Transcript 1-3 Studying Life

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Basic unit is the cell
Reproduce
Have DNA
Grow & develop
Obtain & use energy
Respond to their environment
Maintain homeostasis
AS A GROUP, living things
change over time (evolve)
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Cells are the smallest
living unit of organisms.
 Cells are complex and
highly organized.
 Organisms may be
composed of a single cell
(like bacteria) or many
cells (like plants, animals,
and fungi).
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Sexual Reproduction
Involves 2 parents
Egg fertilized by sperm to make a ZYGOTE
Offspring DIFFERENT from parents
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Asexual reproduction
Involves a single
organism or cell
Cell divides
Offspring IDENTICAL to
parent
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DNA (deoxyribose
nucleic acid) carries
the genetic code for all
organisms
 All organisms contain
DNA
 DNA codes for the
proteins that make up
cells & do all the work
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Organisms grow by producing more cells & by cell
enlargement
 Organisms develop as they mature into an adult
organism
 Monarch to chrysalis
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Autotrophs can make
their own food
Heterotrophs can NOT
make their own food
These cyanobacteria stromatolites are in
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shark bay, Australia. They are
Organisms respond to temperature, water, food
supplies, etc. in order to survive & reproduce
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Keeping the internal
environment of the cell
or organism within the
ranges required for life
 Stable internal
conditions of pH,
temperature, water
balance, etc.
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Groups of organisms (not
individuals) change over
time in order to survive
within changing
environments.
 Fossil records show
changes in groups of
organisms
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 Atoms
 Molecules
 Organelles
 Cells – life starts here
 Tissues
 Organs
 Organ System
 Organism
 Population
 Community
 Ecosystem
 biosphere
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 Boston
Dynamics
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