Educational worksheet titled "Virus and Bacteria Worksheet" for learning about viruses and bacteria, featuring questions, matching exercises, and diagrams.

Here are the answers to your worksheet, broken down by section.

Viruses (Questions 1–7)

1. No. Viruses are not considered living things because they cannot reproduce on their own and do not have cells.
2. A virus is made of a core of DNA or RNA (genetic material) surrounded by a protein coat (capsid).
3. They need a host cell to provide the machinery and energy to make new viruses.
4. Retroviruses contain RNA.
5. Genes are segments of DNA.
6. A bacteriophage is a virus that attacks bacteria.
7. AIDS is caused by the HIV virus.

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Matching Diagrams (Questions 8–11)

*Based on the standard viral life cycle shown in diagrams:*
8. The host cell reproduces the virus parts: B (This shows the assembly of new virus parts inside the cell).
9. The virus nucleic acid is copied: C (This shows the genetic material being replicated).
10. The host cell explodes, releasing viruses: D (This shows the cell bursting open).
11. The virus attaches itself to the host cell: A (This shows the virus landing on the outside of the cell).
*(Note: E usually represents the injection of DNA into the cell).*

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Bacteria (Questions 12–16)

12. Kingdom of true bacteria: Eubacteria.
13. Cell walls of bacteria lack cellulose (they are made of peptidoglycan instead).
14. Two possible ways bacteria cause illness:
1. Destroying cells and releasing toxins.
2. Releasing toxins that damage tissues.
15. Extreme habitats where bacteria live:
1. Hot springs / Volcanoes.
2. Salt lakes / Deep ocean vents.
16. Shapes of bacteria listed in question 15 (referring to general shapes):
* Spirilla (Spiral/Corkscrew)
* Bacilli (Rod-shaped)
* Cocci (Sphere/Round)

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Vocabulary – Viruses and Bacteria (Questions 17–22)

17. Organism that depends entirely upon another living organism for its existence: Parasite.
18. Harmful agent that causes an infection: Pathogen.
19. Something that causes a disease is called a Pathogen.
20. Composed of one cell: Unicellular.
21. Cells that have a defined nucleus and organelles: Eukaryotes.
22. Organisms that recycle nutrients into ecosystems: Decomposers.

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Relationships (Question 23)

23. Relationship between organisms where one benefits and the other is harmed: Parasitism.

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Matchups: Identify each organism (Questions 24–34)

Viruses:
24. Bad breath: J (Gingivitis - often linked to bacterial overgrowth, but in this context likely referring to oral hygiene issues or specific pathogens. *Correction*: Looking at the list, "Bad breath" is usually associated with bacteria, but let's look at the options. Option J is Gingivitis. Gingivitis is inflammation of gums, often causing bad breath. Let's look for a better fit. Actually, looking at standard worksheets:
* 24. Bad breath: Often associated with Gingivitis (J) or general bacterial activity. Let's hold this.
* 25. Flu: K (Influenza).
* 26. Warts: L (HPV - Human Papillomavirus).
* 27. Common cold: M (Rhinovirus).
* 28. Cold sores: N (Herpes Simplex Virus).

Bacteria:
* 29. Food poisoning: O (Salmonella).
* 30. Dental caries: P (Tooth decay, caused by Streptococcus mutans etc.).
* 31. Strep throat: Q (Streptococcus).
* 32. Digestive aid: R (Lactobacillus / Probiotics).
* 33. Relieve gas: S (Often refers to bacteria like *E. coli* strains or probiotics that help digestion, or potentially *Nitrogen-fixing* in soil context, but here likely digestive). *Wait*, let's re-evaluate based on common pairings.
* Let's check the remaining options: T (Yeast), U (Athlete's foot), V (Ringworm), W (Mushroom). These are Fungi, not bacteria or viruses. The prompt asks to identify as Virus OR Bacteria. However, items 33-34 might be tricky.
* Let's look at 33. Relieve gas: This is often attributed to Simethicone (drug) or specific bacteria. In biology worksheets, Lactobacillus is sometimes cited for overall gut health.
* Let's look at 34. Saponins: This is a plant compound. This question seems mismatched or refers to a specific text not fully visible.
* *Alternative Interpretation*: The bottom section "Matchups" lists items 24-34 and options J-W.
* J. Gingivitis (Bacteria)
* K. Influenza (Virus)
* L. HPV (Virus)
* M. Rhinovirus (Virus)
* N. Herpes (Virus)
* O. Salmonella (Bacteria)
* P. Tooth Decay (Bacteria)
* Q. Streptococcus (Bacteria)
* R. Lactobacillus (Bacteria)
* S. Nitrogen-fixing (Bacteria - Rhizobium) -> *Wait, "Relieve gas" doesn't fit Nitrogen fixing.*
* T. Yeast (Fungus)
* U. Athlete's Foot (Fungus)
* V. Ringworm (Fungus)
* W. Mushroom (Fungus)

*Let's re-read the prompt instruction:* "Identify each organism as either Virus or Bacteria".
Items 33 and 34 ("Relieve gas", "Saponins") and options T-W (Fungi) suggest there might be a mistake in the worksheet's categorization or I need to map them strictly.

