Cell Basics
The smallest unit of life.
Cell
An example of a unicellular organism that lives in water.
amoeba
An example of a multicellular organism.
plant/animal/fungi/human
Both unicellular and multicellular organisms need this to survive.
Energy and Food
Do trees have more or fewer cells than humans?
More
Organisms made of only one cell.
Unicellular
A unicellular organism used to make bread rise
Yeast
Muscle cells, blood cells, and nerve cells are all examples of this.
Specialized cells
Which type of organism can do all life processes within a single cell?
Unicellular
Both humans and trees are multicellular. What’s one job a human cell does that a tree cell does not?
send nerve signals
The part of a cell that controls the activities. The boss.
The Nucleus
True or False: Unicellular organisms can carry out all life processes.
true
Even though unicellular organisms (like bacteria, amoebas, or yeast) are made of just one cell, that single cell is able to:
Take in food (nutrition)
Make energy (respiration)
Get rid of waste (excretion)
Grow
Reproduce
Respond to the environment
The organ system that helps you breathe.
Respiratory system
true or false: Unicellular and multicellular organisms grow and reproduce
True
True or False: A bacterium has fewer cells than a leaf.
true
What is one thing plant cells have that animal cells dont?
Chloroplast
True or false: Unicellular means more than one cell
False
What do white blood cells do?
White blood cells are like the soldiers of your body.
Their main job is to fight germs, bacteria, and viruses that can make you sick.
How many cells does a human have?
a. 7
b. 3489
c. 37 trillion cells
c
Plant cells have this tough outer layer, but animal cells do not.
Cell wall
What is a cell wall?
It gives the cell shape, structure, and protection.
Are Humans unicellular?
NO
These cells carry oxygen throughout the body.
Red Blood Cells
Explain one way unicellular and multicellular organisms are the same, and one way they are different.
Same: Both are made of cells / carry out life processes.
Different: Unicellular = one cell does everything; Multicellular = many specialized cells share the work.
True or False: Fish are unicellular organisms.
False