Cell Theory
Who laid the foundation for the Cell Theory?
Robert Hooke
Why do plant cells have a large central vacuole?
Plants don't possess the ability to move freely like animals. Thus, they possess large vacuoles as a reservoir in unfavorable conditions.
Unicellular organisms take in materials directly from their __________.
Surroundings
Why does injury or death of some cells in multicellular organisms usually not affect them?
Injury or death of some cells does not affect the organisms as the same can be replaced by new one.
Function --> mitochondria
Provides energy to the cell. POWERHOUSE
Cells are the _________ unit of life that make up all living organisms.
Hint: The answer is not "basic"
Smallest
What is the outermost layer of a plant cell?
Cell Wall
Why do unicellular organisms have a short lifespan than multicellular organisms?
Unicellular organisms only have one cell with a heavy work load meaning they cannot live as long.
What is cell specialization?
If a cell is specialized, it has unique structures that allow it to carry out its function in the body. All cells start as stem cells, which are cells that can become many other types of cells. They go through a process called differentiation to become specialized.
Function: lysosomes
Break down waste materials
How has the cell theory been used?
Disease/Health/Medical Research and Cures
In plants, photosynthesis takes place in chloroplasts. Explain this process.
Photosynthesis is the process by which plants use sunlight to convert carbon dioxide and water into oxygen and sugar (glucose).
Why don't unicellular organisms grow to a larger size like multicellular organisms?
A cell body cannot attain a large size because of the limit imposed by surface area to volume ratio. it would not be able to support such a size.
What are the 5 levels of cell organization?
Cell, Tissue, Organ, Organ System, Organism
Function --> nucleolus
Function --> nucleus
Nucleolus: The nucleolus aids in the production of ribosomes.
Nucleus: Control center of the cell that directs functions and contains DNA.
What are the three main principles of the Cell Theory?
1. All living things are composed of cells.
2. The cell is the basic unit of life.
3. All cells come from preexisting cells.
Cell membranes serve as barriers and gatekeepers. They are __________, which means that some molecules can diffuse across the lipid bilayer but others cannot.
semi-permeable
What are the six life functions?
Growth, Movement, Reproduction, Excretion, Nutrition, Respiration
Why does regeneration decrease with increased specialization?
Answers vary
Function --> Centrioles
Centrioles in the centrosomes help the cell divide during mitosis