- رُكْـنُ الْجَامِعَـةِ

1. What is the primary goal of infection control in healthcare settings? A) To eliminate all germs from the environment B) To prevent or stop the spread of infections C) To increase patient antibiotic use D) To replace hand hygiene with medical equipment cleaning Answer: B) To prevent or stop the spread of infections --- 2. Which of the following best describes a "source" (reservoir) of infectious agents? A) A person who has symptoms of infection B) A place where germs live, such as human skin or surfaces C) The method by which a germ moves D) A person who is immune to infection Answer: B) A place where germs live, such as human skin or surfaces --- 3. Transmission in infection control refers to: A) The place where germs live B) A person who is susceptible to infection C) A way germs move to a susceptible person D) The body’s reaction to infection Answer: C) A way germs move to a susceptible person --- 4. Which of the following is an example of a susceptible person? A) Someone who is vaccinated and healthy B) Someone with a weakened immune system and a portal of entry for germs C) Someone who is colonized with germs but has no symptoms D) Someone who never takes antibiotics Answer: B) Someone with a weakened immune system and a portal of entry for germs --- 5. Colonization means: A) A person has an active infection with symptoms B) A person has germs on or in their body but no symptoms C) A person is immune to all germs D) A person has been vaccinated against a specific germ Answer: B) A person has germs on or in their body but no symptoms --- 6. Can colonized people transmit germs to others? A) No, only symptomatic people can transmit B) Yes, they can still transmit the germs they carry C) Only if they have a fever D) Only through airborne transmission Answer: B) Yes, they can still transmit the germs they carry --- 7. Which of the following is an example of a source in healthcare settings? A) A healthcare worker washing hands B) A dry bed rail in a patient care area C) A patient's immune response D) A vaccination record Answer: B) A dry bed rail in a patient care area --- 8. Which of the following is considered a wet surface source of germs? A) Medical equipment countertop B) Inside of pipes with biofilms C) A patient's dry skin D) A clean surgical drape Answer: B) Inside of pipes with biofilms --- 9. Indwelling medical devices (e.g., catheters, IV lines) can act as: A) Transmission pathways only B) Sources where germs live C) Immune system boosters D) Vaccination tools Answer: B) Sources where germs live --- 10. Physical contact transmission occurs when: A) A person inhales dust containing germs B) Droplets from a sneeze land on someone's eye C) A healthcare provider touches contaminated equipment then a patient before hand hygiene D) A patient receives a vaccination Answer: C) A healthcare provider touches contaminated equipment then a patient before hand hygiene --- 11. Droplet transmission happens when: A) Someone is stuck with a used needle B) An infected person coughs and droplets land on another person's mucous membranes C) Germs travel through dry air for long distances D) A person touches a contaminated surface Answer: B) An infected person coughs and droplets land on another person's mucous membranes --- 12. Inhalation as a transmission route can occur from: A) Touching a bed rail B) Construction dust containing germs C) Using alcohol-based hand sanitizer D) Cleaning a catheter Answer: B) Construction dust containing germs --- 13. Which is an example of transmission via sharps injury? A) Coughing on a patient B) Accidental needlestick with a used needle C) Drinking contaminated water D) Breathing near a sink Answer: B) Accidental needlestick with a used needle --- 14. Which underlying medical condition can increase susceptibility to infection? A) Mild seasonal allergies B) Diabetes C) Treated athlete's foot D) Well-controlled hypertension Answer: B) Diabetes --- 15. Medications that can decrease the body's ability to fight infection include: A) Antihistamines

