MICB 200 Exam 1 Study Guide Solutions

MICB 200 Exam 1 Study Guide Solutions In the scientific name, "Staphylococcus aureus", "Staphylococcus" is the - ANSWERgenus In the scientific name, "Staphylococcus aureus", "aureus" is the - ANSWERspecies An acid- fast stain is a differential staining technique used to detect - ANSWERMycobacterium species Any microorganism that grows in the presence of oxygen must produce - ANSWERsuperoxide dismutase What mechanism best represents how ultraviolet (UV) rays kill bacteria and produce mutations? - ANSWERUV rays crosslink thymines in the DNA, forming dimers and preventing DNA replication and transcription Which of he following statements best describes the activity of a competitive inhibitor? - ANSWERThe competitive inhibitor binds to the active site on the enzyme preventing the binding of the normal substrate Allolactose is the - ANSWERinducer of the lac operon ©EMILLECT 2024/2025 ACADEMIC YEAR. ALL RIGHTS RESERVED FIRST PUBLISH OCTOBER 2024 Page 2/15 Why must complementary DNA (cDNA) be made of a eukaryotic gene before it is inserted into a bacterial plasmid? - ANSWERBacteria cannot remove introns in the DNA and splice together the exons Which of the following contributions and contributors are mismatched? Alexander Fleming: discovered penicillin Joseph Lister: performed the first successful vaccination Anton van Leeuwenhoek: discovered microorganisms Robert Koch: proved germ theory with his postulates Paul Ehrlich: used arsenic compounds to treat infectious disease - ANSWERJoseph Lister: performed the first successful vaccination ©EMILLECT 2024/2025 ACADEMIC YEAR. ALL RIGHTS RESERVED FIRST PUBLISH OCTOBER 2024 Page 3/15 {This is incorrect. The person who performed the first successful vaccination was Edward Jenner) Methylene blue, a blue basic stain, is applied to a bacterial smear and then rinsed off. When you look at the smear under the microscope, you see blue spherical shaped cells on a clear background. Which of the following statements best explains this phenomenon? - ANSWERBacterial cell walls have a negative charge and attract the positive charge of the chromophore of the basic stain In the Embden- Meyerhof pathway, 1 molecule of glucose is metabolized to - ANSWER2 molecules of pyruvic acid, 2ATP and 2NADH Below are 3 different culture media. Which of the medium (media) is (are) compels medium (media)? (grams=g; milliliters=ml) Medium A C6H12O6 (6.34g) KNO3 (5.45g) NaHPO4 (3.23g)