Download BSCS Biology: Unit 2 Overview

BSCS Biology:
An Ecological Approach
Tenth edition, © 2006 by BSCS
Unit 2 Overview
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3281-CH05.pdf
2/16/05
12:52 PM
Page 119
Continuity of Life
5
The Cell
6
Continuity through Reproduction
7
Continuity through Development
8
Heredity and Genetic Variation
9
Evolution: Patterns and Diversity
I
ndividuals within a population come and go, but the population itself
can exist for a long time. Fossil evidence indicates the biosphere has
endured for more than 3.5 billion years. Thus, there is a continuity in the
biosphere. However, there also is change. The fossil record reveals that
change usually has occurred slowly and systematically. This means that
homeostasis exists between organisms and their environment. Unit 2
considers how continuity is maintained in populations and how populations change across time.
When you look at this photograph of a mother cheetah with her young,
what evidence do you see for continuity of living things? What factors are
responsible for this continuity?
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3281-CH05.pdf
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Page 120
Chapter Topics
Cells Are the Units of Life
5.8 Cells Move Substances in a Variety of Ways
5.1 Cell Theory: The Smallest Unit of Life Is the Cell
5.2 Biologists Use Microscopes to Study Cells
5.3 Cells Are of Two Basic Types
Cell Division
Cell Structure
5.4 Membranes Organize Eukaryotic Cells
5.5 Eukaryotic Cells Contain Various Organelles
Cell Functions
5.6 Cell Activities Require Energy
5.7 Substances Enter and Leave Cells by Diffusion
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5.9 The Cell’s Life Is a Cycle
5.10 Mitosis Is a Continuous Process
5.11 Cells Become Specialized during Development
Investigation 5.1 Observing Cells
Investigation 5.2 Diffusion through a Membrane
Investigation 5.3 Cell Size and Diffusion
Investigation 5.4 Mitosis and Cytokinesis