mwest200316
24.07.2019 •
Biology
The contraction cycle is triggered by the rise in released from the sarcoplasmic reticulum (sr).
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Ответ:
A. Ca2+
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Ответ:
A
Explanation:
B) not all cells have a nucleus. For example, prokaryotes have no nucleus
C)Not all cells have a cell wall.(Animal cells don't)
D) not all cells have mitochondria (Prokaryotes don't)
A) all cells contain DNA, and DNA is all composed of adenine, thymine, guanine, and cytosine.