Chapter 1 - An Introduction to Biology

Chapter 1 - An Introduction to Biology - An Introduction to...

Info iconThis preview shows pages 1–9. Sign up to view the full content.

View Full Document Right Arrow Icon
Click to edit Master subtitle style 4/30/11 An Introduction to Biology Chapter 1
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
4/30/11 Properties of Life Unity All modern forms of life display a common set of characteristics Based on biological evolution Diversity Many types of environments with diverse organisms
Background image of page 2
4/30/11 Seven Characteristics of Life 1. Cells and organization 2. Energy use and metabolism 3. Response to environmental changes 4. Regulation and homeostasis 5. Growth and development 6. Reproduction 7. Biological evolution
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
4/30/11 Levels of Organization 1. Atoms 2. Molecules and macromolecules 3. Cells 4. Tissues 5. Organs 6. Organism 7. Population 8. Community 9. Ecosystem
Background image of page 4
4/30/11 Evolutionary History Life began on Earth as primitive cells 3.5-4 billion years ago Primitive cells - evolutionary changes - rise to the species we see today Understanding evolutionary history helps us understand the structure and function of an organism’s body
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
4/30/11 Two mechanisms of evolutionary change 1. Vertical descent with modification Progression of changes in a lineage New species evolve from pre-existing species by the accumulation of mutations Natural selection takes advantage of beneficial mutations Tree of life focuses on vertical evolution
Background image of page 6
4/30/11 2. Horizontal gene transfer Genetic exchange between different species Relatively rare Genes that confer antibiotic resistance are sometimes transferred between different bacteria species Web of life includes the contribution of horizontal gene transfer
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
4/30/11 Classification Taxonomy is the grouping of species based on common ancestry
Background image of page 8
Image of page 9
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 21

Chapter 1 - An Introduction to Biology - An Introduction to...

This preview shows document pages 1 - 9. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online