Multiple choice

It is a hypothesis that mitochondria evolved from endosymbiotic bacteria. Therefore, mitochondria are similar to bacteria in many ways. Which of the following is NOT a similarity between mitochondria and bacteria?

  1. Both have circular, double stranded DNA.

  2. Both have 70S ribosomes.

  3. Both are about the same size.

  4. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Both have 70S ribosomes. Ribosomes are cellular organelles that take part in protein synthesis. They are made up of two sub units: small and large. Bacteria have 70S ribosomes. Their small subunit is called 30S and the large one is called 50S. Mitochondria have 55S ribosome: 30S and 40S.

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