Reinforcement 1 Science 6

Reinforcement 1 Science 6

Open Ended

What is life?

The begining of the life

Even the creation of the earth keeps being a mistery, there are seevral facts that support the idea that the big bang is such a strong theory.

However there is another question that has been around humanity since its beginning, an is about the origin of life.

Spontaneous generation theory

Aristotle proposed that life arose from nonliving material if the material contained pneuma (“vital heat”). As evidence, he noted several situations in which there was the appearance of animals from environments where previously there weren't.

Francesco Redi contribution

In 1668, he published his experiments showing that maggots were not the product of decay, but rather the offspring of flies that laid their eggs in the meat.

“all life comes from life”,

Poll

Is spontaneous generation of life possible?

• YES

• NO

With the improve of the microscope, Antony van leeuwenhook discovered an invisible world, and later with his contributions the cell theory was proposed

Multiple Select

Which of the following are made of cells?

• Plants

• Mushrooms

• Bacteria

• Soil

• sunlight

Multiple Select

Organs are the combination of tissues, and tissues the combination of cells.

which of the following are organs?

• leaves

• kidneys

• legs

• fur

• flower

Open Ended

What was the origin of all your cells?

Chemical evolution

Describe the hypothesis that organic building blocks of life were created when inorganic molecules came together.

Stanley Miller's contributions

he performed an experiment that may explain what occurred on primitive Earth billions of years ago. He sent an electrical charge through a flask of a chemical solution of methane, ammonia, hydrogen and water. This created organic compounds including amino acids.

Open Ended

What is the conclusion from the stanley Miller's experiment?

Endosymbiotic theory

-Explain the origin of eukaryotic cells

-Some prokaryotic cells evolved and acquire the ability to phagocytize, or eat, other cells. In some cells, the bacteria that were ingested were not eaten, but utilized.

-Mitochondria formed when bacteria capable of aerobic respiration were ingested

-Chloroplasts formed when photosynthetic bacteria were ingested.