biol

Question 1

Adaptive radiations

Answer 1

The rapid diversification of a single lineage into a larger number of species, each with adaptations that allow them to exploit different resources and habitats

Question 2

Which organelles contain DNA that is structurally similar to bacterial DNA?

Answer 2

Mitochondria and chloroplasts

Question 3

The origin of organelles in eukaryotic cells can be explained by the endosymbiosis theory. This theory states that organelles such as mitochondria and chloroplasts were once free-living prokaryotic cells that were ingested by another prokaryotic cell. Over time, these internalized cells became part of what we now know as eukaryotic cells. Which observations support this theory?

Answer 3

1. Mitochondria and chloroplasts allow for specialized chemical reactions that increase metabolic efficiency for eukaryotic cells.
2. Mitochondria and chloroplasts are only found in eukaryotic cells.
3. Mitochondria and chloroplasts have circular DNA as well as their own ribosomes.