Podcast
Questions and Answers
What is the nuclear membrane/envelope?
What is the nuclear membrane/envelope?
What is a nucleolus?
What is a nucleolus?
What is the nucleus?
What is the nucleus?
What is the function of the cell wall?
What is the function of the cell wall?
Signup and view all the answers
Why doesn't onion have chloroplasts?
Why doesn't onion have chloroplasts?
Signup and view all the answers
What did iodine do to the onion cells?
What did iodine do to the onion cells?
Signup and view all the answers
What is in the center of each cell?
What is in the center of each cell?
Signup and view all the answers
What is/are visible inside the nucleus?
What is/are visible inside the nucleus?
Signup and view all the answers
What surrounds each cell?
What surrounds each cell?
Signup and view all the answers
What is found just inside the cell wall?
What is found just inside the cell wall?
Signup and view all the answers
What are the colored structures found in the Elodea?
What are the colored structures found in the Elodea?
Signup and view all the answers
How many chloroplasts are typically in a cell?
How many chloroplasts are typically in a cell?
Signup and view all the answers
When focused up and down on layers of Elodea, what was detected?
When focused up and down on layers of Elodea, what was detected?
Signup and view all the answers
Which cells of Elodea are bigger?
Which cells of Elodea are bigger?
Signup and view all the answers
What is cyclosis?
What is cyclosis?
Signup and view all the answers
What does the vacuole hold?
What does the vacuole hold?
Signup and view all the answers
What is the shape of eggplant cells?
What is the shape of eggplant cells?
Signup and view all the answers
What is the name of the pigment in eggplant cells?
What is the name of the pigment in eggplant cells?
Signup and view all the answers
What structure is the pigment found in?
What structure is the pigment found in?
Signup and view all the answers
What are the channels in the thick layer surrounding the cell and their function?
What are the channels in the thick layer surrounding the cell and their function?
Signup and view all the answers
What structure is found in the 'notch' in the colored area?
What structure is found in the 'notch' in the colored area?
Signup and view all the answers
What is the shape of potato pulp cells?
What is the shape of potato pulp cells?
Signup and view all the answers
What are the oval-ish structures in each cell?
What are the oval-ish structures in each cell?
Signup and view all the answers
What do amyloplasts contain?
What do amyloplasts contain?
Signup and view all the answers
When iodine is dropped on the pulp cells, what happens?
When iodine is dropped on the pulp cells, what happens?
Signup and view all the answers
What cell part do stone cells mostly consist of?
What cell part do stone cells mostly consist of?
Signup and view all the answers
What substance makes up this specific cell structure in stone cells?
What substance makes up this specific cell structure in stone cells?
Signup and view all the answers
What are the channels through the cell wall in stone cells?
What are the channels through the cell wall in stone cells?
Signup and view all the answers
Are stone cells living or dead? Why?
Are stone cells living or dead? Why?
Signup and view all the answers
What purpose do stone cells have?
What purpose do stone cells have?
Signup and view all the answers
What is the nuclear envelope structure/function?
What is the nuclear envelope structure/function?
Signup and view all the answers
What is a nucleolus?
What is a nucleolus?
Signup and view all the answers
What is the stroma?
What is the stroma?
Signup and view all the answers
Study Notes
Cell Structures in Onion Cells
- Nuclear membrane/envelope: Composed of phospholipid bilayers with pores that facilitate transport.
- Nucleus: Contains the nucleolus and is central to genetic material.
- Nucleolus: A condensed region responsible for ribosomal RNA (rRNA) synthesis.
Unique Features of Onion and Other Cells
- Onion cells lack chloroplasts: Grown underground, thus do not perform photosynthesis.
- Reaction to iodine: Stains onion cells yellowish, enhancing visibility of organelles.
- Vacuole: Occupies the center of each cell, storing substances and maintaining turgor pressure.
Organelles and Their Functions
- Inside the nucleus: Nucleoli are visible; crucial for ribosome assembly.
- Cell wall: Surrounds each cell, providing structural support.
- Plasma membrane: Found just within the cell wall, regulates what enters and exits the cell.
Elodea Cell Characteristics
- Chloroplasts: Present in Elodea, containing chlorophyll, about 30-50 per cell.
- Layer observation: Two layers of cells detected; top layer receives more sunlight, showing more chloroplasts.
- Cell sizes: Larger cells found in the upper layer, smaller in the lower layer.
Cytoplasm and Vacuoles
- Cyclosis: Describes the movement of cytoplasm within the cell.
-
Vacuole functions:
- Stores organic compounds and pigments.
- Provides protection by storing poisons.
- Maintains turgor pressure to keep plants upright.
Eggplant Cell Structures
- Shape of eggplant cells: Spherically shaped, accommodating storage.
- Pigment presence: Anthocyanin, a water-soluble pigment found in vacuoles, gives color.
- Amyloplasts in potato cells: Oval structures responsible for starch storage (amylose and amylopectin).
Chemical Reactions and Cell Types
- Iodine interaction: Turns starch in amyloplasts purple, indicating presence of carbohydrates.
- Stone cells: Composed largely of cell walls made of lignin, providing structural support and are dead at maturity.
- Plasmodesmata: Channels in cell walls allowing nutrient and waste transport, facilitating cell communication.
Summary of Cell Functions
- Purpose of stone cells: Provide structure and support, contributing to the crunchiness of fruits like pears.
- Nuclear envelope: Functions to protect the nucleus while controlling substance passage.
- Stroma: The fluid within chloroplasts where photosynthesis reactions take place.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
Description
Test your knowledge on the structure of onion cells with this labeling quiz. Identify key components like the nuclear membrane, nucleolus, and nucleus, and understand why onions do not have chloroplasts. Perfect for biology students looking to reinforce their learning!