Virus and Bacteria Lesson Plans & Worksheets Reviewed by Teachers - Free Printable

The image provided is a worksheet asking you to identify and describe the functions of different parts of a bacterium. Below is the solution with explanations for each part:

Anatomy of a Bacterium

Here is the labeled diagram and the corresponding descriptions of each part:

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#### 1. Flagella
- Function: The flagella are long, whip-like structures used for movement. They help bacteria propel themselves through liquids by rotating like propellers.

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#### 2. Capsule (or Slime Layer)
- Function: The capsule is a protective layer that surrounds the cell wall. It helps protect the bacterium from drying out, shields it from phagocytosis (being engulfed by immune cells), and can also aid in adherence to surfaces.

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#### 3. Cell Wall
- Function: The cell wall provides structural support and protection to the bacterium. It maintains the shape of the cell and prevents it from bursting due to osmotic pressure.

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#### 4. Cytoplasm
- Function: The cytoplasm is the gel-like substance inside the cell membrane where most cellular activities occur. It contains enzymes, nutrients, and other molecules necessary for the bacterium's survival.

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#### 5. Ribosomes
- Function: Ribosomes are small structures where protein synthesis occurs. They read the genetic information from mRNA and assemble amino acids into proteins.

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#### 6. Nucleoid
- Function: The nucleoid is the region within the bacterium where the bacterial DNA is located. Unlike eukaryotic cells, bacteria do not have a membrane-bound nucleus. The nucleoid contains the bacterial chromosome, which carries the genetic information needed for the bacterium's growth, reproduction, and function.

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#### 7. Pili (or Fimbriae)
- Function: Pili are short, hair-like structures on the surface of the bacterium. They are used for attachment to surfaces or other cells, such as during conjugation (the transfer of genetic material between bacteria).

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Final Answer:

1. Flagella: Movement
2. Capsule (or Slime Layer): Protection and adherence
3. Cell Wall: Structural support and protection
4. Cytoplasm: Site of cellular activities
5. Ribosomes: Protein synthesis
6. Nucleoid: Contains bacterial DNA
7. Pili (or Fimbriae): Attachment and conjugation

Boxed Final Answer:
\[
\boxed{
\begin{array}{ll}
1. & \text{Flagella: Movement} \\
2. & \text{Capsule (or Slime Layer): Protection and adherence} \\
3. & \text{Cell Wall: Structural support and protection} \\
4. & \text{Cytoplasm: Site of cellular activities} \\
5. & \text{Ribosomes: Protein synthesis} \\
6. & \text{Nucleoid: Contains bacterial DNA} \\
7. & \text{Pili (or Fimbriae): Attachment and conjugation} \\
\end{array}
}
\]