Educational worksheet on bacteria and viruses with interactive learning activities.
Bacteria and Viruses Worksheet featuring multiple educational sections including a diagram of bacterial cell anatomy, multiple-choice questions, and a crossword puzzle on viruses, bacteria, protists, and fungi.
PNG
1134×896
412.7 KB
Free · Personal Use
Quality Assured by Worksheets Library Team
Reviewed for educational accuracy and age-appropriateness
ID: #694798
⭐
Show Answer Key & Explanations
Step-by-step solution for: Bacteria and Viruses - Worksheet | Printable and Distance Learning ...
▼
Show Answer Key & Explanations
Step-by-step solution for: Bacteria and Viruses - Worksheet | Printable and Distance Learning ...
Absolutely! Let’s solve this “Bacteria and Viruses Worksheet” step by step, explaining each answer clearly.
---
## Q.1: True or False
1. Bacterial cells are much smaller than plant or animal cells.
✔ True — Bacteria are prokaryotes and typically 0.2–10 micrometers in size, while eukaryotic plant/animal cells are usually 10–100 micrometers.
2. Bacterial cells are microscopic eukaryotic cells.
✘ False — Bacteria are prokaryotic, not eukaryotic. They lack a nucleus and membrane-bound organelles.
3. Bacteria have a variety of shapes and features.
✔ True — Common shapes: cocci (spherical), bacilli (rod-shaped), spirilla (spiral). Some have flagella, pili, capsules, etc.
4. Aerobic bacteria do not need oxygen to live.
✘ False — *Aerobic* bacteria require oxygen to live. Anaerobic bacteria do not need oxygen.
5. Viruses require living host cells to reproduce.
✔ True — Viruses are obligate intracellular parasites; they cannot replicate without a host cell.
6. Viruses are smaller than bacteria.
✔ True — Most viruses are 20–300 nanometers, while bacteria are 0.2–10 micrometers (1000 nm = 1 µm).
7. Antibiotics can kill viruses.
✘ False — Antibiotics target bacterial structures (like cell walls or ribosomes). Viruses lack these, so antibiotics don’t work on them.
---
## Q.2: Label the main parts of a typical bacterial cell
From the diagram (left side):
- Top left (long whip-like structure): Flagellum — for movement.
- Top right (hair-like projections): Pili — for attachment and conjugation.
- Outermost layer: Cell wall — provides shape and protection.
- Just inside cell wall: Plasma membrane — controls what enters/exits.
- Inside cytoplasm: Nucleoid (DNA) — circular DNA region (not enclosed).
- Small dots in cytoplasm: Ribosomes — make proteins.
- Circular structure near nucleoid: Plasmid — small extra DNA circle.
- Outer slimy layer (if present): Capsule — protects against immune system.
*(Note: The diagram may vary slightly, but standard labels are as above.)*
---
## Q.3: Which disease is NOT caused by viruses?
Options:
a) Ringworm → ✘ Fungal infection
b) AIDS → ✔ Viral (HIV)
c) Hepatitis B → ✔ Viral
d) Influenza → ✔ Viral
✔ Answer: a) Ringworm — it’s caused by fungi, not viruses.
---
## Q.4: Which disease is NOT caused by bacteria?
Options:
a) Tetanus → ✔ Bacterial (Clostridium tetani)
b) Cholera → ✔ Bacterial (Vibrio cholerae)
c) Ebola → ✘ Viral (Ebola virus)
d) Tuberculosis → ✔ Bacterial (Mycobacterium tuberculosis)
✔ Answer: c) Ebola — it’s a viral hemorrhagic fever.
---
## Q.5: Which is NOT found in bacteria?
Options:
a) Mitochondria → ✘ Not found — bacteria are prokaryotes, no membrane-bound organelles.
b) Cytoplasm → ✔ Found
c) Ribosome → ✔ Found (70S type)
d) Cell wall → ✔ Found (mostly)
✔ Answer: a) Mitochondria — only eukaryotes have mitochondria.
