Why do myosin filaments have club-shaped heads?
the heads are where acetylcholine binds to initiate contraction.
the heads bind calcium to initiate contraction.
the heads pull on the z discs during contraction.
the heads attach to and pull actin filaments during contraction.

What is the answer for the complicated molecules that make up living things usually contain carbon. why is carbon so important in these molecules?

Asap. this question is 100 points if you answer it question: describe the basic relationship between ocean depth and temperature seen in the graph

The empty trna moves off and picks up another matching amino acid from the cytoplasm in the cell. the anticodon of the trna, with its attached amino acid, pairs to the codon of the mrna, which is attached to a ribosome. this sequence is repeated until the ribosome reaches a stop codon on the mrna, which signals the end of protein synthesis. the ribosome forms a peptide bond between the amino acids, and an amino acid chain begins to form. when a second trna with its specific amino acid pairs to the next codon in sequence, the attached amino acid breaks from the first trna and is bonded to the amino acid of the second trna.