Levels of Organization
What is the smallest level of organization in a living thing?
The Cell
What is the basic unit of life?
The Cell
Which organelle controls many cell activities?
The nucleus
Which type of cell has no nucleus?
Prokaryotic
What is the process of keeping internal conditions stable?
Homeostasis
What comes directly after cells in the organization of a multicellular organism?
Tissues
What does cell theory say all living things are made of?
All living things are made of one or more cells.
Which cell part controls what enters and leaves?
The cell membrane
Which type of cell has a nucleus?
Eukaryotic
Name one way cells help maintain homeostasis.
Cells take in energy, remove waste, or reproduce.
Put these in order: organ, cell, organism, tissue.
cell, tissue, organ, organism
According to cell theory, where do new cells come from?
New cells come from pre-existing cells.
Which organelle releases usable energy from food?
The mitochondria
Are bacteria prokaryotic or eukaryotic?
prokaryotic
Why must cells get rid of waste?
Waste buildup can disrupt cell processes and internal conditions.
What level is made of different tissues working together?
Organs
What are the three main ideas of cell theory?
All organisms are made of cells; cells are the basic unit of life; cells come from pre-existing cells.
Name the plant-cell organelle that captures light energy
The chloroplast
Name one key difference between prokaryotic and eukaryotic cells.
Prokaryotic cells do not have a nucleus; eukaryotic cells do.
How does getting energy from food help cells maintain homeostasis?
Cells use energy to carry out the processes needed to function and keep conditions stable.
Name the levels of organization from atom to organism, in order.
Atom, Molecule, Cell, Tissues, Organ, Organ System, Organism.
How does the idea that cells come from existing cells explain growth?
Existing cells divide to make new cells, increasing the number of cells as an organism grows.
Which structures are found in plant cells but not animal cells: cell wall, chloroplasts, or both?
Both
A cell has DNA but no nucleus. What type is it, and where is its DNA?
Prokaryotic, and the DNA floats in the cytoplasm.
Explain how removing waste helps keep a cell’s internal conditions stable.
Removing waste prevents harmful buildup and helps the cell keep its internal conditions stable.