PHAR-6126-01 Medical Microbiology Chicago State University School of Pharmacy
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Free PHAR-6126-01 Medical Microbiology Chicago State University School of Pharmacy Questions
Exposure to a microbe can lead to:
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Disease
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Permanent colonization
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Transient colonization
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All of the above
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None of the above
Explanation
Correct Answer: D) All of the above
Exposure to a microbe does not always result in disease. Depending on factors such as the host's immune status, the virulence of the organism, the inoculum size, and the route of exposure, the outcome can vary widely. The microbe may cause disease, establish permanent colonization (becoming part of the normal flora), or result only in transient colonization where the organism is temporarily present but eventually cleared without causing infection.
This spectrum of outcomes is a foundational concept in microbiology and infectious disease, making D the most complete and correct answer.
A 21-year-old college student in Southern Florida presents to the Student Health Center seeking advice about contraception. She has never had a pelvic exam, has had 2 sex partners in the past 6 months, and does not use condoms or other contraceptives. Her periods have been regular, but she has recently noted some spotting between periods. Her last menstrual period was 4 weeks ago. She denies vaginal discharge, dyspareunia, genital lesions, or sores. The cervix appears inflamed, bleeds easily, with a purulent discharge coming from the cervical os. Which of the following bacteria may be responsible for this disease?
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N. gonorrhea
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Treponema pallidum
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M. hominis
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Chlamydia trachomatis
Explanation
Correct Answers: A) N. gonorrhea and D) Chlamydia trachomatis
The clinical picture — cervical inflammation, friable cervix (bleeds easily), purulent cervical discharge, and intermenstrual spotting in a sexually active young woman — is classic for mucopurulent cervicitis. Both Neisseria gonorrhoeae and Chlamydia trachomatis are the most common causative organisms of this condition and frequently co-infect the same patient, which is why dual treatment is standard practice.
Treponema pallidum causes syphilis, which typically presents with a painless chancre, not purulent cervicitis. Mycoplasma hominis is associated with bacterial vaginosis and pelvic inflammatory disease but is not a primary cause of the classic mucopurulent cervicitis picture described here.
Which of the following statements about penicillin-binding proteins (PBP) is FALSE?
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Target beta-lactam antibiotics
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Reside on the outer surface of the cytoplasmic membrane
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They are regulatory enzymes
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Belong to serine proteases family
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Reside in periplasmic space
Explanation
Correct Answer: C) They are regulatory enzymes
PBPs are not regulatory enzymes — this statement is false. PBPs are transpeptidases and carboxypeptidases involved in the synthesis and crosslinking of peptidoglycan in the bacterial cell wall. Their function is structural/biosynthetic, not regulatory.
All other statements are true: beta-lactam antibiotics target and irreversibly inhibit PBPs; PBPs are located on the outer surface of the cytoplasmic membrane and in the periplasmic space of gram-negative bacteria; and they belong to the serine protease superfamily because they use an active-site serine residue in their catalytic mechanism.
Which of the following bacteria causes disease by penetrating and replicating in cells lining the colon?
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Shigella
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Klebsiella
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Salmonella
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Yersinia
Explanation
Correct Answer: A) Shigella
Shigella is the classic example of an enteroinvasive pathogen that causes disease specifically by invading and replicating within the epithelial cells lining the colon. It penetrates the colonic mucosa, escapes the phagosome, replicates in the cytoplasm, and spreads cell-to-cell using actin-based motility, triggering intense inflammation and causing bloody dysentery.
Klebsiella does not invade colonic epithelium and primarily causes pneumonia and urinary tract infections. Salmonella invades small intestinal epithelium (not the colon specifically) and is transported to deeper tissues. Yersinia invades Peyer's patches in the terminal ileum, not the colon.
What toxin is produced by S. dysenteriae to disrupt protein synthesis causing endothelial damage?
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Enterotoxins
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TNF-alpha
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Exotoxin
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Endotoxin
Explanation
Correct Answer: C) Exotoxin
Shigella dysenteriae produces Shiga toxin, which is a potent exotoxin. It works by irreversibly inactivating the 60S ribosomal subunit, halting protein synthesis in host cells and causing endothelial damage. This leads to microangiopathic changes and is the mechanism underlying hemolytic uremic syndrome (HUS), a serious complication of S. dysenteriae infection.
