characteristics of life chapter 1, section 3. biology = the study of life what does it mean to be...
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Characteristics of Life
Chapter 1, Section 3
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Biology = the study of life
What does it mean to be alive???
• There are 8 characteristics of life . . . – No single characteristic is enough to
describe a living thing . . .
– They must have all eight.
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8 Characteristics of Life
1. Living things are made up cells.2. Living things reproduce.3. Living things are based on a
universal genetic code (DNA).4. Living things grow and develop.
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8 Characteristics of Life (cont.)
5. Living things obtain and use materials and energy.
6. Living things respond to their environment.
7. Living things maintain a stable internal environment. (homeostasis)
8. Taken as a group, living things change over time.
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1—Made up of cellsThey can be either unicellular or multicellular.
Picture of a Cell
***Unicellular = made up of ONE cellPicture of a unicellular organism.
***Multi-cellular = made up of MORE than one cellPicture of multicellular organisms
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2—Reproduction
***asexual = reproduction that requires ONE parent
***sexual = reproduction that requires TWO parents
There are 2 types of reproduction:
1. Asexual 2. Sexual
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3—Based on a genetic code
***DNA = DNA is the genetic code found in every cell. DNA is inherited from parents and controls your traits.
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4—Grow and Develop
***Think about it . . . Do you look the same as
when you were born????
**All living things grow and develop during at least part of their life.
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5—Need for materials and energy
**Living things need a constant supply of materials and energy.
**Metabolism = the process of using those materials.
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6—Response to the environment
**Internal stimuli = signal comes from inside the organism
**Organisms detect and respond to STIMULI (or signals) from their environment.
**External stimuli = signal comes from outside the organism
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7—Maintaining internal balance Despite changing conditions around
them, organism must keep their internal
conditions stable/balanced.
**Homeostasis = the process of keeping the internal environment stable/balance/constant
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8—Change over time
Over hundreds, thousands, and millions of years, organisms have the potential to change =
evolution