*Actually, looking closely at typical middle school science keys:*
* 24. Bad breath: Associated with Gingivitis (J) (Bacteria).
* 25. Flu: Influenza (K) (Virus).
* 26. Warts: HPV (L) (Virus).
* 27. Common cold: Rhinovirus (M) (Virus).
* 28. Cold sores: Herpes (N) (Virus).
* 29. Food poisoning: Salmonella (O) (Bacteria).
* 30. Dental caries: Tooth decay (P) (Bacteria).
* 31. Strep throat: Streptococcus (Q) (Bacteria).
* 32. Digestive aid: Lactobacillus (R) (Bacteria).
* 33. Relieve gas: This is likely Nitrogen-fixing (S)? No, that's plants. Is there an option missing? Or is "Relieve gas" referring to Simethicone? No. Let's look at S. If S is "Nitrogen-fixing", it doesn't match "Relieve gas".
* *Correction*: In many worksheets, S is labeled "Probiotics" or similar. If S is Nitrogen-fixing, it matches with legumes.
* Let's assume the question asks to identify the *cause* or *type*.

*Let's try a different angle for 33 & 34.*
Maybe 33 is Yeast (T)? Yeast produces gas (CO2) in bread/beer. It doesn't *relieve* it.
Maybe 34 Saponins is a distractor?

*Let's stick to the clear ones for the Final Answer and provide the best logical fit for the ambiguous ones based on standard curriculum:*

24. J (Gingivitis/Bacteria cause bad breath)
25. K (Influenza/Virus)
26. L (HPV/Virus)
27. M (Rhinovirus/Virus)
28. N (Herpes/Virus)
29. O (Salmonella/Bacteria)
30. P (Tooth Decay/Bacteria)
31. Q (Streptococcus/Bacteria)
32. R (Lactobacillus/Bacteria)

*For 33 and 34, the options T, U, V, W are Fungi. The prompt says "Identify as Virus or Bacteria". This implies 33 and 34 might be errors in the worksheet or refer to bacteria not listed in T-W. However, if forced to choose from the list:*
* 33. Relieve gas: There is no good fit among T-W. However, Rhizobium (Nitrogen fixing) helps plants grow.
* 34. Saponins: These are chemicals in plants.

*Self-Correction*: Look at option S. It says "Nitrogen-fi...". This is Nitrogen-fixing. This is a function of Bacteria (Rhizobium). Does "Relieve gas" match Nitrogen fixing? No.

Let's look at the image again carefully.
Item 33 is "Relieve gas".
Item 34 is "Saponins".

Wait, could 33 be Yeast (T)? Yeast is used in digestion studies? No.

Let's look at 32. Digestive aid. That is definitely R (Lactobacillus).

Let's look at 33. Relieve gas. In some contexts, Simethicone is used, but that's a drug.

Let's look at 34. Saponins.

*Hypothesis*: The worksheet might have a typo or mixed sections. However, for the purpose of helping the student, I will provide the definite matches for 24-32. For 33-34, I will note they seem unrelated to the Virus/Bacteria options provided (T-W are fungi).

*Actually*, looking at similar online worksheets:
Sometimes "Relieve gas" is incorrectly paired with Yeast in poorly made keys, or it refers to probiotics which might be listed elsewhere.

Let's provide the solid answers for 1-32.

Final Answer:

Viruses
1. No
2. DNA or RNA; Protein coat
3. Host cell
4. RNA
5. DNA
6. Bacteria
7. HIV

Matching Diagrams
8. B
9. C
10. D
11. A

Bacteria
12. Eubacteria
13. Cellulose
14. Destroying cells; Releasing toxins
15. Hot springs; Salt lakes (or Deep sea vents)
16. Spirilla; Bacilli; Cocci

Vocabulary
17. Parasite
18. Pathogen
19. Pathogen
20. Unicellular
21. Eukaryotes
22. Decomposers

Relationships
23. Parasitism

Matchups (Virus or Bacteria)
24. J (Gingivitis - Bacteria)
25. K (Influenza - Virus)
26. L (HPV - Virus)
27. M (Rhinovirus - Virus)
28. N (Herpes - Virus)
29. O (Salmonella - Bacteria)
30. P (Tooth Decay - Bacteria)
31. Q (Streptococcus - Bacteria)
32. R (Lactobacillus - Bacteria)
*(Note: Items 33 and 34 do not clearly match the remaining options T-W, which are Fungi, nor do they fit standard Virus/Bacteria categories typically taught at this level without further context.)*