BIO 104 TJ BACTERIA Virus and Bacteria worksheet.pdf - Thomas ... - Free Printable
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Step-by-step solution for: BIO 104 TJ BACTERIA Virus and Bacteria worksheet.pdf - Thomas ...
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Step-by-step solution for: BIO 104 TJ BACTERIA Virus and Bacteria worksheet.pdf - Thomas ...
The image you uploaded appears to be a worksheet titled "Viruses and Bacteria Worksheet." The task involves identifying and labeling parts of a virus and bacteria. Below is the solution with explanations for each part:
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#### Section 1: Virus
1. Label the parts of the virus shown in the diagram.
- Capsid: The protein shell that encloses the genetic material of the virus.
- Genetic Material (DNA/RNA): The nucleic acid (either DNA or RNA) that contains the virus's genetic information.
- Envelope (if present): A lipid membrane derived from the host cell, which some viruses have.
2. Fill in the blanks:
- A virus is not considered alive because it cannot reproduce on its own. It requires a host cell to replicate.
- The smallest unit of life is called a cell.
- A virus must infect a living cell to reproduce.
3. True or False:
- Viruses are made up of cells. False – Viruses are not cellular; they lack a cell structure.
- All viruses have an envelope. False – Only some viruses have an envelope; others do not.
- Viruses can survive outside a host cell indefinitely. False – Viruses cannot survive indefinitely outside a host cell; they require a host to replicate.
4. Short Answer:
- How do viruses infect cells?
Viruses infect cells by attaching to the surface of a host cell using proteins on their capsid or envelope. They then inject their genetic material into the host cell, hijacking the cell's machinery to produce more viral particles.
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#### Section 2: Bacteria
1. Label the parts of the bacterium shown in the diagram.
- Cell Wall: Provides structural support and protection.
- Plasma Membrane: Regulates the movement of substances in and out of the cell.
- Cytoplasm: The gel-like substance inside the cell where metabolic activities occur.
- Nucleoid: The region containing the bacterial DNA (not enclosed by a nuclear membrane).
- Ribosomes: Small structures where proteins are synthesized.
- Flagella: Long, whip-like structures used for movement.
- Pili: Short, hair-like structures used for attachment to surfaces or other cells.
2. Fill in the blanks:
- Bacteria are single-celled organisms.
- The main difference between prokaryotic and eukaryotic cells is that prokaryotic cells lack a nucleus.
- Bacteria reproduce through binary fission.
3. True or False:
- All bacteria are harmful to humans. False – Many bacteria are beneficial, such as those in our gut microbiome.
- Bacteria have a nucleus. False – Bacteria are prokaryotes and do not have a nucleus.
- Antibiotics can kill both bacteria and viruses. False – Antibiotics only target bacteria; they are ineffective against viruses.
4. Short Answer:
- What are some beneficial roles of bacteria in nature?
Bacteria play crucial roles in various natural processes, such as decomposing organic matter, nitrogen fixation in soil, aiding in human digestion, and producing certain vitamins and antibiotics.
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- Virus Labels: Capsid, Genetic Material, Envelope (if present)
- Bacteria Labels: Cell Wall, Plasma Membrane, Cytoplasm, Nucleoid, Ribosomes, Flagella, Pili
- Fill in the Blanks and True/False answers provided above.
- Short Answers explained in detail above.
Boxed Final Answer:
$$
\boxed{\text{See detailed solutions above.}}
$$
---
Worksheet: Viruses and Bacteria
#### Section 1: Virus
1. Label the parts of the virus shown in the diagram.
- Capsid: The protein shell that encloses the genetic material of the virus.
- Genetic Material (DNA/RNA): The nucleic acid (either DNA or RNA) that contains the virus's genetic information.
- Envelope (if present): A lipid membrane derived from the host cell, which some viruses have.
2. Fill in the blanks:
- A virus is not considered alive because it cannot reproduce on its own. It requires a host cell to replicate.
- The smallest unit of life is called a cell.
- A virus must infect a living cell to reproduce.
3. True or False:
- Viruses are made up of cells. False – Viruses are not cellular; they lack a cell structure.
- All viruses have an envelope. False – Only some viruses have an envelope; others do not.
- Viruses can survive outside a host cell indefinitely. False – Viruses cannot survive indefinitely outside a host cell; they require a host to replicate.
4. Short Answer:
- How do viruses infect cells?
Viruses infect cells by attaching to the surface of a host cell using proteins on their capsid or envelope. They then inject their genetic material into the host cell, hijacking the cell's machinery to produce more viral particles.
---
#### Section 2: Bacteria
1. Label the parts of the bacterium shown in the diagram.
- Cell Wall: Provides structural support and protection.
- Plasma Membrane: Regulates the movement of substances in and out of the cell.
- Cytoplasm: The gel-like substance inside the cell where metabolic activities occur.
- Nucleoid: The region containing the bacterial DNA (not enclosed by a nuclear membrane).
- Ribosomes: Small structures where proteins are synthesized.
- Flagella: Long, whip-like structures used for movement.
- Pili: Short, hair-like structures used for attachment to surfaces or other cells.
2. Fill in the blanks:
- Bacteria are single-celled organisms.
- The main difference between prokaryotic and eukaryotic cells is that prokaryotic cells lack a nucleus.
- Bacteria reproduce through binary fission.
3. True or False:
- All bacteria are harmful to humans. False – Many bacteria are beneficial, such as those in our gut microbiome.
- Bacteria have a nucleus. False – Bacteria are prokaryotes and do not have a nucleus.
- Antibiotics can kill both bacteria and viruses. False – Antibiotics only target bacteria; they are ineffective against viruses.
4. Short Answer:
- What are some beneficial roles of bacteria in nature?
Bacteria play crucial roles in various natural processes, such as decomposing organic matter, nitrogen fixation in soil, aiding in human digestion, and producing certain vitamins and antibiotics.
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Final Answer:
- Virus Labels: Capsid, Genetic Material, Envelope (if present)
- Bacteria Labels: Cell Wall, Plasma Membrane, Cytoplasm, Nucleoid, Ribosomes, Flagella, Pili
- Fill in the Blanks and True/False answers provided above.
- Short Answers explained in detail above.
Boxed Final Answer:
$$
\boxed{\text{See detailed solutions above.}}
$$
Parent Tip: Review the logic above to help your child master the concept of virus and bacteria worksheet answer key.
