Prokaryote and Eukaryote Cell Structure, Microbial Diversity, and Infectious Disease Study Guide

Q1. What is the main component found in the cell walls of fungi?

Background

Topic: Eukaryotic Microorganisms – Fungi

This question tests your knowledge of the unique structural features of fungal cells, specifically the composition of their cell walls.

Key Terms and Concepts:

• Fungi: Eukaryotic organisms with cell walls.

• Cell wall: A rigid layer outside the cell membrane, providing structural support.

• Chitin: A polysaccharide commonly found in fungal cell walls.

Step-by-Step Guidance

1. Recall the main structural difference between fungal and plant cell walls.

2. Consider the types of polysaccharides that can be found in cell walls (e.g., cellulose, chitin, peptidoglycan).

3. Identify which of these is unique to fungi and not found in plants or bacteria.

Try solving on your own before revealing the answer!

Q2. What is the dormant stage of protozoa called?

Background

Topic: Protozoan Life Cycles

This question is about the survival strategies of protozoa, specifically the form they take to withstand harsh conditions.

Key Terms and Concepts:

• Protozoa: Single-celled eukaryotic organisms.

• Dormant stage: A form that allows survival in unfavorable environments.

• Cyst: A protective, dormant form of some protozoa.

Step-by-Step Guidance

1. Think about why protozoa need a dormant stage (e.g., to survive outside a host).

2. Recall the terminology for the active (feeding) stage and the dormant (resting) stage.

3. Identify the term used for the dormant, resistant form.

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Q3. What is the size of the ribosome found in eukaryotic cells?

Background

Topic: Cell Structure – Ribosomes

This question tests your understanding of the differences between prokaryotic and eukaryotic ribosomes.

Key Terms and Concepts:

• Ribosome: Organelle responsible for protein synthesis.

• Svedberg unit (S): A measure of sedimentation rate during centrifugation, indicating ribosome size.

• 80S ribosome: Typical of eukaryotic cells.

Step-by-Step Guidance

1. Recall the two main types of ribosomes (prokaryotic vs. eukaryotic) and their Svedberg values.

2. Identify which S value is associated with eukaryotic ribosomes.

3. Compare this to the prokaryotic ribosome size for context.

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Q4. What appendage is found in spirochetes that allows for movement?

Background

Topic: Prokaryotic Cell Structure – Motility

This question focuses on the unique structures that enable spirochetes to move.

Key Terms and Concepts:

• Spirochetes: Spiral-shaped bacteria.

• Appendage: A structure that extends from the cell body, often for movement.

• Axial filament: A structure unique to spirochetes.

Step-by-Step Guidance

1. Recall the general types of appendages bacteria use for movement (e.g., flagella, pili).

2. Consider what is unique about spirochete motility compared to other bacteria.

3. Identify the name of the internal flagella-like structure in spirochetes.

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Q5. What is the structure that anchors the bacterial flagellum to the cell wall and membrane?

Background

Topic: Prokaryotic Cell Structure – Flagella

This question tests your knowledge of the parts of a bacterial flagellum and how it is attached to the cell.

Key Terms and Concepts:

• Flagellum: A whip-like structure for movement.

• Basal body: The anchoring structure of the flagellum.

Step-by-Step Guidance

1. Recall the three main parts of a bacterial flagellum: filament, hook, and basal body.

2. Identify which part is embedded in the cell envelope and serves as the anchor.

3. Consider the function of this structure in flagellar rotation and stability.

Try solving on your own before revealing the answer!

Q6. What is the term for the presence of flagella all over the surface of a bacterial cell?

Background

Topic: Bacterial Motility – Flagellar Arrangements

This question is about the terminology used to describe different flagellar arrangements on bacterial cells.

Key Terms and Concepts:

• Flagella: Structures for movement.

• Peritrichous: Flagella distributed over the entire cell surface.

Step-by-Step Guidance

1. Recall the different flagellar arrangements: monotrichous, lophotrichous, amphitrichous, peritrichous.

2. Match the arrangement to the description of flagella covering the whole cell.

3. Identify the correct term for this arrangement.

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Q7. What is a tetrad in terms of bacterial cell shape?

Background

Topic: Bacterial Morphology – Cellular Arrangements

This question tests your understanding of how bacterial cells can be arranged after division.

Key Terms and Concepts:

• Tetrad: A group of four cells arranged in a square.

• Coccus: Spherical bacterial cell.

Step-by-Step Guidance

1. Recall the different arrangements of cocci: pairs (diplococci), chains (streptococci), clusters (staphylococci), and tetrads.

2. Visualize or draw what a tetrad looks like.

3. Identify the number and arrangement of cells in a tetrad.

Try solving on your own before revealing the answer!