D) Avoiding surveillance of resistance patterns Answer: C --- 18. What is the purpose of surveillance in addressing resistance? A) To increase antibiotic sales B) To monitor resistance patterns and inform treatment protocols C) To reduce public awareness D) To limit research and development Answer: B --- 19. Research and development efforts should focus on: A) Using only existing antibiotics B) Avoiding alternative therapies C) New antibiotics and alternative therapies D) Reducing investment in drug discovery Answer: C --- 20. Public awareness campaigns aim to: A) Encourage self-medication with antibiotics B) Educate the public on the responsible use of antibiotics C) Promote antibiotics for viral infections D) Discourage vaccination Answer: B --- 21. In veterinary medicine, MDR is defined as an isolate not susceptible to: A) All available agents B) At least one agent in at least three antimicrobial classes C) Exactly two antimicrobial classes D) One agent in one class Answer: B --- 22. In veterinary medicine, XDR is defined as an isolate not susceptible to at least one agent in: A) All but one or two available classes B) All available classes C) Only one class D) Three classes exactly Answer: A --- 23. In veterinary medicine, PDR is defined as an isolate not susceptible to: A) At least one agent in all classes B) All agents in all available classes C) At least three classes D) Only one class Answer: B --- 24. According to the lecture, the application of MDR/XDR/PDR definitions in veterinary medicine should be considered: A) Permanent and unchanging B) Static, with possible future changes C) Identical to human medicine without change D) Irrelevant to veterinary practice Answer: B --- 25. Why might the classification of a resistance phenotype change in veterinary medicine over time? A) Because bacteria stop evolving B) Because more veterinary-specific clinical breakpoints or antimicrobial classes/agents become available C) Because definitions are fixed globally D) Because resistance always decreases Answer: B --- 26. Which of the following is NOT a mechanism of resistance mentioned? A) Genetic mutations B) Horizontal gene transfer (e.g., plasmids) C) Efflux pumps D) Increased antibiotic production by bacteria Answer: D --- 27. PDR infections lead to: A) Low morbidity and mortality rates B) High morbidity and mortality rates C) No change in patient outcomes D) Easily treatable infections Answer: B --- 28. The lecture emphasizes that coordinated efforts are needed between: A) Only doctors and nurses B) Only public health organizations C) Healthcare providers, patients, and public health organizations D) Only researchers and pharmaceutical companies Answer: C --- 29. Which statement is true according to the conclusion? A) Understanding MDR, XDR, and PDR is unimportant B) Only new antibiotics can solve the problem C) Understanding MDR, XDR, and PDR is crucial in fighting antibiotic resistance D) Resistance is not a serious threat Answer: C