---
## Q.6: Which term is defined as viruses that infect bacteria?
Options:
a) Endospore → bacterial dormant form
b) Bacteriophage → ✔ correct — “phage” means eater; infects bacteria
c) Capsid → protein coat of virus
d) Antibiotic → kills bacteria
✔ Answer: b) Bacteriophage
---
## Q.7: Bacteria reproduce asexually by...
Options:
a) Budding → some yeasts/fungi
b) Fragmentation → some multicellular organisms
c) Parthenogenesis → animals (unfertilized egg)
d) Binary fission → ✔ correct — one cell splits into two identical cells
✔ Answer: d) Binary fission
---
## Q.8: Which is not a bacterial shape?
Options:
a) Rod → bacillus
b) Spiral → spirillum
c) Sphere → coccus
d) [Image shows a virus] → ✔ This is a bacteriophage (virus), not a bacterial shape!
✔ Answer: d) — the image shows a virus, not a bacterial morphology.
---
## Q.9: Microorganisms that cause disease are known as...
Options:
a) assemblies → no
b) endospores → dormant stage
c) pathogens → ✔ correct — disease-causing microbes
d) antibiotics → drugs that kill bacteria
✔ Answer: c) pathogens
---
## Q.10: Which statement about bacteria is incorrect?
Options:
a) Bacterial cells require living host cells to reproduce. → ✘ FALSE — only viruses need hosts; bacteria reproduce independently via binary fission.
b) Some bacteria fix nitrogen. → ✔ True (e.g., Rhizobium)
c) Bacteria can be found almost everywhere. → ✔ True
d) All bacteria are prokaryotes. → ✔ True
✔ Answer: a) — This is the incorrect statement.
---
## Q.11: Which microorganism makes its own food from sunlight and carbon dioxide?
Options:
a) Pathogenic bacteria → mostly heterotrophs
b) Viruses → can’t make food at all
c) Bacteriophage → virus, no metabolism
d) Cyanobacteria → ✔ correct — photosynthetic prokaryotes (blue-green algae)
✔ Answer: d) Cyanobacteria
---
## Q.12: Label the diagram of bacteriophage
From the diagram (right side):
- Head/Capsid Head → contains genetic material (DNA/RNA)
- Capsid → protein shell surrounding genetic material
- Tail Sheath → contracts to inject DNA
- Baseplate → attaches to bacterial cell
- Tail Fiber → recognizes and binds to host
- Nucleic acid (DNA) → genetic material injected into host
- Collar → connects head to tail
*(Label positions depend on diagram, but standard parts are as above.)*
---
## Crossword Puzzle: Viruses, Bacteria, Protists, and Fungi
7. Protist — eukaryotic, not animal/plant/fungus
9. Bacteria — single-celled prokaryotes with cell walls of peptidoglycan
11. Viruses — infect bacteria (also called bacteriophages)
12. Microbes — common name for disease-causing microorganisms
13. Antibiotics — fight bacterial infection
14. Algae — photosynthetic, often blue-green (cyanobacteria are prokaryotes, but "algae" is commonly used for protists like diatoms)
15. Euglena — unicellular flagellated protist with chloroplasts
1. Capsid — protective protein coat around virus genetic material
2. Bacteria — single-celled prokaryotes (same as 9 across)
3. Conjugation — process where bacteria transfer genetic material via pilus
4. Fungi — symbiotic relationship between algae/fungi (lichen)
5. Viruses — non-living agents that reproduce inside living host cells
6. Binary fission — asexual reproduction splitting into two identical daughter cells
8. Prions — “Proteinaceous infectious particles” — misfolded proteins causing disease (e.g., mad cow)
*(Note: Some clues may overlap or have multiple interpretations, but these are standard answers.)*
---
## ✔ Final Answers Summary:
1. T
2. F
3. T
4. F
5. T
6. T
7. F
- Flagellum
- Pili
- Cell wall
- Plasma membrane
- Nucleoid (DNA)
- Ribosomes
- Plasmid
- Capsule
- Tail Sheath
- Baseplate
- Tail Fiber
- Capsid Head
- Collar
- Nucleic acid (DNA)
- Capsid
Across:
7. Protist
9. Bacteria
11. Viruses
12. Microbes
13. Antibiotics
14. Algae
15. Euglena
Down:
1. Capsid
2. Bacteria
3. Conjugation
4. Fungi
5. Viruses
6. Binary fission
8. Prions
---
Let me know if you’d like this formatted as a printable answer key or need diagrams labeled visually! 🧫🧬
---
## Q.1: True or False
1. Bacterial cells are much smaller than plant or animal cells.
✔ True — Bacteria are prokaryotes and typically 0.2–10 micrometers in size, while eukaryotic plant/animal cells are usually 10–100 micrometers.
