1.2 Unifying Themes of Biology

KEY CONCEPTUnifying themes connect concepts from many fields of biology.

1.2 Unifying Themes of Biology

All levels of life have systems of parts that interact

A system is group of related parts that interact to form a whole

1.2 Unifying Themes of Biology

Biologists study many different systems from the molecular to the biosphere level.

1.2 Unifying Themes of Biology

All levels of life have systems of parts that interact.

Cells have structures called organelles, each with their own job, which work together to keep the cell alive.

1.2 Unifying Themes of Biology

All levels of life have systems of parts that interact.

An Organ System is made up of individual organs that work to carry out specific jobs. Ex. Digestive

1.2 Unifying Themes of Biology

All levels of life have systems of parts that interact.

An Organ System is made up of individual organs that work to carry out specific jobs. Ex. Digestive

The Human Organism has 11 different organ systems thatWork together as one big system

Can you name them all?

1.2 Unifying Themes of Biology

All levels of life have systems of parts that interact.

Ecosystems (ecological system) include living and nonliving things that interact to maintain Earth’s life.

1.2 Unifying Themes of Biology

Structure determines function are related in biology.

Protein molecules with different structures perform different functions.

1.2 Unifying Themes of Biology

Structure and function are related in biology.

– Cell structure determines the job it can do

1.2 Unifying Themes of Biology

Structure and function are related in biology.

– Cell structure determines the job it can do

1.2 Unifying Themes of Biology

Structure and function are related in biology.

• Structure determines function.

Different species have different anatomical structures with different functions.

1.2 Unifying Themes of Biology

Organisms must maintain homeostasis to survive in diverse environments.

• Homeostasis is the maintenance of constant internal conditions.

1.2 Unifying Themes of Biology

– Homeostasis is usually maintained through negative feedback.

– Negative feedback systems return a condition to its normal (set) point.

• Homeostasis is the maintenance of constant internal conditions.

1.2 Unifying Themes of Biology

• Behaviors and adaptations can help maintain homeostasis.

1.2 Unifying Themes of Biology

Evolution explains the unity and diversity of life.

• Evolution is the change in living things over time.– The genetic makeup of a population of a species

changes.– Evolution can occur through natural selection of

adaptations.– Adaptations are beneficial inherited traits that are

passed to future generations.

1.2 Unifying Themes of Biology

• Evolution accounts for both the diversity and the unity of life.

1.2 Unifying Themes of Biology

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