1. What is antibiotic resistance? A) When viruses become resistant to vaccines B) When bacteria evolve mechanisms to resist the effects of medications C) When the human body rejects antibiotics D) When antibiotics become more potent over time Answer: B --- 2. How is Multidrug Resistance (MDR) defined in the lecture? A) Non-susceptibility to all antimicrobial agents B) Non-susceptibility to at least one agent in one antimicrobial category C) Non-susceptibility to at least one agent in three or more antimicrobial categories D) Non-susceptibility to at least two agents in two categories Answer: C --- 3. Which of the following is an implication of MDR? A) Standard antibiotics are more effective B) Infections are easier to treat C) Standard antibiotics are ineffective D) No change in treatment protocols Answer: C --- 4. Common organisms exhibiting MDR include: A) Streptococcus pyogenes and Neisseria gonorrhoeae B) Escherichia coli and Klebsiella pneumoniae C) Mycobacterium leprae and Clostridium tetani D) Salmonella typhi and Vibrio cholerae Answer: B --- 5. Which mechanisms can lead to antibiotic resistance? A) Genetic mutations only B) Horizontal gene transfer only C) Efflux pumps only D) Genetic mutations, horizontal gene transfer, and efflux pumps Answer: D --- 6. How is Extensively Drug-Resistant (XDR) defined? A) Non-susceptibility to all agents in all antimicrobial categories B) Non-susceptibility to at least one agent in all but two or fewer antimicrobial categories C) Non-susceptibility to exactly three antimicrobial categories D) Susceptibility to all agents Answer: B --- 7. Which bacterium is mentioned as a common example of XDR? A) Escherichia coli B) Staphylococcus aureus C) Mycobacterium tuberculosis D) Clostridium difficile Answer: C --- 8. For XDR, bacterial isolates remain susceptible to how many antimicrobial categories? A) Three or more B) None C) One or two D) All categories Answer: C --- 9. The mechanisms of XDR are similar to MDR but may include: A) Fewer resistance genes B) Only efflux pumps C) More sophisticated resistance mechanisms and combinations of resistance genes D) Only genetic mutations Answer: C --- 10. What is Pandrug Resistance (PDR)? A) Non-susceptibility to at least one agent in three categories B) Non-susceptibility to all agents in all antimicrobial categories C) Susceptibility to all agents except one D) Resistance to only one antimicrobial class Answer: B --- 11. Which organisms are mentioned as examples of PDR? A) Escherichia coli and Klebsiella pneumoniae B) Mycobacterium tuberculosis and Streptococcus pneumoniae C) Acinetobacter baumannii and Pseudomonas aeruginosa D) Neisseria meningitidis and Haemophilus influenzae Answer: C --- 12. PDR often arises from: A) A single genetic mutation B) Accumulation of multiple resistance mechanisms over time C) Lack of efflux pumps D) Overuse of probiotics Answer: B --- 13. Which of the following is a public health impact of MDR, XDR, and PDR? A) Shorter hospital stays B) Decreased morbidity and mortality C) Increased morbidity and mortality D) Reduced economic burden Answer: C --- 14. Resistant infections lead to: A) Simpler treatments B) Lower death rates C) Longer hospital stays and more complex treatments D) Decreased need for intensive care Answer: C --- 15. The economic burden of antibiotic resistance includes: A) Shorter hospitalizations B) Lower costs for healthcare systems C) Longer hospitalizations, more intensive care, and need for new drugs D) Reduced need for antibiotics Answer: C --- 16. Why is antibiotic resistance a global public health risk? A) Bacteria cannot spread across geographical boundaries B) Resistance is confined to one region C) Bacteria can easily spread across populations and geographical boundaries D) Antibiotics are effective worldwide Answer: C --- 17. Which strategy is mentioned to combat antibiotic resistance? A) Increasing unnecessary antibiotic use B) Stopping all antibiotic prescriptions C) Stewardship programs to encourage appropriate prescribing

