Thursday, February 7, 2008

Cell-ebrety Squared Video Questions

There are 5 basic life functions
1. Growth and Development
2. Use energy

3. Reproduce
4. Respond to environment
5. To get rid of wastes

All living things have certain things in common
1. Adaptation to their environment
2. Ability to use energy
3. Sensitive to environment
4. Reproduction
5. Ability to grow
6. Cells

The building blocks of life are cells.
All cells in a human are not the same. Please give examples of at least two different types of cells in humans. Tissue cells, muscle cells.
Why are cells not the same? Because groups of cells (tissues) are "programmed" to perform different tasks in the body.

The first person to discover cells was Robert Hook. He called them cells because they looked like tiny rooms. He first saw cells when he was looking at a piece of cork under a microscope.
The cell theory was created by Matthias Schleiden and Theodor Schwann.

The three main ideas in the cell theory are
1. Cells are the basic unit of life
2. All organisms are composed of one or more cells
3. All cells arise from preexisting cells

Unlike animal cells, plant cells contain the organelles chloroplast and cell wall.
All animal cells are covered in a cell membrane. The function of this is to protect the cell's organelles, hold the parts together, and allow chemicals/nutrients to pass to and from the cell.
The different parts of the cell are known as organelles. Each organelle has a specific function. The function of the nucleus is the controller of the cell's functions. The mitochondria are also known as the power plants of the cell because their function is to break down food and aquire the energy produced by doing so. Storage is the main function of the vacuole.

Bacteria are interesting organisms. Bacterial cells do not have a nucleus.
Instead the chromosomes of the cell are located throughout the cell.
There are different types of transport used in cells as well. Diffusion is the movement of particles from high concentration to low concentration. Osmosis is different than this because it requires water and materials crossing over a membrane.
What is the difference between active and passive transport? Passive transport happens without using energy and active transport requires energy because the particles passing are bigger.
What organelle makes the energy used in active transport? Mitochondria.

Is a virus a living cell? No.
What is contained inside a virus? Part of a chromosome.
What is the only life function of a virus? Reproduction.

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