Enterotoxins act on the gut to cause secretory diarrhea but do not disrupt protein synthesis causing endothelial damage. TNF-alpha is a host cytokine, not a bacterial toxin. Endotoxin (LPS) is a structural component of gram-negative bacterial outer membranes that triggers systemic inflammation but does not specifically disrupt protein synthesis.
Select the INCORRECT statement about mycobacterial cell wall:
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Lipids, glycolipids, and peptide-glycolipids are present
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Transport protein and porins constitute 15% of the weight
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There is no outer membrane
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Basic structure is typical of gram-negative bacteria
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Lipid components comprise 60% of the weight
Explanation
Correct Answer: D) Basic structure is typical of gram-negative bacteria
This statement is incorrect. The mycobacterial cell wall is unique and does not follow a typical gram-negative pattern. While mycobacteria do not stain well with the Gram stain and have a complex outer layer, their cell wall architecture — built around a peptidoglycan core covalently linked to arabinogalactan and an outer layer of mycolic acids — is distinctly different from gram-negative bacteria and constitutes its own structural category.
The other statements are correct: the mycobacterial cell wall is rich in lipids, glycolipids, and peptide-glycolipids; transport proteins and porins do constitute a smaller fraction of wall weight; there is no classical outer membrane like in gram-negatives; and the extraordinarily high lipid content (approximately 60% of cell wall weight), primarily mycolic acids, accounts for mycobacteria's acid-fastness, impermeability, and resistance to many antibiotics.
An ideal bioterrorism agent:
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Treatable by current medicine
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Spread through food
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Not easy to diagnose and treat
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Causes illness immediately
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Easy to detect
Explanation
Correct Answer: C) Not easy to diagnose and treat
An ideal bioterrorism agent from the perspective of a perpetrator would be one that is difficult to diagnose and treat, maximizing harm and delaying medical response. Other ideal characteristics include being highly lethal, easily disseminated, capable of causing public panic, and resistant to available treatments.
Being treatable by current medicine and easy to detect are the opposite of what makes an agent ideal for bioterrorism — these features would minimize its impact. Spreading through food limits dissemination compared to aerosolized agents. Causing illness immediately could actually alert authorities faster, whereas agents with longer incubation periods allow wider spread before detection.
Helicobacter pylori DOES NOT cause:
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Inflammatory bowel disease (IBD)
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Acute gastritis
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Peptic ulcers
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Chronic gastritis
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Gastric cancer
Explanation
Correct Answer: A) Inflammatory bowel disease (IBD)
IBD — which includes Crohn's disease and ulcerative colitis — is an autoimmune/inflammatory condition of the intestines that is NOT caused by H. pylori. Its etiology involves genetic predisposition, immune dysregulation, and gut microbiome imbalance, but not H. pylori infection.
H. pylori is a well-established cause of acute gastritis, chronic gastritis, peptic ulcer disease, and gastric adenocarcinoma. It is classified as a Group 1 carcinogen by the WHO due to its direct link to gastric cancer development through chronic inflammation and mucosal damage.
Cell wall of bacteria contains:
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Proteins
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Lipids
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Peptidoglycans
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All of the above
Explanation
Correct Answer: D) All of the above
The bacterial cell wall is a complex, multi-component structure. Peptidoglycan is the primary structural scaffold and is present in both gram-positive and gram-negative bacteria. Proteins are embedded throughout — including porins, PBPs, and surface adhesins. Lipids are present particularly in gram-negative bacteria as part of the outer membrane (lipopolysaccharide contains lipid A) and in mycobacteria as mycolic acids in their unique cell walls.
All three components are genuine constituents of bacterial cell walls, making D the most complete and correct answer.
Clostridium _____ toxin prevents release of _____ leading to flaccid paralysis.
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Botulinum, ACh
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Botulinum, GABA
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Tetanus, ACh
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Tetanus, GABA
Explanation
Correct Answer: A) Botulinum, ACh
Clostridium botulinum produces botulinum toxin, which irreversibly blocks the release of acetylcholine (ACh) at the neuromuscular junction. Without ACh, motor neurons cannot stimulate muscle contraction, resulting in flaccid paralysis — muscles are limp and unable to contract.
This is in direct contrast to tetanus toxin (C. tetani), which blocks the release of inhibitory neurotransmitters GABA and glycine in the spinal cord, leading to spastic paralysis (rigid, uncontrolled muscle contractions). The flaccid vs. spastic distinction is the key differentiator between these two clostridial toxins.
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