2. Bacterial cells are microscopic eukaryotic cells.
✘ False — Bacteria are prokaryotic, not eukaryotic. They lack a nucleus and membrane-bound organelles.
3. Bacteria have a variety of shapes and features.
✔ True — Common shapes: cocci (spherical), bacilli (rod-shaped), spirilla (spiral). Some have flagella, pili, capsules, etc.
4. Aerobic bacteria do not need oxygen to live.
✘ False — *Aerobic* bacteria require oxygen to live. Anaerobic bacteria do not need oxygen.
5. Viruses require living host cells to reproduce.
✔ True — Viruses are obligate intracellular parasites; they cannot replicate without a host cell.
6. Viruses are smaller than bacteria.
✔ True — Most viruses are 20–300 nanometers, while bacteria are 0.2–10 micrometers (1000 nm = 1 µm).
7. Antibiotics can kill viruses.
✘ False — Antibiotics target bacterial structures (like cell walls or ribosomes). Viruses lack these, so antibiotics don’t work on them.
---
## Q.2: Label the main parts of a typical bacterial cell
From the diagram (left side):
- Top left (long whip-like structure): Flagellum — for movement.
- Top right (hair-like projections): Pili — for attachment and conjugation.
- Outermost layer: Cell wall — provides shape and protection.
- Just inside cell wall: Plasma membrane — controls what enters/exits.
- Inside cytoplasm: Nucleoid (DNA) — circular DNA region (not enclosed).
- Small dots in cytoplasm: Ribosomes — make proteins.
- Circular structure near nucleoid: Plasmid — small extra DNA circle.
- Outer slimy layer (if present): Capsule — protects against immune system.
*(Note: The diagram may vary slightly, but standard labels are as above.)*
---
## Q.3: Which disease is NOT caused by viruses?
Options:
a) Ringworm → ✘ Fungal infection
b) AIDS → ✔ Viral (HIV)
c) Hepatitis B → ✔ Viral
d) Influenza → ✔ Viral
✔ Answer: a) Ringworm — it’s caused by fungi, not viruses.
---
## Q.4: Which disease is NOT caused by bacteria?
Options:
a) Tetanus → ✔ Bacterial (Clostridium tetani)
b) Cholera → ✔ Bacterial (Vibrio cholerae)
c) Ebola → ✘ Viral (Ebola virus)
d) Tuberculosis → ✔ Bacterial (Mycobacterium tuberculosis)
✔ Answer: c) Ebola — it’s a viral hemorrhagic fever.
---
## Q.5: Which is NOT found in bacteria?
Options:
a) Mitochondria → ✘ Not found — bacteria are prokaryotes, no membrane-bound organelles.
b) Cytoplasm → ✔ Found
c) Ribosome → ✔ Found (70S type)
d) Cell wall → ✔ Found (mostly)
✔ Answer: a) Mitochondria — only eukaryotes have mitochondria.
---
## Q.6: Which term is defined as viruses that infect bacteria?
Options:
a) Endospore → bacterial dormant form
b) Bacteriophage → ✔ correct — “phage” means eater; infects bacteria
c) Capsid → protein coat of virus
d) Antibiotic → kills bacteria
✔ Answer: b) Bacteriophage
---
## Q.7: Bacteria reproduce asexually by...
Options:
a) Budding → some yeasts/fungi
b) Fragmentation → some multicellular organisms
c) Parthenogenesis → animals (unfertilized egg)
d) Binary fission → ✔ correct — one cell splits into two identical cells
✔ Answer: d) Binary fission
---
## Q.8: Which is not a bacterial shape?
Options:
a) Rod → bacillus
b) Spiral → spirillum
c) Sphere → coccus
d) [Image shows a virus] → ✔ This is a bacteriophage (virus), not a bacterial shape!
