Question

question 5 10 pts what evidence supports the endosymbiotic theory?
○ mitochondria cannot divide independently
○ organelles are the same size as modern eukaryotic cells
○ chloroplasts have the same dna as the nucleus
○ mitochondria and chloroplasts have their own dna arranged similar to bacterial dna
question 6 10 pts which type of eukaryotic cells contain both mitochondria and chloroplasts?
○ cells that can perform photosymnthesis
○ only animal cells
○ only prokaryotic cells
○ all eukaryotic cells

Explanation:

Question 5

The endosymbiotic theory proposes that mitochondria and chloroplasts were once free - living prokaryotes. Mitochondria can divide independently, so the first option is wrong. Organelles are much smaller than modern eukaryotic cells, so the second option is wrong. Chloroplasts have their own distinct DNA different from the nuclear DNA, so the third option is wrong. Mitochondria and chloroplasts having their own DNA arranged similar to bacterial DNA (circular, not linear like nuclear DNA in eukaryotes) is strong evidence for the endosymbiotic theory.

Animal cells do not have chloroplasts, so the "only animal cells" option is wrong. Prokaryotic cells are not eukaryotic, so the "Only prokaryotic cells" option is wrong. Not all eukaryotic cells have chloroplasts (e.g., animal cells, fungal cells), so the "All eukaryotic cells" option is wrong. Cells that can perform photosynthesis (like plant cells and some protists) need chloroplasts for photosynthesis and mitochondria for cellular respiration, so they contain both.

Answer:

D. Mitochondria and chloroplasts have their own DNA arranged similar to bacterial DNA

Question 6