Year 9 Science · Unit 1 · Lesson 11

Antibiotics and Antivirals

Foundation Worksheet

Name

Date

Class

Learning Goals

Match key antibiotic and antiviral terms to their correct definitions.
Explain why antibiotics cannot be used to treat viral infections.
Classify statements about treatments into the correct drug category.

Warm Up

Match each term to its definition

Draw a line connecting each term on the left to its correct definition on the right. Or write the matching letter next to each term.

Term	Your answer	Definition
Antibiotic		A. A drug that slows or stops viral replication, reducing symptom severity.
Antiviral		B. An antibiotic that kills bacteria directly, rather than just slowing them down.
Bactericidal		C. A substance that kills bacteria or stops them from multiplying.
Bacteriostatic		D. An antibiotic that works against a wide range of different bacteria.
Broad-spectrum		E. A drug that targets specific types of bacteria only.
Narrow-spectrum		F. An antibiotic that stops bacteria from multiplying without killing them outright.

Your Turn

Sort it!

Write each item from the pool into the correct category box. Some items may belong in more than one box, write them in both.

Targets cell walls of bacteria Used to treat influenza (Tamiflu) Works by selective toxicity Cannot kill viruses Reduces duration of symptoms Penicillin is an example Viruses use host cell machinery to replicate Oseltamivir (Tamiflu) is an example Antibiotic resistance can develop Must not be shared or used for wrong infection

Antibiotic

Antiviral

Neither / Both

Show What You Know

1. Penicillin kills bacteria by interfering with cell wall synthesis. Explain why this mechanism does NOT harm human cells.

Recall 2 marks

2. A friend tells you they are taking antibiotics for their cold. Explain to them why this is not helpful, and what they should do instead.

Recall 2 marks

Wrap Up

In one sentence, what was the main idea of this lesson?