✔ Answer: d) — the image shows a virus, not a bacterial morphology.
---
## Q.9: Microorganisms that cause disease are known as...
Options:
a) assemblies → no
b) endospores → dormant stage
c) pathogens → ✔ correct — disease-causing microbes
d) antibiotics → drugs that kill bacteria
✔ Answer: c) pathogens
---
## Q.10: Which statement about bacteria is incorrect?
Options:
a) Bacterial cells require living host cells to reproduce. → ✘ FALSE — only viruses need hosts; bacteria reproduce independently via binary fission.
b) Some bacteria fix nitrogen. → ✔ True (e.g., Rhizobium)
c) Bacteria can be found almost everywhere. → ✔ True
d) All bacteria are prokaryotes. → ✔ True
✔ Answer: a) — This is the incorrect statement.
---
## Q.11: Which microorganism makes its own food from sunlight and carbon dioxide?
Options:
a) Pathogenic bacteria → mostly heterotrophs
b) Viruses → can’t make food at all
c) Bacteriophage → virus, no metabolism
d) Cyanobacteria → ✔ correct — photosynthetic prokaryotes (blue-green algae)
✔ Answer: d) Cyanobacteria
---
## Q.12: Label the diagram of bacteriophage
From the diagram (right side):
- Head/Capsid Head → contains genetic material (DNA/RNA)
- Capsid → protein shell surrounding genetic material
- Tail Sheath → contracts to inject DNA
- Baseplate → attaches to bacterial cell
- Tail Fiber → recognizes and binds to host
- Nucleic acid (DNA) → genetic material injected into host
- Collar → connects head to tail
*(Label positions depend on diagram, but standard parts are as above.)*
---
## Crossword Puzzle: Viruses, Bacteria, Protists, and Fungi
Across:
7. Protist — eukaryotic, not animal/plant/fungus
9. Bacteria — single-celled prokaryotes with cell walls of peptidoglycan
11. Viruses — infect bacteria (also called bacteriophages)
12. Microbes — common name for disease-causing microorganisms
13. Antibiotics — fight bacterial infection
14. Algae — photosynthetic, often blue-green (cyanobacteria are prokaryotes, but "algae" is commonly used for protists like diatoms)
15. Euglena — unicellular flagellated protist with chloroplasts
Down:
1. Capsid — protective protein coat around virus genetic material
2. Bacteria — single-celled prokaryotes (same as 9 across)
3. Conjugation — process where bacteria transfer genetic material via pilus
4. Fungi — symbiotic relationship between algae/fungi (lichen)
5. Viruses — non-living agents that reproduce inside living host cells
6. Binary fission — asexual reproduction splitting into two identical daughter cells
8. Prions — “Proteinaceous infectious particles” — misfolded proteins causing disease (e.g., mad cow)
*(Note: Some clues may overlap or have multiple interpretations, but these are standard answers.)*
---
## ✔ Final Answers Summary:
Q.1: T/F
1. T
2. F
3. T
4. F
5. T
6. T
7. F
Q.2: Labels (from top to bottom/left to right in diagram)
- Flagellum
- Pili
- Cell wall
- Plasma membrane
- Nucleoid (DNA)
- Ribosomes
- Plasmid
- Capsule
Q.3: a) Ringworm
Q.4: c) Ebola
Q.5: a) Mitochondria
Q.6: b) Bacteriophage
Q.7: d) Binary fission
Q.8: d) (virus image)
Q.9: c) pathogens
Q.10: a) (bacteria don’t need host cells)
Q.11: d) Cyanobacteria
Q.12: Labels
- Tail Sheath
- Baseplate
- Tail Fiber
- Capsid Head
- Collar
- Nucleic acid (DNA)
- Capsid
Crossword:
Across:
7. Protist
9. Bacteria
11. Viruses
12. Microbes
13. Antibiotics
14. Algae
15. Euglena
Down:
1. Capsid
2. Bacteria
3. Conjugation
4. Fungi
5. Viruses
6. Binary fission
8. Prions
---
Let me know if you’d like this formatted as a printable answer key or need diagrams labeled visually! 🧫🧬
Parent Tip: Review the logic above to help your child master the concept of bacteria worksheet.
