Levels of Organization
fill in the blank
A. Life’s Organization
1. A large animal is composed of trillions of tiny __________ working
together.
2._____________ organisms are made of only one cell.
B. Unicellular Organisms
1. Unicellular organisms are____________ or prokaryotes.
2. A cell without a membrane-bound nucleus is a(n)________________ cell.
3. A(n) ______________cell has a nucleus surrounded by a membrane and
many other specialized organelles.
C. Multicellular Organisms
1. Each type of cell in a multicellular organism has a specific job that is important
to the ________________of the organism.
2. Cells become different types during ___________
a. Nearly all the cells in an organism have identical ___________
b. Different types of cells use ____________ of the chromosome.
3. _____________ are unspecialized cells that can develop into many
different cell types.
4. Stem cells can produce new muscle cells when _____________ are torn.
5. In plants, unspecialized cells similar to animal stem cells are grouped in areas
Called ______________
6. ________________ are groups of similar types of cells that work together
to carry out specific tasks.
a. Most animals have four main types of tissue—muscle, epithelial,
nervous, and ___________
b. The three main types of plant tissue are dermal, ____________ , and ground tissue.
7.______________ jobs in organisms require more than one type of tissue.
8. ______________are groups of different tissues working together to
perform a particular job. The leaf is a(n) ____________ that specializes
in photosynthesis.
Lesson Outline-Lesson Outline continued
9. ____________are groups of different organs that work together to
complete a series of tasks.
a. One human organ system, the ______________ , includes the stomach
and intestines.
b. Plants have two major organ systems—the shoot system and
the _______________ system.
c.__________________ organisms usually have many organ systems.
d. Each organ system ___________ on the others and cannot work
alone.