The origin of a skeletal muscle is
a. attached to the less mobile portion of the skeleton.
b. attached to the portion of the skeleton that moves when the muscle contracts.
c. never attached to the skeleton.
d. its belly.
c
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Which of the following statements is not true of nitrogen-fixing bacteria?
A. They live in root nodules. B. They are very common in symbioses with plants from the legume family. C. They are very common in symbioses in all plant families. D. Some are free-living in the soil. E. They provide an important way that biologically available nitrogen enters ecosystems.
Which eukaryotic organelles likely arose from symbiotic relationships between larger cells and bacteria?
a. nuclei b. endoplasmic reticulums c. vacuoles and chloroplasts d. mitochondria and chloroplasts e. mitochondria and Golgi complexes
Where does mechanical digestion begin?
What will be an ideal response?
DNA helicase is involved in "rewinding" the strands of DNA back into a helix after replication
Indicate whether the statement is true or false