GTC BIO 2117 Test 4 Review UPDATED Exam Questions and CORRECT Answers
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Course
GTC BIO 2117
Institution
GTC BIO 2117
GTC BIO 2117 Test 4 Review UPDATED
Exam Questions and CORRECT Answers
What do we call antibiotics that kill gram negative and gram positive bacteria? - Correct
Answer- Broad spectrum drugs (antibiotics) are effective against both gram negative and
gram positive bacteria.
What do we call it ...
GTC BIO 2117 Test 4 Review UPDATED
Exam Questions and CORRECT Answers
What do we call antibiotics that kill gram negative and gram positive bacteria? - Correct
Answer- Broad spectrum drugs (antibiotics) are effective against both gram negative and
gram positive bacteria.
What do we call it when we give the patient 2 or 3 different antibiotics a once? Why would
we do that? - Correct Answer- Combination chemotherapy. Pathogens are capable of
becoming resistant to a single agent, but combination chemotherapy (using more than one
drug) makes it more difficult for the pathogen to develop resistance.
What is chemotherapeutic index? - Correct Answer- The relationship between toxicity of a
compound for the body and the toxicity for parasites.
If a drug has a low chemotherapeutic index, what does that mean? Is that good or bad? -
Correct Answer- Drugs that have a low chemotherapeutic index often inhibit pathways or
attack structures found in the host cells. For example, cancer cells closely resemble normal
body cells, therefore, it is difficult to poison the cancer cells without poisoning the body. A
low chemotherapeutic is bad. The larger the therapeutic index, the better the
chemotherapeutic agent, and the less toxic it is to the host. Drugs often have high therapeutic
indexes if the target of the drug is a structure or pathway not found in the host organism.
A drug has a low selective toxicity. Is that a good or bad thing? - Correct Answer- Selective
toxicity is the ability of a chemical or drug to kill a microorganism without harming its host,
therefore, a low selective toxicity is a bad thing.
Name four major methods by which antibiotics work: - Correct Answer- 1) inhibit cell wall
synthesis
2) inhibit protein synthesis
3) inhibitor of nucleic acid synthesis
4) inhibit folic acid synthesis
Penicillin is made by a ______? - Correct Answer- fungus (mold/penicillium)
How does penicillin harm bacteria? - Correct Answer- Penicillin is in a group of "beta-
lactam" drugs that work by inhibiting the cross-linkages between the NAM-NAG layers of
the peptidoglycan cell wall. Results in faulty cell wall and lysis of bacteria: bacteriocidal.
What are three problems with penicillin? - Correct Answer- 1) overuse has led to resistance.
Many bacteria have beta-lactamase (penicillinase), an enzyme which inactivates the
penicillin.
2) narrow spectrum
3) anaphylactic reaction: many people allergic
What types of microorganisms are affected by pencillin? - Correct Answer- primarily for
staph and strep infections- also syphilis
What do we mean by semisynthetic penicillin? Are they only good for gram positive
microorganisms? - Correct Answer- Altered natural beta-lactams create semisynthetic
derivatives of penicillin. These are synthetic and more expensive. They have a broader
spectrum than penicillin due to their modified chemical structures.
Why do they add clavulinic acid to penicillin? - Correct Answer- The clavulinic acid
inactivates the penicillinase made by bacteria.
What is beta-lactamase? - Correct Answer- A bacterial enzyme that catalyzes the hydrolysis
of the lactam ring in some penicillin antibiotics, rendering them ineffective. Beta-lactamase is
also known as penicillinase.
Cephalosporins are described as first generation, second generation, and third generation.
What is the difference? - Correct Answer- first generation are generally used for gram
positives. They are narrow spectrum. second generation are more broad. They kill enterics
(gram - and some gram +). Third generation kills pseudomonas and is broad spectrum killing
gram - and even more gram +.
How do these work? - Correct Answer- They work like penicillin by inhibiting cell wall
synthesis. They do this by inhibiting the cross linkages between the NAM and NAG layers of
the peptidoglycan cell wall. The cephalosporins are resistant to beta lactamase enzyme.
, Why are these drugs better for some people than penicillin? - Correct Answer- They are
active against more organisms and do not cause as many allergic reactions as penicillin.
Name four drugs other than penicillin that inhibit the synthesis of the cell wall: - Correct
Answer- ABI V.
1. Augmentin
2. Bacitracin
3. Vancomycin
4. Isoniazid
Which of these drugs is used to treat MRSA? - Correct Answer- vancomycin
Which of these drugs is for topical application? - Correct Answer- bacitracin
Name 2 drugs that inhibit mycolic acid production/cell wall synthesis in Mycobacteria: -
Correct Answer- isoniazid and ethambutol
Why can we give drugs that disrupt ribosomes? Wouldn't that also affect human ribosomes? -
Correct Answer- The drugs only affect the 30s ribosomes in prokaryotic cells. Human cells
are not affected because they have 40s ribosomes since they are eukaryotic.
Aminoglycosides are effective against gram _____ bacteria - Correct Answer- negative
What are some side effects of aminoglycosides? - Correct Answer- 1. hearing loss
2. kidney damage
Tetracycline is considered a ______________ _____________ antibiotic. - Correct Answer-
broad spectrum
Tetracycline is effective against intracellular bacteria such as: - Correct Answer- chlamydia
and rickettsia
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