*Essential Question: Identify the characteristics of life.

Aim#3: What are the characteristics of life?

Textbook 1.3-Studying Life (p.17-23)

9/11/13

HW#3_______Read p.22-23-Fields of Biology: Read  about a few fields in biology and write a short summary of the one that interested you the most.  Explain why this field appealed to you.

HW#4 ________ Research 7 facts about pill bugs (isopods, pill bugs, sow bugs, rollie pollies)

Over the weekend- Collect pill bugs.  Try to collect 10 of them. Place them in a small margarine or chinese food container with some tiny holes, place a moist towel in the container and a slice of potato and a tiny bit of soil. Label the container with your name and the period that your class meets for biology. Bring these in on Monday (if you do not have pill bugs on Monday, you will not be able to complete the pill bug lab). 

What you will need to do:1. Clean out a margarine/Chinese food container2. Poke a few holes into the cover of container3. Crumple and moisten a paper towel and place in the

container4. Slice a piece of potato or apple and put into container5. Carefully find pill bugs, place into container and cover6. Wash your hands and bring in to class on Monday to

start Lab!

Isopods:Breath with gillsRestricted to areas with high humidity (moist)omnivores/scavengersharmlesslive 2 to 3 yearsseven pairs of legslike rotting vegetation4000 speciesmolt external skeletonfertilized eggs hatch from ventral pouchremove toxic metals from the soil!

Three Main Body Parts:

Head Thorax

Abdomen

Color: dark gray to white

Pill Bugs

Sow Bugs

We now know that Life CAN NOT be defined !!!

However… we CAN explain LIFE by describing characteristics of living things

2)What is BIOLOGYBIOLOGY?

The Study of life!!

2. What is

Biology?

a. Origins and history of life

b. Structures of living things

c. Interactions of living things

d. Function of living things

3. What do biologists do?

a. Study the diversity of life

*What type of life forms do we study?

b. Research diseases*What diseases are in the news?

c. Develop technologies*How do we

improve technology?

d.Improve agriculture*How can we improve

agriculture?e. Preserve the environment

*How do we preserve nature?

4. Characteristics of Life:

LIVING THINGS…a. Are made up of one or more cells

i. Unicellular vs. Multicellular

a.Display organizationi. For example:

- Organelles in a Paramecium- Specialized cells in multicellular organisms (ex. blood cells)

4. Characteristics of Life:

c. Grow and Developi. Growth-

ii. Development-

d. Reproducei. Neutered dogs and cats?

ii. Species-

4. Characteristics of Life:

e. Respond to stimulii. Stimulus-

ii. Response-

iii. Examples?

f. Require energyi. Metabolism:

i. Autotroph vs. Hetertroph:

4. Characteristics of Life:

g. Maintain Homeostasisi. Homeostasis-

ii. For example: Changes in altitude

g. Have adaptations that can evolve over time (evolution)i. Adaptation:

i. Why are adaptations important?

M metabolismR regulationS synthesisT transportR respirationA assimilationN nutritionG growthE excretionR reproduction

M metabolismRSTRANGER

METABOLISMMETABOLISM

- the total of ALL the life activities required to sustain life.

- it is ALL THE LIFE PROCESSES TOGETHER.

**includes activities that build substances as well as those that break down substances.

MR regulationSTRANGER

REGULATION- the CONTROL and COORDINATION

of various activities of an organism.- it involves responding to stimulistimuli.KEY WORDS:controlcoordinateregulateresponsestimulusdetect

MRS synthesisTRANGER

SYNTHESIS- chemical activities by which an

organism builds large, more complex molecules from smaller, less complex molecules.

Key Words:Form BuildMake CreateSynthesize Produce

MRST transportRANGER

TRANSPORT- the ABSORPTION of materials into the

organism AND CIRCULATION of materials throughout the organism.

Key words:

Circulate Absorb

Distribute Movement

Take in

MRSTR respirationANGER

RESPIRATION

- Breaking down food to generate ENERGY

KEY WORDS:

**MAKING ENERGY**

MRSTRA assimilationNGER

ASSIMILATION- When an organism incorporates new

material into the body or cell

MRSTRAN nutritionGER

Nutrition - activity by which an organism obtains

materials and energy from its environment and processes them for its own use.

Includes 3 processes:

A. INGESTION =

B. DIGESTION =

C. EGESTION =

taking in food.

breaking down food.

removal of undigested or undigestible food.

There are 2 TYPES OF NUTRITION:

a) AUTOTROPHIC NUTRITION =

- organism can MAKE ORGANIC COMPOUNDS FROM INORGANIC RAW MATERIALS

- or -

- organism can MAKE ITS OWN FOOD

ex: plants, some bacteria

b) HETEROTROPHIC NUTRITION = - organism must OBTAIN FOOD from environment (can’t make its own) or- Organism MUST OBTAIN PRE-FORMED ORGANIC COMPOUNDS (FOOD) FROM THEIR ENVIRONMENTex: animals, fungi, bacteria

MRSTRANG growthER

GROWTH/DEVELOPMENT

- increase cell size and/or the number of cells in an organism.

MRSTRANGE excretionR

EXCRETION

- removal of the waste products PRODUCED BY THE ORGANISM! (metabolic wastes)

**Not the same as egestion!!!

MRSTRANGER reproduction

REPRODUCTION

- production of new individuals.

**this life process is not needed for survival of the individual, but it is needed for the survival of a species.

LIFE PROCESSES/ACTIVITIESLIFE PROCESSES/ACTIVITIES• MM metabolismmetabolism• RR regulationregulation• SS synthesissynthesis• TT transporttransport• RR respirationrespiration• AA assimilationassimilation• NN nutritionnutrition• GG growthgrowth• EE excretionexcretion• RR reproductionreproduction

What is HOMEOSTASISHOMEOSTASIS?

- the MAINTENANCE OF A STABLE INTERNAL ENVIRONMENT…. EVEN WHEN the external environment changes!

- Homeostasis depends on all the life functions working together in coordination to keep the organism stable.