UNIT 1: THE NATURE OF LIFE

CHAPTER 1: THE SCIENCE OF BIOLOGY

Ms. PetrucciBiology

Chapter 1: The Science of Biology

Vocabulary

Section 1-3: Studying Life

• Biology• Cell• Homeostasis• Sexual Reproduction• Asexual Reproduction• Stimuli• Metabolism

1-3 Studying Life

• What are the Characteristics of living things?

• How can live be studies at different levels?

• Define Biology

To be classified as a living thing, an object must have all eight of the following characteristics:

• Living things:• Are made up of units called cells• Reproduce• Are based on a universal genetic code• Grow and develop • Obtain and use materials for

energy• Respond to their environment• Maintain homeostasis• Taken as a group, change over

time (evolution)

1. Living things are made up of units called cells

• Cell - smallest unit of life• unicellular = single celled• Multicellular = many celled

2. Living Things Reproduce

• Sexual Reproduction• Asexual Reproduction

3. Living things are based on a universal genetic code

http://www.pbs.org/wgbh/nova/genome/dna.html

4. Living Things Grow and Develop

Differentiation

5. Living Things Obtain and Use Materials and Energy

6.Living Things Respond to Their Environment

7. Living Things Maintain a Stable Internal Environment

8. Living Things (Group) Change Over Time

Big Ideas in Biology

• Science as a Way of Knowing• Interdependence in Nature• Matter & Energy• Cellular Basis of Life• Information and Heredity• Unity & Diversity of Life• Evolution• Structure & Function• Homeostasis• Science, Technology & Society

Branches of Biology• Zoology = animals• Paleontology = ancient life• Cytology = cells• Botany = plants• Entomology = insects• Microbiology = • Ecology =

Levels of Organization• The living world can be organized into different levels. For

example, many individual organisms can be organized into the following levels:

•Molecule

•Cell

•Tissue

•Organ

•Organ System

•Organism

More Organizational Levels• There are also levels of organization above the individual

organism.

•Population

•Community

•Ecosystem

•Biome

•Biosphere

Diversity of Life

biodiversity