The ends of the actin filaments are anchored to the Z-line or disk.
The sarcomere is the primary functional unit of muscle fiber. It is flanked by a Z-band on each end with adjoining I-bands. The Z-band or disk is a dense fibrous structure composed of actin, α-actinin as well as other proteins.
Thin filaments or actin filaments are anchored at one end at the Z-band. Titin is connected to both the Z-band and the M-line. Thick filaments are attached in the middle of the sarcomere at the M-line.
An intermediary filament protein forms a meshwork from one Z-disk to the next across the myofibril. These networks are joined by actin through the protein dystrophin to the sarcolemma.
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I say its B. This is because ribosomes are proteins. RNA is creates a sysntesis of proteins by the help of a ribosomes. So ribesomes helps create proteins in our bodies.
The +1 site is the transcription start site and the region 10 base pairs upstream is a region of the promoter critical for sigma binding and initiation. Initiation will be inhibited because sigma cannot bind to the promoter. Mutations are random, sudden spontaneous changes that occur in the genetic make up of an organism.
I think no embryo inside the water
It's probably too late......
Specialized cells work independently as well as in a team to perform the functions of the body.