Wed, March 5th: Gummy Bear Lab Day 2/ 7.4 Notes*/7.4
WS*
7.4 Homeostasis and Cells
I. The Cell as an Organism
A. There are many _______ _________-celled organisms on Earth
there are organisms with _______ cells
B. Just like other ___________ things, single-celled _____________ must
maintain ______________: relatively constant _____________ physical
and chemical ________________
1. To maintain homeostasis, single-celled organisms _______,
_____________ to the environment, __________ food or sunlight
into useful ___________, and _______________
C. Single-celled organisms include both _____________ and
________________
II. Multicellular Life
A. Cell Specialization
1. Different kinds of ________ have different ________
2. Each ______________ cell helps the organism _____________
homeostasis
B. Levels of Organization
1. Tissue: a __________ of similar ________ that perform a particular
function
2. Organ: a _________ of _________ that work ____________ to
perform closely related functions
3. Organ system: a ________ of ________ that work together to
perform a ____________ function
C. Cellular Communication
1. Cells in a __________ organism use chemical ___________ to
communicate
Name
Class
Date
7.4 Homeostasis and Cells
The Cell as an Organism
For Questions 1–5, complete each statement by writing the correct word or words.
1. The term
a living cell.
refers to the relatively constant internal physical and chemical state of
2. Unicellular prokaryotes, called
number of different places.
, are adapted to living in a remarkable
3. Some unicellular eukaryotes, called
4. Yeasts are unicellular
, contain chloroplasts.
, which are eukaryotes.
5. Other unicellular eukaryotes include
and algae.
6. How do single-celled organisms maintain homeostasis?
7. Why is maintaining homeostasis particularly important to single-celled organisms?
Multicellular Life
8. How are the cells of a multicellular organism like a baseball team?
9. How does a multicellular organism maintain homeostasis?
Multicellular Life
The levels of organization in a multicellular organism are cells, tissues, organs, and organ systems.
Follow the directions.
10. Draw an arrow from the drawing that shows the least complex level of organization to the
next most complex level of organization.
11. Draw an arrow to the next most complex level of organization.
12. Draw an arrow to the most complex level of organization.
Organ system
Tissue
Cell
Organ