MIC 102 Exam Questions with Correct Answers

MIC 102 Exam Questions with Correct Answers What are the three main subgroups of Eukaryotes? - Answer-Algae, Protozoa, Fungi What subgroup does Algae and Protozoa make? - Answer-Protists DESCRIBE THE ROLE OF A PLASMA MEMBRANE AND A CELL WALL. - Answer- What's the difference between Basic & Differential Stain? - Answer-Basic Stain: Allows you to determine the basic structure of a bacteria (rod, etc) Differential Stain: Uses more than one stain -- most popular: the gram stain. Why would the cell wall be an important target for antibiotics? - Answer-Because the cell wall of Prokaryotes (like bacteria) has peptidoglycan, which is not found in Eukaryotes. The structure that defines the existence of a cell is the - Answer-cell membrane Differences between Gram-Positive & Gram-Negative cells: - Answer-Positive: - during staining, it retains a dark purple stain after the decolorizer step - THICK. has 5 or more layers of peptidoglycan (which is why it stays purple. more layers.) -its peptidoglycan units - NAG & NAM are joined INdirectly via Pentaglycine bridge. Negative: - during staining, it eventually becomes colorless after the decolorizer step - has only 1-3 layers of peptidoglycan - its peptidoglycan units - NAG & NAM - are joined directly Archaea live in extreme conditions. What helps them accomplish this? - Answer-- having ether linkage (more stable instead of ester) - methylated groups - tighter bonds - monolayer instead of bilayer - stronger - inserting/fusing ring structures