Characteristics of Organisms

Tuesday 2/25/25 Do Now

1. Six scientists help develop cell theory: Hooke, Redi, Leeuwenhoek,

Schleiden, Schwann, and Virchow. Place each scientist with the part
of the cell theory their research helped create. Scientists can be
used more than once.

Homework: Complete
any basic characteristics

of life assignments

Materials:

1. Notebook
2. Planner
3. Pencil

Part of Cell Theory

Scientist involved

All cells come from other pre-
existing cells

All organisms are made up of 1 or
more cells

Cells are the basic unit of
structure and function in
organisms

© The Science Duo

•

An organism whose cells lack a nucleus and other
organelles (Pro = NO)

•

Nucleoid – central part of the cell where the DNA is
located

•

Microscopic

Examples of Prokaryotes

Streptococcus

pyogenes

Salmonella

Escherichia

coli

•

An organism whose cells contain a nucleus and other
organelles (Eu = TRUE)

•

Nucleus – part of the cell where the DNA is located

•

Most are able to be seen, but some are microscopic

Examples of Eukaryotes

Tiger

Mushroom

Amoeba

Multiple Choice

____________a membrane bound organelle that contains the cell’s DNA.

• Cell Wall

• Cell Membrane

• Organelle

• Nucleus

Multiple Choice

The difference between a prokaryotic cell and a eukaryotic cell is that

• only one has a nucleus

• they are not different

• one is blue, the other is red

Multiple Choice

_________is a single-celled organism that does not have a nucleus or membrane-bound organelles.

• Prokaryote

• Eukaryote

• Unicellular

• Multicellular

Multiple Choice

_________is an organism made up cells that contain their DNA in a nucleus.

• Prokaryote

• Eukaryote

• Unicellular

• Multicellular

Paramecium

Phytoplankton

Euglena

•

An organism that is made up of only 1 cell

•

Uni = one

•

Microscopic and many are found in water

Examples of Unicellular Organisms

Ant

•

An organism that is made up of many cells (2 or more)

•

Multi = many

•

Some may be very small and others very large

Examples of Multicellular Organisms

Elephant

Cactus

Multiple Choice

An organism with only one cell is known best as...

• a disease

• plankton

• multicellular organism

• unicellular organism

Multiple Choice

An organism with more than one cell is known as a/an

• organ system

• multicellular organism

• unicellular organism

Multiple Choice

Which organism represents a multicellular organism?

Multiple Choice

____________organisms made up of one cell.

• Cell

• Unicellular

• Organisms

• Multicellular

Grass

Algae

Oak Tree

•

An organism that is able to produce its own food
through the process of photosynthesis

•

Auto = self; Troph = nourish/feeder

•

A large majority are green plants

Examples of Autotrophs

Hawk

Bear

Grasshopper

•

An organism that must consume other organisms in
order to obtain energy

•

Hetero = different or other; Troph = nourish/feeder

•

Many belong to the animal, protist, and fungi kingdoms
of life

Examples of Heterotrophs

Multiple Choice

Autotrophs ____

• Eat other organisms

• Make their own food

• Consume dead organisms

• Only drink water

Multiple Choice

Heterotrophs ___

• Make their own food

• Consume only plants

• Use photosynthesis

• Eat other organisms

Multiple Choice

Another word for autotroph is ___

• Consumer

• Predator

• Producer

• Decomposer

Multiple Choice

An organism with more than one cell is known as a/an

• organ system

• multicellular organism

• unicellular organism

Multiple Choice

Another word for heterotroph is ___

• Consumer

• Decomposer

• Producer

• Prey

Multiple Choice

This is a Okapi. It eats leaves to survive. What kind of organism is it?

• Heterotroph

• Autotroph

Multiple Choice

This is corn. It makes its own food through photosynthesis. What kind of organism is it?

• Heterotroph

• Autotroph

•

5 checkpoint questions

•

Discuss each question with a partner

•

Write a complete answer to each question on
your notes page

Identify 3 organisms

that would be
classified as
eukaryotic,

multicellular, and

heterotrophic.

Humans, Cats, Birds,

Dogs, Elephants,
almost all animals

How would a

cactus be
classified?

Eukaryotic,
Multicellular,
Autotrophic

Describe the main

difference
between an

autotroph and a

heterotroph.

Autotrophs make their
own energy through

photosynthesis.

Heterotrophs must eat

to gain energy.

How do

unicellular and

multicellular

organisms differ?

Unicellular only have 1

cell and are microscopic.
Multicellular are made of
more than 1 cell and can

be a variety of sizes.

Question 5

How do

prokaryotic and

eukaryotic

organisms differ?

Prokaryotes do not
have a nucleus and

other organelles.
Eukaryotes have a

nucleus and complex

organelles.

Tuesday
Activities

Autotroph = Self Nourish (CAN produce its own food, gets its energy from the sun & uses photosynthesis)


Heterotroph = Different Nourishment
(Can NOT produce its own food, must get nutrients from other sources)

When you are complete, show it to me to check that it is correct for a STICKER.

Tuesday
Activities

Tuesday Exit Ticket

• What part of eukaryotic cells contains genetic material and controls

cells activities?

• What is the difference between unicellular and multicellular?