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What similarities do plastids share with mitochondria?
Both contain chlorophyll.
Both contain their own DNA and ribosomes.
Both produce ATPs.
Both are present only in plant cells.
Both contain their own DNA and ribosomes.
Plastids and mitochondria are both semi-autonomous double-membrane-bound organelles that contain their own circular DNA and 70S ribosomes. This unique structure, which allows them to synthesize some of their own proteins, serves as the primary evidence for the endosymbiotic theory.
Plastids and mitochondria are both semi-autonomous double-membrane-bound organelles that contain their own circular DNA and 70S ribosomes. This unique structure, which allows them to synthesize some of their own proteins, serves as the primary evidence for the endosymbiotic theory.
Think of them as the cell's 'power plants'. Mitochondria are like the generator running on fuel (glucose), while chloroplasts are like solar panels capturing sunlight; both supply energy for the factory's operations.
Remember 'DRA' тАФ DNA, Ribosomes, ATP production (the three main features shared by these organelles).
6CO2тАЛ+6H2тАЛO+lightтЖТC6тАЛH12тАЛO6тАЛ+6O2тАЛ тАФ Photosynthesis in chloroplasts
C6тАЛH12тАЛO6тАЛ+6O2тАЛтЖТ6CO2тАЛ+6H2тАЛO+ATP тАФ Aerobic respiration in mitochondria
These organelles function as energy transducers within the cell. Mitochondria facilitate cellular respiration to generate ATP, while plastids (specifically chloroplasts) perform photosynthesis to convert light energy into chemical energy. Both utilize a chemiosmotic gradient across their inner membranes to drive ATP synthase, the enzyme responsible for producing ATP.
Both organelles have a double-membrane system.
Both contain their own circular DNA independent of the nucleus.
Both possess 70S ribosomes for protein synthesis.
Both are involved in energy transduction.
Increased metabolic efficiency for the cell.
Ability to synthesize critical proteins internally.
Production of cellular energy (ATP).
Carbon fixation in plants (photosynthesis).
| Feature | Mitochondria | Plastids |
|---|---|---|
DNA Presence | Present (Circular) | Present (Circular) |
Ribosomes | 70S | 70S |
Endosymbiotic theory suggests these organelles evolved from free-living prokaryotes engulfed by ancestral eukaryotic cells.
The option 'Both contain chlorophyll' is wrong because mitochondria lack chlorophyll.
The option 'Both are present only in plant cells' is wrong because mitochondria are present in nearly all eukaryotic cells, including animal cells.
B is correct тАФ Both mitochondria and plastids contain their own DNA and ribosomes, a hallmark of their semi-autonomous nature.
Always remember that mitochondria are the 'powerhouse of the cell' for both plants and animals, whereas plastids are exclusive to plants and algae.
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