Which of the following is true?
a.
cells from different organs have nothing in common.
b.
cells from different organisms have nothing in common.
c.
every cell is exactly the same.
d.
cells from different organs may have similar structures.

The correct answer is: D.  Cells from different organs may have similar structures.

Explanation:

Every cell in an organism has something in common: its genetic information. Genetic information, in form of DNA, is stored in the nucleus of every cell.

According to the needs of every specific cell, different segments of the DNA are used to synthesize proteins that are useful for that cell. For example, a hepatocyte (cell in the liver) does not have the same proteins as a neuron (nervous cell) because their functions are hugely different, BUT they do share the same genetic information.

after a the power stroke, adp is released, but the cross-bridge formed is still in place. atp then binds to myosin, moving the myosin to its high-energy state, releasing the myosin head from the actin active site.