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Ch. 15 - Antimicrobial Drugs
Norman-McKay- Microbiology: Basic and Clinical Principles 2nd Edition
Norman-McKay2nd EditionMicrobiology: Basic and Clinical PrinciplesISBN: 9780137661619Not the one you use?Change textbook
All textbooksNorman-McKay 2nd EditionCh. 15 - Antimicrobial DrugsProblem 8
Chapter 15, Problem 8

The difference between a synthetic drug and a semisynthetic drug is that
a. the semisynthetic drug is a modified synthetic drug.
b. the synthetic drug is a modified natural drug.
c. the synthetic drug is a modified semisynthetic drug.
d. the semisynthetic drug is a modified natural drug.

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1
Step 1: Understand the definitions of synthetic and semisynthetic drugs. A synthetic drug is one that is completely created through chemical synthesis in the laboratory, without direct use of natural products as the starting material.
Step 2: Recognize that a semisynthetic drug is derived from a natural product but chemically modified to enhance its properties, such as increasing efficacy, reducing toxicity, or improving stability.
Step 3: Compare the two types: synthetic drugs are fully man-made, while semisynthetic drugs start from a natural compound and are then chemically altered.
Step 4: Analyze the answer choices in light of these definitions to identify which correctly describes the relationship between synthetic and semisynthetic drugs.
Step 5: Conclude that the semisynthetic drug is a modified natural drug, meaning it originates from a natural compound that has been chemically modified.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Synthetic Drugs

Synthetic drugs are chemical compounds created entirely in the laboratory without direct use of natural substances. They are designed to mimic or improve upon natural drugs, often offering greater purity and consistency.
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Semisynthetic Drugs

Semisynthetic drugs are derived by chemically modifying natural substances, such as antibiotics produced by microorganisms. This modification enhances their effectiveness, stability, or spectrum of activity compared to the original natural compound.
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Difference Between Synthetic and Semisynthetic Drugs

The key difference is that synthetic drugs are fully man-made, while semisynthetic drugs start as natural compounds that are chemically altered. Understanding this distinction helps in classifying drugs based on their origin and method of production.
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Related Practice
Textbook Question

Which of the following antimicrobial properties would be the most crucial to consider in developing a new antimicrobial?

a. Selective toxicity

b. Ease of administration

c. Lack of drug interactions

d. Long half-life

e. The drug’s capacity to be bactericidal

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Textbook Question

Assume a bacterium makes beta-lactamase. Could you still use a glycopeptide drug to treat an infection caused by this bacterium? Explain your reasoning.

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Textbook Question

Which drug family would be the most effective to treat a patient diagnosed with a MRSA infection?

a. Penicillins

b. Third-generation cephalosporins

c. Carbapenems

d. Lincosamides

e. Aminoglycosides

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Textbook Question

Choose the true statement(s) about therapeutic index (TI). Select all that apply.

a. A drug with a high therapeutic index would be effective above the dose at which it is potentially toxic.

b. A narrow TI is preferable.

c. A drug for which the maximum safe dose is close to the minimum effective dose would have a high TI.

d. It is one measure of a drug’s general safety.

e. A drug that is not selectively toxic would most likely have a high TI.

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Textbook Question

What advantages might a semisynthetic antimicrobial drug have over an antibiotic?

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Textbook Question

Assume a clinical sample yields a strain of S. aureus containing a plasmid that encodes two antimicrobial-resistance genes. How did the bacterium most likely acquire these new resistance genes?

a. The strain was intrinsically resistant.

b. The strain obtained the genes through horizontal gene transfer.

c. The strain acquired the genes by a random mutation.

d. The strain picked up the genes by an efflux pump.

e. The strain acquired the genes through cell division events.

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