BIO 111 Week 5 Review: Eukaryotic Cell Structure and Function

Q1. Identify and name the function of the following organelles:

• a. nucleus

• b. nuclear envelope

• c. nucleolus

• d. ribosome

• e. endoplasmic reticulum (smooth ER and rough ER)

• f. vesicle

• g. Golgi apparatus

• h. lysosome

• i. vacuole

• j. mitochondria

• k. chloroplast

• l. peroxisome

• m. cytoskeleton

Background

Topic: Eukaryotic Cell Structure

This question tests your ability to recognize major organelles in eukaryotic cells and describe their primary functions.

Key Terms:

• Organelle: Specialized structure within a cell that performs a specific function.

• Function: The main role or job of the organelle in the cell.

Step-by-Step Guidance

1. Review the structure of each organelle listed. For example, the nucleus is typically the largest organelle and contains the cell's genetic material.

2. Recall the main function of each organelle. For instance, the mitochondria are often called the "powerhouse" of the cell because they generate ATP.

3. For each organelle, write a brief description of its structure and its primary function in the cell.

4. Consider how these organelles interact with each other to maintain cellular function.

Try solving on your own before revealing the answer!

Q2. Distinguish between the following pairs of terms:

• a. magnification and resolution

• b. prokaryotic and eukaryotic cell

• c. free and bound ribosomes

Background

Topic: Cell Biology Terminology

This question asks you to compare and contrast important terms related to microscopy and cell structure.

Key Terms:

• Magnification: How much larger an image appears compared to its actual size.

• Resolution: The clarity or detail of an image; the ability to distinguish two points as separate.

• Prokaryotic cell: Cell lacking a nucleus and membrane-bound organelles (e.g., bacteria).

• Eukaryotic cell: Cell with a nucleus and membrane-bound organelles (e.g., plants, animals).

• Free ribosomes: Ribosomes floating in the cytosol.

• Bound ribosomes: Ribosomes attached to the endoplasmic reticulum.

Step-by-Step Guidance

1. Define each term in the pair separately.

2. Identify the main difference between the two terms in each pair.

3. Provide an example or context where each term is used.

Try solving on your own before revealing the answer!

Q3. Describe the structure and function of the components (organelles) of the endomembrane system.

Background

Topic: Endomembrane System

This question focuses on the interconnected system of membranes within eukaryotic cells that work together to modify, package, and transport lipids and proteins.

Key Terms:

• Endomembrane system: Includes the nuclear envelope, endoplasmic reticulum, Golgi apparatus, lysosomes, vesicles, and plasma membrane.

Step-by-Step Guidance

1. List the main organelles that are part of the endomembrane system.

2. For each organelle, describe its structure (e.g., flattened sacs, network of membranes).

3. Explain the function of each organelle in the context of the endomembrane system (e.g., protein synthesis, modification, transport).

4. Describe how materials move between these organelles (e.g., via vesicles).

Try solving on your own before revealing the answer!

Q4. Compare the structure and functions of microtubules, microfilaments, and intermediate filaments.

Background

Topic: Cytoskeleton

This question tests your understanding of the three main types of cytoskeletal fibers in eukaryotic cells.

Key Terms:

• Microtubules: Hollow tubes made of tubulin proteins.

• Microfilaments: Thin strands made of actin proteins.

• Intermediate filaments: Fibrous proteins coiled into cables.

Step-by-Step Guidance

1. Describe the structure of each type of cytoskeletal element.

2. List the main functions of each (e.g., cell shape, movement, anchoring organelles).

3. Compare and contrast their roles and properties.

Try solving on your own before revealing the answer!

Q5. Explain how the ultrastructure of cilia and flagella relate to their functions.

Background

Topic: Cell Motility Structures

This question asks you to connect the detailed structure of cilia and flagella to how they move cells or substances.

Key Terms:

• Cilia: Short, hair-like projections.

• Flagella: Longer, whip-like structures.

• Ultrastructure: The detailed structure visible with an electron microscope, such as the "9+2" arrangement of microtubules.

Step-by-Step Guidance

1. Describe the internal structure of cilia and flagella (e.g., arrangement of microtubules).

2. Explain how this structure enables movement.

3. Relate differences in structure to differences in function between cilia and flagella.

Try solving on your own before revealing the answer!

Q6. Describe the structure of a plant cell wall.

Background

Topic: Plant Cell Structure

This question focuses on the composition and organization of the plant cell wall.

Key Terms:

• Cell wall: Rigid outer layer found in plant cells, mainly composed of cellulose.

• Primary wall, secondary wall, middle lamella: Different layers of the cell wall.

Step-by-Step Guidance

1. Identify the main components of the plant cell wall.

2. Describe the structure and function of each layer (primary wall, secondary wall, middle lamella).

3. Explain how the cell wall contributes to plant cell function and structure.

Try solving on your own before revealing the answer!

Q7. Describe the structure and roles of the extracellular matrix in animal cells.

Background

Topic: Animal Cell Structure

This question asks you to explain what the extracellular matrix (ECM) is and its importance in animal cells.

Key Terms:

• Extracellular matrix (ECM): Network of proteins and carbohydrates outside animal cells.

• Collagen, proteoglycans, fibronectin: Major components of the ECM.

Step-by-Step Guidance

1. List the main components of the ECM.

2. Describe the structure of the ECM and how it is organized.

3. Explain the roles of the ECM in animal cells (e.g., support, signaling, adhesion).

Try solving on your own before revealing the answer!

Q8. Describe four different intercellular junctions.

Background

Topic: Cell Junctions

This question tests your knowledge of how animal and plant cells connect and communicate with each other.

Key Terms:

• Tight junctions: Seal cells together to prevent leakage.

• Desmosomes: Anchor cells together.

• Gap junctions: Allow communication between animal cells.

• Plasmodesmata: Channels between plant cells.

Step-by-Step Guidance

1. Name each type of intercellular junction.

2. Describe the structure of each junction.

3. Explain the function of each junction in the context of tissue structure and communication.

Try solving on your own before revealing the answer!