D) Ampicillin Answer: B --- 24. What is a common mechanism of fluoroquinolone resistance involving efflux? A) Ribosomal methylation B) Active efflux pumps C) Beta-lactamase production D) RNA polymerase mutation Answer: B --- 25. Which fluoroquinolone is NOT listed as an example in the lecture? A) Ciprofloxacin B) Levofloxacin C) Moxifloxacin D) Ofloxacin Answer: D --- 26. The lecture emphasizes monitoring for resistance and side effects to ensure: A) Faster bacterial growth B) Optimal treatment outcomes C) Reduced drug absorption D) Increased mutation rates Answer: B --- 27. Which of the following is NOT a side effect of rifampicin? A) Hepatotoxicity B) Orange discoloration of bodily fluids C) Uveitis D) Hypersensitivity reactions Answer: C --- 28. Rifampicin resistance leading to treatment failures is often due to: A) Efflux pump upregulation B) Mutation in RNA polymerase gene C) Drug inactivation by bacterial enzymes D) Reduced drug intake Answer: B --- 29. Fluoroquinolones treat gastroenteritis because they are effective against: A) Viruses B) Parasites C) Gram-negative and some gram-positive bacteria D) Fungi Answer: C --- 30. The primary goal of inhibiting nucleic acid synthesis in bacteria is to: A) Promote bacterial mutation B) Kill the host cells C) Combat bacterial infections by disrupting replication D) Enhance immune suppression Answer: C

1. What is the primary function of drugs that inhibit nucleic acid synthesis in bacteria? A) Inhibit protein synthesis B) Disrupt cell wall formation C) Disrupt bacterial replication processes D) Block metabolic pathways Answer: C --- 2. Which enzymes do fluoroquinolones target? A) DNA polymerase and RNA polymerase B) DNA gyrase and topoisomerase IV C) Peptidoglycan transpeptidase and beta-lactamase D) Helicase and ligase Answer: B --- 3. What effect does fluoroquinolone binding have on bacterial DNA? A) Enhances supercoiling B) Prevents supercoiling, halting DNA synthesis C) Increases DNA replication speed D) Promotes RNA elongation Answer: B --- 4. Which of the following is an example of a fluoroquinolone? A) Rifampicin B) Rifabutin C) Ciprofloxacin D) Amoxicillin Answer: C --- 5. Fluoroquinolones are effective against which types of bacteria? A) Only gram-positive bacteria B) Only gram-negative bacteria C) A wide range of gram-negative and some gram-positive bacteria D) Only anaerobic bacteria Answer: C --- 6. Which infection is NOT typically treated with fluoroquinolones? A) Urinary tract infections B) Respiratory tract infections C) Gastroenteritis D) Fungal meningitis Answer: D --- 7. How do bacteria commonly resist fluoroquinolones? A) Producing beta-lactamase B) Altering ribosome structure C) Chromosomal mutations in target enzymes or reduced permeability D) Increasing peptidoglycan synthesis Answer: C --- 8. Rifampicin inhibits bacterial RNA synthesis by binding to which enzyme? A) DNA gyrase B) DNA-dependent RNA polymerase C) Topoisomerase IV D) Reverse transcriptase Answer: B --- 9. Rifampicin is a first-line treatment for which disease? A) Meningococcal meningitis only B) Tuberculosis C) AIDS D) Urinary tract infection Answer: B --- 10. Rifampicin is also used for prophylaxis in which infection? A) Tuberculosis B) Mycoplasma pneumonia C) Meningococcal infections D) Cholera Answer: C --- 11. Resistance to rifampicin typically arises from: A) Efflux pumps only B) Mutations in the RNA polymerase gene C) Plasmid-mediated beta-lactamase D) Decreased cell wall permeability Answer: B --- 12. Which drug has a mechanism similar to rifampicin but a broader spectrum against mycobacteria? A) Ciprofloxacin B) Levofloxacin C) Rifabutin D) Moxifloxacin Answer: C --- 13. Rifabutin is particularly useful in treating: A) Tuberculosis alone B) Mycobacterium avium complex infections in AIDS patients C) Gram-negative sepsis D) Viral hepatitis Answer: B --- 14. Resistance to rifabutin emerges through mechanisms similar to: A) Fluoroquinolones B) Aminoglycosides C) Rifampicin D) Tetracyclines Answer: C --- 15. Fluoroquinolones are