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Introduction to Biology

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Introduction to Biology. To study living things, we also categorize and classify organisms: ... Introduction to Biology. The scientific method- How do things ... – PowerPoint PPT presentation

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Title: Introduction to Biology


1
Introduction to Biology
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Introduction to Biology
What is Biology?
It is the study of life, living things, what they
are, how they work, and how they interact with
one another and their environment.
What are the Characteristics of living things?
1. Complex, organized structure, consisting of
mostly organic (carbon based) molecules.

2. Maintain complex structure and internal
environment - homeostasis.
3. Acquire and use material and energy from the
environment to maintain homeostasis.
4. Grow
5. Reproduce, using molecular blueprint called DNA
6. Respond to stimuli from environment
7. Have capacity to Evolve
3
Introduction to Biology
As part of this course, we will consider biology
at different levels
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Introduction to Biology
5
Introduction to Biology
To study living things, we also categorize and
classify organisms
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Introduction to Biology
Evolution as the unifying theory of biology
Darwins theory of evolution by natural selection
1. Genetic variation
2. Inheritance of variation by offspring
3. Natural selection Selects for adaptations
that enhance a) survival b)
reproduction
Sources of Variation?
1. Mutations most destructive, but
2. Sexual reproduction -
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Introduction to Biology
The scientific method- How do things work?
Steps
1. Observation
2. Hypothesis
3. Experiment
4. Conclusion
Tested hypothesis gtgtgtgtgtgtgtgtgtgtgtgtgtgtgtgtgtgtgtgtgtgtgt Theory!!
For experiments to be valid and useful, consider
a. controls, and b. adequate sample sizes
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Atoms, Molecules, and Chemistry!!!
Next lecture
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