UNIT 1
CHARACTERISTICS
OF LIFE
CH2 - P. 27-31
CH5 - P. 87-102
Unit 1 - Outline
• Describe the characteristics of living things p. 27-31
• Explain the role of homeostasis p. 31
• Compare and contrast a prokaryotic cell with a eukaryotic
cell p. 92
• Compare plant and animal cells p. 87-98
• State the roles of the cells organelles p. 89-97
• Describe the relationship of the cell membrane and the
cell wall to osmosis p. 97, 100-102
• Compare sexual and asexual reproduction and the benefits
of each p. 28
• Demonstrate the use of the microscope, magnification,
and lab drawings
CHARACTERISTICS OF
LIFE
ALL LIVING THINGS:
• are made up of one or more units called cells
• Reproduce
• Grow & develop
• Obtain & use energy
• Respond to their living environment
Living things are made up
of cells
• Unicellular = one celled organism
• Multicellular = hundreds to trillions of cells
working together
Living things Reproduce
• Asexual Reproduction: single organism reproduces
without the aid of another
• Sexual Reproduction: two cells from different
individuals unite to produce the first cell of the new
individual
Living things Grow and
Develop
• Most living things go through a cycle of change
called development
• Then comes aging where reproduction stops
• lastly inevitably comes death which is also a process
that separates living from non-living things
Living things obtain and
use energy
• Anabolism: synthesis of complex substances from
simpler ones
o Photosynthesis in plants
• Catabolism: breakdown of complex substance to
simple
o digestion in animals
• Metabolism: sum of anabolism and catabolism
Living things Respond to
their Environment
• The ability of living things to respond to stimulus is
called irritability
• Homeostasis: organisms ability to maintain
constant/stable conditions suitable for life
SECTION 2-1 - SECTION
REVIEW
P. 31 #1-4 - Due next class!
1. Define the five characteristics of living things and
give an example of evidence for each
2. Compare and contrast sexual and asexual
reproduction. What are the positives and negatives
of both?
SECTION 2-1 - SECTION
REVIEW
3. Define Metabolism in terms of catabolism and
anabolism
4. Think of a non-living thing that satisfies each of the 5
characteristics of life. Does any non-living thing
have all the characteristics of life?