well-absorbed orally and excreted primarily via: A) Liver B) Lungs C) Kidneys (renal excretion) D) Bile Answer: C --- 16. Rifampicin and rifabutin are primarily excreted via: A) Kidneys B) Liver (with rifabutin showing more biliary excretion) C) Sweat glands D) Saliva Answer: B --- 17. Which side effect is commonly associated with fluoroquinolones? A) Orange discoloration of bodily fluids B) Uveitis C) Gastrointestinal discomfort and dizziness D) Hepatotoxicity only Answer: C --- 18. A potential toxicity of fluoroquinolones in young patients involves: A) Liver fibrosis B) Cartilage damage C) Kidney failure D) Peripheral neuropathy only Answer: B --- 19. Which side effect is specific to rifampicin? A) Skin rash B) Uveitis C) Orange discoloration of bodily fluids D) Cardiac arrhythmia Answer: C --- 20. Rifabutin can cause which unique side effect among the drugs listed? A) Hepatotoxicity B) Uveitis C) Dizziness D) Cartilage toxicity Answer: B --- 21. Which drug class inhibits DNA supercoiling? A) Rifamycins B) Fluoroquinolones C) Aminoglycosides D) Macrolides Answer: B --- 22. Which drug binds to DNA-dependent RNA polymerase? A) Ciprofloxacin B) Levofloxacin C) Rifampicin D) Moxifloxacin Answer: C --- 23. A patient with AIDS and Mycobacterium avium complex infection would benefit most from: A) Ciprofloxacin B) Rifabutin C) Levofloxacin

ملاحظة مهمة: هذا الشي يعني مو يعني تقرون بس هذني لا فقط تركزون عليهن ✨

A factor affecting drug choice mentioned is: A) Patient's blood group B) Patient's age C) Patient's height D) Patient's diet Answer: B) Patient's age --- 26. Prophylactic use of penicillin is indicated for: A) Tuberculosis B) Meningococcal infection C) Rheumatic fever D) HIV/AIDS Answer: C) Rheumatic fever --- 27. Isoniazid is used prophylactically for: A) Rheumatic fever B) Tuberculosis C) Meningococcal infection D) Endocarditis Answer: B) Tuberculosis --- 28. Rifampin is used prophylactically for: A) Tuberculosis B) Rheumatic fever C) Meningococcal infection D) Urinary tract infection Answer: C) Meningococcal infection --- 29. Surgical prophylaxis should ideally be: A) Long duration and broad spectrum B) Short duration and narrow spectrum C) Long duration and narrow spectrum D) Short duration and broad spectrum Answer: B) Short duration and narrow spectrum --- 30. Immunocompromised patients include: A) Athletes B) Cancer patients C) Children under 5 years D) Elderly over 80 years Answer: B) Cancer patients --- 31. An indication for combination therapy is: A) Mild infection B) To increase toxicity C) To prevent resistance D) To reduce cost Answer: C) To prevent resistance --- 32. Example of combination therapy mentioned: A) Penicillin + tetracycline B) β-lactam + aminoglycoside C) Vancomycin + rifampin D) Metronidazole + daptomycin Answer: B) β-lactam + aminoglycoside --- 33. Which antibiotic is bactericidal and acts on the 30S subunit? A) Tetracycline B) Doxycycline C) Streptomycin D) Chloramphenicol Answer: C) Streptomycin --- 34. Which of the following is a carbapenem? A) Amoxicillin B) Ceftriaxone C) Imipenem D) Aztreonam Answer: C) Imipenem --- 35. Daptomycin belongs to which class? A) Cell wall synthesis inhibitor B) Cell membrane function disruptor C) Protein synthesis inhibitor D) Nucleic acid synthesis inhibitor Answer: B) Cell membrane function disruptor --- 37. Linezolid is an example of: A) Aminoglycoside B) Tetracycline C) Oxazolidinone D) Quinolone Answer: C) Oxazolidinone --- 38. Which of the following is a lincosamide? A) Erythromycin B) Clindamycin C) Azithromycin D) Linezolid Answer: B) Clindamycin ---

