Study of Biology Characteristics of Life 1 What

Study of Biology Characteristics of Life 1

What is Biology? Biology is the study of all living things Living things are called organisms Organisms include bacteria, protists, fungi, plants, & animals 2

All Living Things Share Common Characteristics 1. Basic Unit is the Cell 2. They Reproduce 3. All Based On Universal Genetic Code (DNA) 4. Grow & Develop 3

Common Characteristics 5. Obtain & Use Materials & 6. 7. 8. Energy Respond To Their Environment Maintain A Stable Internal Environment AS A GROUP, Living Things Evolve, That Is They Change Over Time 4

DOGRACER Acronym DNA Organized (Evolve) Grow Reproduce Adapt (Stable Internal Environment) Cells Energy Respond 5

Characteristics of Organisms 6

All Organisms are made of Cells 7

Facts About Cells are the smallest living unit of an organism All cells contain living material called cytoplasm All cells are surrounded by a cell membrane that controls what enters & leaves the cell 8

More Cell Facts Cells are complex & highly organized Cells have parts called organelles that do different jobs e. g. Chloroplasts in plants make sugars 9

More Cell Facts The simplest cells are called Prokaryotes These cells DO NOT have a nucleus or membrane-bound organelles Bacteria are examples 10

More Cell Facts More complex cells are called Eukaryotes These cells DO have a nucleus and membranebound organelles Plants, animals, protists, & fungi are examples 11

Organisms are Grouped by their Number of Cells Unicellular Organisms – Living Organism Made Up Of One Cell Multicellular Organisms – Living Organism Made Up Of Many, Specialized Cells 12

Organisms Reproduce to Pass on their Genetic Traits 13

Two Types of Reproduction Sexual Reproduction Involves 2 parents Egg fertilized by sperm to make a ZYGOTE Offspring DIFFERENT from parents 14

Two Types of Reproduction Asexual Reproduction Involves a single organism or cell Cell divides Offspring IDENTICAL to parent 15

Cells Have a Genetic Code 16

Genetic Code DNA (deoxyribose nucleic acid) carries the genetic code for all organisms All organisms contain DNA codes for the proteins that make up cells & do all the work 17

Organisms Grow & Develop 18

Growth & Development Organisms grow by producing MORE CELLS & by cell ENLARGEMENT Organisms develop as they mature into an adult organism 19

Cells Require Food & Energy 20

Food Requirements Autotrophs can make their own food Photoautotrophs use sunlight to make food (photosynthesis) Chemoautotrophs use chemicals such as iron & sulfur as their energy 21

Food Requirements Heterotrophs can NOT make their own food They must consume other organisms Herbivores eat plants Carnivores eat meat Omnivores eat plants & animals 22

Metabolism Sum of all the chemical in an organism All require energy Sunlight is the ultimate for life on Earth reactions energy 23

Metabolism Cellular Respiration – Cells releasing the chemical energy stored in foods 6 O 2 + C 6 H 12 O 6 6 CO 2 + 6 H 2 O 24

Organisms Respond to Stimuli Organisms Respond to stimuli (Temperature, Water, Food Supplies, etc. ) In Order To Survive & Reproduce 25

Homeostasis Keeping The Internal Environment (Homeostasis) Of The Cell or Organism Within The Ranges Required For Life Stable internal conditions of p. H, temperature, water balance, etc. 26

Living Things Evolve Groups Of Organisms (Not Individuals) Change Over Time In Order To Survive Within Changing Environments. Fossil records show changes in groups of organisms 27