Life, Cells, and Organelles

What is it like inside a cell?

• http://www.studiodaily.com/2006/07/cellular-visions-the-inner-life-of-a-cell/

KWL

• What do you know about cells?

• What do you want to know?

• What questions do you have about cells?

What does it mean to be living

• What are the seven characteristics of life?

• 1

• 2

• 3

• 4

• 5

• 6

Movement

• All living organisms move, even plants!

Reproduction

• All living organisms need to reproduce to pass on their genes to future generations

• Keeps the species going

• Humans, like other animals produce babies, while some microbes reproduce asexually, by splitting in two!

Sensitivity to Environment

• Why is there a need to be sensitive to the environment?

• Awareness of surroundings

• Helps organisms keep from danger

• Search for food

Growth

• All living organisms grow to get bigger!

Respiration

• All organisms have a need to exchange gas with their environments

• How are plants and animals different in their respiration?

Excretion

• We all make waste...even you!

• When we breathe, we are releasing CO2.

• Other examples...?

• Why is there a need to do this?

Nutrition

• Animals consume living things to get food

• Plants make their own through photosynthesis

• They use the sun and simple chemicals to produce sugar

MRS GREN

• MOVEMENT

• RESPIRATION

• SENSITIVITY TO ENVIRONMENT

• GROWTH

• REPRODUCTION

• EXCRETION

• NUTRITION

Spontaneous Generation

• Many things today are taken for granted

• Many tests and experiments have been performed to change prior conclusions

• We didn’t always have the scientific method

Observation

•Every year in the spring, the Nile River flooded areas of Egypt along the river, leaving behind nutrient-rich mud that enabled the people to grow that year’s crop of food. However, along with the muddy soil, large numbers of frogs appeared that weren’t around in drier times.

•Conclusion: It was perfectly obvious to people back then that muddy soil gave rise to the frogs.

Observation•In many parts of Europe, medieval farmers

stored grain in barns with thatched roofs (like Shakespeare’s house). As a roof aged, it was not uncommon for it to start leaking. This could lead to spoiled or moldy grain, and of course there were lots of mice around.

•Conclusion: It was obvious to them that the mice came from the moldy grain.

Where does life originate

•Where do cells come from?

Francesco Redi, 1668

BRAIN POP

• http://www.brainpop.com/science/cellularlifeandgenetics/cells/

Cells

• Robert Hooke 1665

• The first person to see cells, he was looking at cork and noted that he saw “a great many boxes”

• Anton van Leeuwenhock 1673

• Observed living cells in pond water, which he called “animalcules”

Cells cont’d• Theodore Schwann 1839

• Zoologist who observed that the tissues of animals had cells

• Mattias Schleiden 1845

• Botonist, observed that tissues of plants contained cells

• Rudolf Virchow 1850

• Reported that every living thing is made up of vital units, known as cells. He also predicted that cells come from other cells

THe cell theoryTHEORY- A WELL TESTED CONCEPT BASED ON A WIDE RANGE OF

OBSERVATIONS.

• 1. every living organism is made of one or more cells

• 2. The cell is the basic unit of structure and function. it is the smallest unit that can perform life functions

• 3. Alls cells arise from pre-existing cells

• How might this theory change?

Snake names• Mr. Maize

• Jeremiah

• Hawk Eye

• Gutta

• Taco

• Raga

• Gator

• Tyga

• Kato

• Chad

• Chester

• Spike

• Mr. Jones

• Davey Jones

Organelles

• What word does it look like?

• What do they do?

• How might they be similar?

What does a cell look like?

• Draw a picture of a cell.

• What does it look like?