1. What is the primary component of the bacterial cell wall targeted by certain antibiotics? A) Lipopolysaccharide B) Peptidoglycan C) Chitin D) Cellulose Answer: B) Peptidoglycan --- 2. Why are cell wall synthesis inhibitors selectively toxic to bacteria? A) They block bacterial DNA replication B) Human cells lack peptidoglycan C) They inhibit human ribosomes D) They disrupt human cell membranes Answer: B) Human cells lack peptidoglycan --- 3. Cell wall synthesis inhibitors act only on: A) Non-dividing bacteria B) Actively dividing bacteria C) All bacteria regardless of growth phase D) Fungal cells Answer: B) Actively dividing bacteria --- 4. Which of the following is a β-lactam antibiotic? A) Vancomycin B) Bacitracin C) Ceftriaxone D) Cycloserine Answer: C) Ceftriaxone --- 5. Which of the following is NOT a β-lactam antibiotic? A) Penicillin B) Imipenem C) Amoxicillin D) Daptomycin Answer: D) Daptomycin --- 6. Vancomycin belongs to which class of antibiotics? A) β-lactams B) Other cell wall inhibitors C) Protein synthesis inhibitors D) Nucleic acid synthesis inhibitors Answer: B) Other cell wall inhibitors --- 7. Most cell wall synthesis inhibitors are: A) Bacteriostatic and toxic B) Bactericidal and have low toxicity C) Bacteriostatic with high toxicity D) Only effective against fungi Answer: B) Bactericidal and have low toxicity --- 8. Polymyxins (e.g., colistin) act by: A) Inhibiting cell wall synthesis B) Disrupting cell membrane integrity C) Inhibiting protein synthesis D) Blocking DNA replication Answer: B) Disrupting cell membrane integrity --- 9. Why do polymyxins have higher toxicity? A) They inhibit human ribosomes B) Bacterial membranes resemble human cell membranes C) They accumulate in human bones D) They cannot be excreted by the kidneys Answer: B) Bacterial membranes resemble human cell membranes --- 10. Bacterial ribosomes are: A) 80S B) 70S C) 60S D) 90S Answer: B) 70S --- 11. Human ribosomes are: A) 70S B) 80S C) 50S D) 30S Answer: B) 80S --- 12. Aminoglycosides act on which ribosomal subunit? A) 50S B) 30S C) 60S D) 40S Answer: B) 30S --- 13. Which of the following is an aminoglycoside? A) Tetracycline B) Doxycycline C) Gentamicin D) Erythromycin Answer: C) Gentamicin --- 14. Aminoglycosides are effective against: A) Anaerobic Gram-positive bacteria only B) Aerobic Gram-negative bacteria C) Fungi D) Viruses Answer: B) Aerobic Gram-negative bacteria --- 15. Tetracyclines are primarily: A) Bactericidal B) Bacteriostatic C) Fungicidal D) Virucidal Answer: B) Bacteriostatic --- 16. Which antibiotic acts on the 50S ribosomal subunit? A) Streptomycin B) Tetracycline C) Azithromycin D) Amikacin Answer: C) Azithromycin --- 17. Chloramphenicol acts on: A) 30S ribosomal subunit B) 50S ribosomal subunit C) Cell membrane D) DNA gyrase Answer: B) 50S ribosomal subunit --- 18. Quinolones inhibit: A) RNA polymerase B) DNA gyrase C) Peptidoglycan synthesis D) Folic acid synthesis Answer: B) DNA gyrase --- 19. Rifampin inhibits: A) DNA gyrase B) RNA polymerase C) Cell membrane function D) 30S ribosomal subunit Answer: B) RNA polymerase --- 20. Metronidazole acts by: A) Inhibiting cell wall synthesis B) Damaging DNA C) Blocking protein synthesis D) Inhibiting folic acid synthesis Answer: B) Damaging DNA --- 21. Sulfonamides inhibit: A) DNA replication B) RNA transcription C) Folic acid synthesis D) Cell membrane function Answer: C) Folic acid synthesis --- 22. Trimethoprim inhibits: A) DNA gyrase B) Dihydrofolate reductase C) Peptidoglycan cross-linking D) 50S ribosomal subunit Answer: B) Dihydrofolate reductase --- 23. Sulfonamides and trimethoprim act: A) Antagonistically B) Synergistically C) Only against viruses D) Only on fungi Answer: B) Synergistically --- 24. Which is a therapeutic use of antibiotics? A) Prevention of rheumatic fever B) Given before surgery C) Treatment of urinary tract infection D) Prevention of tuberculosis with isoniazid Answer: C) Treatment of urinary tract infection --- 25.

