Name ID MULTIPLE CHOICE. Choose the one alternative that best completes the stat
ID: 277744 • Letter: N
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Name ID MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1)hhich is sensitive to penicillin treatment? A) Mycoplasma B) Thermoplasma. C) protoplast D) Staphylococcus aureus E) spheroplast. 2) Benicillin A) inhibits the formation of NAG-NAM precursor of peptidoglycan synthesis. B) inhibits the activity of transglycosylases in peptidoglycan synthesis. C) stimulates the activity of transpeptidase in peptidoglycan synthesis. D) inhibits the formation of peptide cross-bridges in E) does none of the above. doglycan. 3) Acid-fast stain must be used to stainMycobacterium and Norcadia because they have A) teichoic acids. B) periplasm C) hydrophobic outer membrane. D) thick peptidoglycan layer. E) mycolic acid. opeptidoglycan is a characteristic of the walls of A) Eukarya. B) some Bacteria and Archaea. C) Bacteria and Archaea D) Bacteria. E) some Archaea. 5)then you treat E. coli (a Gram-negative) with lysozyme, you will probably produce A) spheroplast B) peptidoplast C) protoplast D) Thermoplasma E) Mycoplasma 6) Which is NOT true about bacterial cytoplasmic membrane? A) Because it has hydrophilic part, hydrophilic and charged molecules can easily pass through the membranes. B) It is a bilayer of phospholipids. C) Its fluidity can be controlled by changing the length of fatty acids. D) It contains many different kinds of proteins. E) All of the above are true.Explanation / Answer
1.b) Thermoplasma because all others are resistance against penicillin.
2.D) •?-Lactams inhibit Transpeptidase leading to
• Damage of cross-linking
• A weakening of cell wall
• Swelling of the cell due to Endosmosis
• Bacterial membrane bursts
• Bacterial lysis
3. E) mycolic acid: Acid-fast bacteria such as Mycobacterium consist of a large number of lipid substances within their cells called mycolic acids.
4. E) Pseudopeptidoglycan is a characteristic feature of some Archea which differs from that of bacterial peptidoglycan.
5.A) Spheroplast: ItTheyhave their cell wall only partially removed and are gram ? (gram-negative).
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