Researchers have found that mitochondria and chloroplasts in eukaryotic cells have their own DNA. This DNA Is differento n the DNA In a eukaryotic cell's nuceus. Chloroplasts and mitochondria use their own DNA and ribosomes to make some organelle-speci roteins.
What statement is best supported by this information?
OA
Modern cells could exist without mitochondria and chloroplasts.
B. Mitochondria and chloroplasts cuuld exist outside of modern cells.
OC Early eukaryotic cells engulfed p. okaryotic cells, which later became mitochondria and chloroplasts.
OD. Early prokaryotic cells engulfed eukaryotic cells, which later became mitochondria and chloroplasts.
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im back lol i heard you where asking for me

you're crazy : )

the answer is: the „power stroke“ step.

muscle contraction can be divided into a few steps:

1. the release of ach (acetylcholine) in the synaptic cleft, binding of ach for its receptor and consequently opening of the ca channels.

2. the release of ca, binding of ca for the troponin

3. troponin shifting the tropomyosin, which was blocking the active site on the actin

4. myosin heads attaching to actin by breaking down atp to adp+ pi

5.   formation of the ‘cross-bridge’ on the active site of the actin filament by myosin head

6. “power stroke” -the cross bridge pulls actin, which slides over the myosin

9.     7. the release of adp completes the cross-bridge movement and atp attaches to myosin, breaking the actin-myosin cross bridge.