Characteristics 1
Which characteristic of life is used in all life processes?
Energy
What is reproduction?
The process by which one organism makes one or more new organisms.
What is a cell?
The smallest unit of life.
What made it possible for scientists to discover cells?
The microscope
A network of threadlike proteins that are joined together.
cytoskeleton
Which characteristic of life is the maintaining steady internal conditions when outside conditions change?
Homeostasis
What is a unicellular organism and give an example.
An organism that is only one cell.
Example- an amoeba
Any cell or organism that possesses a clearly defined nucleus.
Eukaryotic cell
What is the main ingredient of a cell?
Water
Which part of a cell makes ribosomes?
nucleolus
What does it mean for an organism to have organization?
All living things have structures that have specific functions.
Living things that are made up of two or more cells.
Multicellular organisms
A type of cell that does not have a true nucleus or membrane-bound organelles.
Prokaryotic cell
A fluid inside a cell that contains salts and other molecules.
cytoplasm
What do mitochondria do?
They are the powerhouse of the cell and create energy from the food we eat through chemical reactions.
What are the two types of stimuli and give example of each.
Internal stimuli- eating when you're hungry
External stimuli- flinching when a ball is thrown at you
What is an organism?
Something that has all the characteristics of life.
What are organelles?
They are eukaryotic cell structures with specific functions.
What is a cell membrane and what is its purpose?
The flexible covering that all cells have and it protects the inside of a cell from the environment outside a cell.
What is a nucleus and what is its job?
The part of a eukaryotic cell that directs cell activities and contains genetic information stored in DNA.
Explain growth and development and give an example.
An organism becoming larger and more advanced.
A tadpole becomes larger and develops arms, legs, and lungs to become a frog.
Explain being able to adapt.
The process of becoming adjusted to an environment.
What are the 3 parts to the cell theory?
1. the cell is the smallest unit of life
2. all cells come from preexisting cells
3. all organisms are made of one or more cells
What is a cell wall and what types of cells have one?
A stiff structure outside the cell membrane and it protects a cell from attack by viruses and other harmful organisms.
Plant, fungal, some protists, and bacterial cells
What cells have chloroplasts and what is their job?
The membrane-bound organelles where photosynthesis takes place to create glucose from light, carbon dioxide, and water.
Plants and some protists have them.