Endosymbiosis Ted Ed

Until about 2 billion years ago, the only life on Earth were _____ simple celled organisms that lacked membrane bound organelles.

• prokaryotes
• animals
• plants
• fungi

The process of cells living together, specifically one organism living inside another, is called

• endosymbiosis

• trespassing

• exosymbiosis

Which two prokaryotic cells found their way into the “Blob” cell and survived in the video?

• A. Mitochondria

  and Chloroplasts

• B. Ribosomes

  and Viruses

• Both A and B are correct

What is the current, best theory about how complex cells evolved?

• The theory of intelligent design.
• The endosymbiotic theory.
• The theory of spontaneous generation.
• The RNA world hypothesis.

What evidence do scientists have for the Endosymbiosis Theory?

Check all that apply

• The chloroplasts and mitochondria in eukaryotic cells multiply the very same way as those ancient bacteria,

  which are still around, by the way.

• Mitochondria and Chloroplasts have their own DNA and Ribosomes. Their DNA has a circular structure that is strikingly similar to the DNA of the ancient bacteria, and it also contains many similar genes.

• Chloroplasts and mitochondria both have two membranes surrounding them,

  an inner and outer membrane.

  The outer one similar to the Blob that eat them, and an inner one similar to their bacterial ancestors.