Question

lesson 2
levels of organization
directions: on the line before each definition, write the letter of the term that matches it correctly. each term is
used only once.

1. a cell that can become many different cell types

a. cell differentiation

1. a group of similar cells that work together to

b. stem cell
carry out a specific task
c. tissue

1. a group of different organs that work together to

d. organ
complete a series of tasks
e. organ system

1. the process by which cells becomes different

f. organism
types of cells

1. a group of organ systems that carry out all the

jobs needed for their survival

1. a group of different tissues working together to

perform a particular job
directions: circle the term in parentheses that correctly completes each sentence.

1. cells work together in a (multicellular/unicellular) organism.
2. a cell in a (multicellular/unicellular) organism must carry out all the activities that are

necessary to survive.

1. different types of cells in a multicellular organism have (different/the same)

chromosomes.

1. multicellular organisms are (eukaryotes/prokaryotes).

Explanation:

1. A stem cell has the ability to differentiate into many different cell types.
2. Tissue is defined as a group of similar cells working together for a specific task.
3. An organ system is made up of different organs working together for a series of tasks.
4. Cell differentiation is the process by which cells become different types.
5. An organism is composed of organ systems that carry out all survival - related jobs.
6. An organ is formed by a group of different tissues working together for a particular job.
7. In a multicellular organism, cells work together.
8. A cell in a unicellular organism must perform all survival activities.
9. Different types of cells in a multicellular organism have the same chromosomes (they just express different genes).
10. Multicellular organisms are eukaryotes as prokaryotes are mostly unicellular.

Answer:

1. B
2. C
3. E
4. A
5. F
6. D
7. multicellular
8. unicellular
9. the same
10. eukaryotes