μm Feedback The correct answer is: Poliovirus, 30 nm Question 2 Incorrect 0.00 points out of 4.50 Flag question Question text Which of the following statements is incorrect regarding protein structure? Select one: a. The interaction between various R groups of amino acids determines the primary structure of a protein. b. Beta-pleated sheets are a type of protein secondary structure. c. The folding of a protein to form its active site creates its tertiary structure. d. Proteins, such as antibodies that are comprised of multiple polypeptide chains, have quaternary structure. Feedback The correct answer is: The interaction between various R groups of amino acids determines the primary structure of a protein. Question 3 Correct 4.50 points out of 4.50 Flag question Question text Which of the following does not indicate microbe involvement in energy and nutrient flow? Select one: a. Thermal hot springs warmed by heat from earth's interior b. Formation of greenhouse gases, CO2 and methane c. Digestion of complex carbohydrates in animal diets d. Decomposition of dead matter and wastes Feedback The correct answer is: Thermal hot springs warmed by heat from earth's interior Question 4 Correct 4.50 points out of 4.50 Flag question Question text What is the maximum number of electrons in the first energy shell of an atom? Select one: a. 2 b. 4 c. 8 d. 18 e. 32 Feedback The correct answer is: 2 Question 5 Correct 4.50 points out of 4.50 Flag question Question text Microorganisms are best defined as organisms that Select one: a. cause human disease. b. lack a cell nucleus. c. are infectious particles. d. are too small to be seen with the unaided eye. e. can only be found growing in laboratories. Feedback The correct answer is: are too small to be seen with the unaided eye. Question 6 Correct 4.50 points out of 4.50 Flag question Question text Which of the following pairs of career descriptions and work tasks is not correctly matched? Select one: a. Industrial microbiologist -- manipulate bacterial strains to be less pathogenic b. Agricultural microbiologist -- identify bacterial causes of crop disease c. Public health microbiologist -- track the incidence of AIDS in a population d. Medical microbiologist -- identify the cause of a bladder infection at a hospital lab Feedback The correct answer is: Industrial microbiologist -- manipulate bacterial strains to be less pathogenic Question 7 Correct 4.50 points out of 4.50 Flag question Question text Taxonomy does not involve . Select one: a. nomenclature b. classification c. identification d. a common name Feedback The correct answer is: a common name Question 8 Correct 4.50 points out of 4.50 Flag question Question text A capillary tube is used to acquire a small blood sample for CBC (complete blood count) analysis. Suction is not required to transfer the blood from the fingertip prick to the tube in part due to Select one: a. ionic bonding between the water molecules. b. cohesive forces between the glass particles of the tube and the water molecules. c. covalent bonding between the water molecules. d. adhesive forces between the water molecules and the glass particles of the tube. Feedback The correct answer is: adhesive forces between the water molecules and the glass particles of the tube. Question 9 Correct 4.50 points out of 4.50 Flag question Question text The correct microbiological term for the sample of specimen that is put into a nutrient medium to produce a culture is . Select one: a. colony b. inoculum c. streak d. loop Feedback The correct answer is: inoculum Question 10 Incorrect 0.00 points out of 4.50 Flag question Question text One technique for staining bacteria for viewing under the microscope is called the Gram stain. In this technique, alcohol is used as a decolorizer because it degrades the outer membrane found in some bacteria. What chemical component of the cell does alcohol affect? Select one: a. Protein b. Carbohydrate c. Lipid d. Nucleic acids Feedback The correct answer is: Lipid Question 11 Correct 4.50 points out of 4.50 Flag question Question text Which of the following is a correct description of a component of the ATP molecule? Select one: a. Sugar: deoxyribose b. Nitrogenous base: alanine c. High energy bond: peptide bond d. Sugar: ribose e. High energy bond: glycosidic bond Feedback The correct answer is: Sugar: ribose Question 12 Correct 4.50 points out of 4.50 Flag question Question text A diagram of the three domains (Bacteria, Archaea, Eukarya) proceeding from the Last Universal Common Ancestor would show Archaea Select one: a. as the original cells from which the others derived. b. branching off the Domain Eukarya. c. branching off the Domain Bacteria. Feedback The correct answer is: branching off the Domain Eukarya. Question 13 Correct 4.50 points out of 4.50 Flag question Question text Trees of life that illustrate the phylogenetic relationships of all organisms were traditionally based on ; newer methods for determining phylogeny rely on . Select one: a. morphology; nucleic acid sequences b. nucleic acid sequences; morphology c. morphology; virology d. morphology; nutritional requirements e. nucleic acid sequences; microbiomes Feedback The correct answer is: morphology; nucleic acid sequences Question 14 Correct 4.50 points out of 4.50 Flag question Question text The wavelength of light used and the numerical aperture governs . Select one: a. illumination b. resolution c. magnification d. size of the field e. contrast Feedback The correct answer is: resolution Question 15 Correct 4.50 points out of 4.50 Flag question Question text Bacteria that require special growth factors and complex nutrients are termed . Select one: a. aerobic b. anaerobic c. fastidious d. fermentative e. hemolytic Feedback The correct answer is: fastidious Question 16 Correct 4.50 points out of 4.50 Flag question Question text Astrobiology is considered a sub-discipline of microbiology because Select one: a. life elsewhere in the universe is likely to be microbial. b. microbes are known to exist on other planets. c. all extraterrestrials known are microbial. d. only microbes can reproduce under the extreme conditions in outer space. Feedback The correct answer is: life elsewhere in the universe is likely to be microbial. Question 17 Correct 4.50 points out of 4.50 Flag question Question text All of the following pertain to the atom Carbon-14 except it Select one: a. has 6 protons. b. has 6 electrons. c. has 14 neutrons. d. is an isotope of carbon. Feedback The correct answer is: has 14 neutrons. Question 18 Correct 4.50 points out of 4.50 Flag question Question text Characteristics shared by all cells include Select one: a. a membrane serving as a cell boundary. b. the possession of genetic information. c. the presence of cellular fluid. d. All of the choices are correct. Feedback The correct answer is: All of the choices are correct. Question 19 Correct 4.50 points out of 4.50 Flag question Question text Which of the following is essential for the development of discrete, isolated colonies? Select one: a. Broth medium b. Differential medium c. Selective medium d. Solid medium e. Assay medium Feedback The correct answer is: Solid medium Question 20 Correct 4.50 points out of 4.50 Flag question Question text A pure culture contains Select one: a. only one identified species of microorganism. b. only bacteria. c. microbes from a single source. d. a variety of species from the same genus. Feedback The correct answer is: only one identified species of microorganism. [Show More]

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