3.2 Science Review Answers

Explain the difference between a unicellular organism and a multicellular organism.

A unicellular organism is a living thing made out of only one cell. A multicellular organism is a living thing made out of two or more cells.

Which is the correct sequence sequence of the levels of organization?

C: Cell, tissue, organ, organ system, organism.

Describe how cell differentiation produces different types of cells in animals.

Cell differentiation is the process by which cells become different types of cells.Different cell types use different parts of the instructions on its chromosomes.

Define cell differentiation in your own words.

Cell differentiation is the process by which cells change in structure and become capable of carrying out specialized functions.

Distinguish between an organ and an organ system.

Organs are groups of different tissues working together to perform a particular job. Organ systems are groups of different organs that work together to complete a series of tasks.

A mistake occurs during mitosis of a muscle stem cell. How might this affect muscle tissue?

The muscle tissue would probably not be able to repair and replace the damaged cells where the mistake occurred.

Copy and fill in the table below to summarize the characteristics of unicellular and multicellular organisms. **look in the book for the table (p.105)**

Unicellular: made of one cell, do not have internal organs, very simple structure, and does not own a nucleus. Multicellular: made of two or more cells, much bigger in size, very complex structure, and has a nucleus.