10 Questions
What is the main function of the cell membrane?
to maintain the integrity of a cell and control passage of materials into and out of the cell
What is the site of ribosome formation in the cell?
the nucleolus
What is the role of proteins in the cell membrane?
to provide structural support, form channels for passage of materials, act as receptor sites, function as carrier molecules, and provide identification markers
What is the medium for chemical reactions in the cell?
cytoplasm
What is the term for the 'little organs' suspended in the cytoplasm of the cell?
cytoplasmic organelles
What is the control center of the cell?
the nucleus
What is the term for the material outside the cell?
extracellular
What is the process by which materials move within the cytoplasm?
diffusion
What is the function of the cytoplasm in the cell?
to provide a platform for other organelles to operate within the cell
What is the material that contains the genetic information of the cell?
deoxyribonucleic acid (DNA)
Study Notes
Cell Membrane
- Separates extracellular material from intracellular material
- Maintains cell integrity and controls passage of materials into and out of the cell
- Composed of a double layer of phospholipid molecules
- Proteins in the cell membrane provide structural support, form channels, act as receptor sites, function as carrier molecules, and provide identification markers
Nucleus and Nucleolus
- Nucleus is the control center of the cell
- Formed by a nuclear membrane around a fluid nucleoplasm
- Contains threads of chromatin with deoxyribonucleic acid (DNA), the genetic material of the cell
- Nucleolus is a dense region of ribonucleic acid (RNA) and the site of ribosome formation
- Nucleus determines cell function and basic structure
Cytoplasm
- Gel-like fluid inside the cell
- Medium for chemical reactions
- Provides a platform for other organelles to operate within the cell
- Site of cell expansion, growth, and replication
- Materials move by diffusion, a physical process that works only for short distances
Cytoplasmic Organelles
- "Little organs" suspended in the cytoplasm
- Each type has a definite structure and specific role in cell function
- Examples: mitochondrion, ribosomes, endoplasmic reticulum, golgi apparatus, and lysosomes
Learn about the cell membrane, its structure as a phospholipid bilayer, and its role in maintaining cellular integrity and controlling the passage of materials into and out of the cell.
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