characteristics of living things what does it mean to be alive?

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The Big Ideas… Made of Cells Reproduce (sexually or asexually)

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Page 1: Characteristics of Living Things What does it mean to be alive?
Page 2: Characteristics of Living Things What does it mean to be alive?

Characteristics of Living ThingsWhat does it mean to be

alive?

Page 3: Characteristics of Living Things What does it mean to be alive?

The Big Ideas…• Made of Cells• Reproduce (sexually or asexually)

Page 4: Characteristics of Living Things What does it mean to be alive?

Living things are made of units called cells

• The cell is the smallest part of an organism that is considered alive.

• Organisms can be unicellular (one cell) or multicellular (many cells)

Page 5: Characteristics of Living Things What does it mean to be alive?

Living things reproduce• All living organisms come from

other living things.• Sexual reproduction – two cells

from different parents.• Asexual reproduction – Offspring is

created from a single parent.

Page 6: Characteristics of Living Things What does it mean to be alive?

The Big Ideas…• Made of Cells• Reproduce (sexually or asexually)• Have DNA (genetic information)• Grow & Develop

Page 7: Characteristics of Living Things What does it mean to be alive?

Living things have a universal genetic code (DNA)

• Directions for inherited traits are included in an organisms DNA

• Living things make copies of themselves; to do so they pass on genes.

• All organisms have the same basic DNA structure.

Page 8: Characteristics of Living Things What does it mean to be alive?
Page 9: Characteristics of Living Things What does it mean to be alive?

Living things grow and develop• Some organisms increase in size

(unicellular).• Some organisms start as a single

cell that grows, divides into two that stay connected and grows again (multicellular).

Page 10: Characteristics of Living Things What does it mean to be alive?

The Big Ideas…• Made of Cells• Reproduce (sexually or asexually)• Have DNA (genetic information)• Grow & Develop• Need/Use Energy (metabolism)• Respond to Environment

Page 11: Characteristics of Living Things What does it mean to be alive?

Living things need and use materials for energy (nutrient source)

• Nutrient source allows for chemical reactions that take place in cells.

• Materials come from surrounding environment.

• Metabolism is the combination of all the chemical processes in an organism that build up or break down materials.

Page 12: Characteristics of Living Things What does it mean to be alive?

Living things respond to their environment

• Reaction to immediate changes or needs (stimulus)

• Light, temperature, other organisms, hunger

Page 13: Characteristics of Living Things What does it mean to be alive?

The Big Ideas…• Made of Cells• Reproduce (sexually or asexually)• Have DNA (genetic information)• Grow & Develop• Need/Use Energy (metabolism)• Respond to Environment• Maintain Homeostasis (constant internal environment)• Change Over Time (evolve)

Page 14: Characteristics of Living Things What does it mean to be alive?

Living things maintain an internal balance• External conditions may change dramatically, but most organisms must

keep internal conditions relatively steady.• Called homeostasis• Connects with responding to our environment.

Page 15: Characteristics of Living Things What does it mean to be alive?

• Adaptations are beneficial inherited traits that are passed to future generations.

• Evolution can occur through natural selection of adaptations.

• The genetic makeup of a population changes.

Evolution is the change in living things over time

Page 16: Characteristics of Living Things What does it mean to be alive?

The Big Ideas…• Made of Cells• Reproduce (sexually or asexually)• Have DNA (genetic information)• Grow & Develop• Need/Use Energy (metabolism)• Respond to Environment• Maintain Homeostasis (constant internal environment)• Change Over Time (evolve)• Form Systems & Have Systems (related parts)• Structure & Function are Related

Page 17: Characteristics of Living Things What does it mean to be alive?

All levels of life have systems of related parts• A cell is a system of

chemicals and processes.• A body system includes

organs that interact.• An ecosystem includes

living and nonliving things that interact.

Page 18: Characteristics of Living Things What does it mean to be alive?

Structure determines function.

• Cells have a different structures and functions in complex organisms. (specialization)

• Different species have different anatomical structures with different functions.

Page 19: Characteristics of Living Things What does it mean to be alive?

…and now for Marty’s story.