CHARACTERISTICS OF LIFE
All living things are made of at least one of these basic units.
What is a cell?
This tool allows scientists to see objects that are too small to see with the naked eye.
What is a microscope?
This structure controls what enters and leaves the cell.
What is the cell membrane?
This structure is found in plant cells but not animal cells and provides support and protection.
What is the cell wall?
A cell needs energy to carry out its activities. Which organelle helps release usable energy for the cell?
What are the mitochondria?
Living things increase in size and go through changes during their lifetime.
What is growth and development?
Robert Hooke used a microscope to observe thin slices of this material.
What is cork?
This jelly-like material fills the inside of the cell and surrounds the organelles.
What is the cytoplasm?
This organelle captures energy from sunlight and uses it to help make food.
What is the chloroplast?
A cell membrane is damaged and can no longer control what enters and leaves the cell. Why would this be a problem?
Because the cell could lose needed materials or allow harmful materials to enter.
This characteristic allows an organism to create new organisms.
What is reproduction?
Hooke used this word to describe the tiny compartments he observed in cork.
What are cells?
This organelle contains DNA and controls many of the cell's activities.
What is the nucleus?
This large structure stores water and other materials in a plant cell.
What is the central vacuole?
Scientists say that cells have different structures that perform different functions. What does this show about how a cell works?
Different organelles work together to help the cell function and survive.
A plant grows toward sunlight. This is an example of an organism responding to this.
What is a stimulus?
A student discovers something that is made of cells, uses energy, grows and develops, responds to stimuli, reproduces, and maintains internal conditions. What conclusion can the student make?
What is the object is a living thing/organism?
These tiny structures make proteins.
What are ribosomes?
A student observes a cell with a cell wall, chloroplasts, and a large central vacuole. What type of cell is it?
What is a plant cell?
A cell's cell membrane becomes damaged and can no longer control what enters and leaves the cell. Why could this prevent the cell from functioning properly?
What is the cell would not be able to properly control the movement of materials into and out of the cell?
An organism sweating when it gets too hot is an example of maintaining this.
What is homeostasis?
During the microscope investigation, students observed cheek cells, onion cells, pond water, and this nonliving sample.
What is salt?
This organelle modifies, sorts, and packages proteins so they can be transported where they are needed.
What is the Golgi apparatus?
A student observes a cell with a nucleus, mitochondria, cell membrane, and lysosomes, but no cell wall or chloroplasts. What type of cell is it?
What is an animal cell?
A cell has a nucleus, mitochondria, ribosomes, and a cell membrane. The mitochondria stop working properly. How could this affect the cell as a whole?
What is the cell would have difficulty getting the energy it needs to carry out its functions?