Which step of protein synthesis is directly blocked by tetracyclines? A) Initiation B) Elongation C) Termination D) Transcription Answer: B --- 29. The lecture emphasizes prudent antibiotic use to: A) Increase sales B) Minimize resistance development C) Reduce side effects only D) Treat viral infections Answer: B ---

1. Bacterial ribosomes are composed of which subunits? A) 50S and 30S B) 60S and 40S C) 50S and 40S D) 60S and 30S Answer: A --- 2. Mammalian ribosomes are classified as: A) 70S B) 80S C) 90S D) 100S Answer: B --- 3. Which step of protein synthesis involves the addition of amino acids to the growing polypeptide chain? A) Initiation B) Elongation C) Termination D) Transcription Answer: B --- 4. Aminoglycosides bind to which ribosomal subunit? A) 50S B) 30S C) 60S D) 40S Answer: B --- 5. Which of the following is an example of an aminoglycoside? A) Tetracycline B) Chloramphenicol C) Streptomycin D) Doxycycline Answer: C --- 6. Aminoglycosides cause misreading of mRNA, leading to: A) Increased protein synthesis B) Nonfunctional proteins C) Faster bacterial growth D) Enhanced cell wall synthesis Answer: B --- 7. A major resistance mechanism against aminoglycosides is: A) Efflux pumps B) Plasmid-mediated enzymes that modify the drug C) Ribosomal protection proteins D) Target alteration Answer: B --- 8. Tetracyclines bind to which ribosomal subunit? A) 50S B) 30S C) 60S D) 40S Answer: B --- 9. What is the primary mechanism of tetracyclines? A) Block initiation complex B) Inhibit peptidyl transferase C) Prevent attachment of aminoacyl-tRNA to ribosome D) Cause mRNA misreading Answer: C --- 10. Which of the following is a tetracycline? A) Amikacin B) Gentamicin C) Minocycline D) Streptomycin Answer: C --- 11. Efflux pumps are a resistance mechanism against: A) Aminoglycosides only B) Tetracyclines C) Chloramphenicol only D) All protein synthesis inhibitors Answer: B --- 12. Chloramphenicol binds to which ribosomal subunit? A) 30S B) 50S C) 40S D) 70S Answer: B --- 13. What enzyme inactivates chloramphenicol? A) Beta-lactamase B) Aminoglycoside modifying enzyme C) Chloramphenicol acetyltransferase D) Peptidyl transferase Answer: C --- 14. Chloramphenicol inhibits which enzymatic activity? A) Peptidyl transferase B) Helicase C) DNA polymerase D) RNA polymerase Answer: A --- 15. Chloramphenicol is generally considered: A) Bactericidal B) Bacteriostatic C) Both D) Neither Answer: B --- 16. A serious toxicity of chloramphenicol in newborns is: A) Nephrotoxicity B) Ototoxicity C) Gray syndrome D) Photosensitivity Answer: C --- 17. Aminoglycosides are often combined with which class of antibiotics for synergy? A) Tetracyclines B) Beta-lactams C) Macrolides D) Sulfonamides Answer: B --- 18. Which toxicity is commonly associated with aminoglycosides? A) Hepatotoxicity B) Cardiotoxicity C) Nephrotoxicity and ototoxicity D) Photosensitivity Answer: C --- 19. Tetracyclines can cause deposition in teeth, leading to: A) Increased strength B) Discoloration C) Decay D) Erosion Answer: B --- 20. Which of the following is NOT a tetracycline? A) Doxycycline B) Minocycline C) Amikacin D) Tetracycline Answer: C --- 21. Ribosomal protection proteins provide resistance against: A) Aminoglycosides B) Tetracyclines C) Chloramphenicol D) Beta-lactams Answer: B --- 22. The initiation complex in bacteria involves: A) mRNA, ribosomal units, and tRNA B) Only mRNA and ribosomes C) Only tRNA and ribosomes D) DNA and RNA polymerase Answer: A --- 23. Chloramphenicol is reserved for serious infections due to: A) High cost B) Side effects and potential toxicity C) Narrow spectrum D) Rapid resistance development Answer: B --- 24. Which drug class can cause aplastic anemia as a serious side effect? A) Aminoglycosides B) Tetracyclines C) Chloramphenicol D) Beta-lactams Answer: C --- 25. Aminoglycosides are particularly effective against: A) Gram-positive anaerobes B) Gram-negative aerobes C) Fungi D) Viruses Answer: B --- 26. Due to resistance, tetracyclines should not be used as: A) Second-line therapy B) First-line therapy for certain infections C) Topical agents D) Combination therapy Answer: B --- 27. Photosensitivity is a known side effect of: A) Aminoglycosides B) Tetracyclines C) Chloramphenicol D) Penicillins Answer: B --- 28.