MCB 3020 QUESTIONS AND ANSWERS

MCB 3020 Exam 1 A chemical bond formed by two atoms when they share pairs of electrons to fill their outer shells is a/an : A. Ionic bond B. Covalent bond C. Hydrophilic interaction D. Hydrogen bond E. Organic bond - Answer- B. Covalent bond Which of the following would a bacterium NOT have? A. Mitochondria B. Ribosome C. DNA D. Cell membrane - Answer- A. Mitochondria Which of the following structures adds flexibility and fluidity to prokaryotic cell membranes? A. hopanoids B. cholesterol C. glycocalyx D. integral proteins E. flagella - Answer- A. hopanoids Endospores are extremely resistant because they have: A. all of the answers are correct B. DNA repair enzymes C. DNA binding proteins D. Dehydrated core E. a sport coat - Answer- Antiport is a method of transportation during which one substance is transported against its concentration gradient. True False - Answer- False Scanning electron microscopy magnifies cells structure by 100,000's time. This makes it the best tools for observing the surface of bacteria True False - Answer- True Identify the FALSE statement A. Gram staining procedure is a type of differential staining procedure B. Gram staining procedure is the most important staining procedure in microbiology C. Gram staining procedures can differentiate cells with thick peptidoglycan from the cells with thin peptidoglycan layer D. In Gram staining procedure Gram+ cells are blue (purple) an