Endosymbiotic theory

What is the primary characteristic of a scientific theory?

• It is an educated guess that has not yet been tested.

• It is a widely accepted explanation supported by extensive scientific evidence.

• It is a personal belief about how something works.

• It is a hypothesis that has been disproven.

What does the Endosymbiotic Theory explain?

• How prokaryotic cells developed a cell wall.

• How eukaryotic cells evolved from prokaryotic cells.

• How cells reproduce through binary fission.

• How organisms develop resistance to antibiotics.

Which of the following features is present in eukaryotic cells but NOT in prokaryotic cells?

• Cell membrane

• Cytoplasm

• Nucleus

• Ribosomes

What evidence supports the idea that mitochondria and chloroplasts were once independent prokaryotic organisms?

• They are much larger than typical eukaryotic cells.

• They contain their own DNA, separate from the cell's nucleus, and divide independently.

• They are only found in animal cells.

• They lack a cell membrane.