Which of these statements is true regarding ligands? A) Ligands are always a protein. B) Each individual ligand is only able to bind to one specific receptor. C) The binding of a ligand to a receptor molecule causes the receptor to change shape. D) Ligands can pass through the plasma membrane, but must bind to receptors in the nucleus or cytoplasm.

hey bro i looked it up on google the structure of the eye-spot in euglena viridie, e. ehrenbergii, and phacus pyriyorme is not as franzé haa described it. the so-called “crystal body” and “lens bodies” were not found in any of the individuals of the species examined by me. as earlier observers have stated, the eye-spot consists simply of a mass of pigment granules arranged in a single layer, and probably embedded in a protoplasmic framework, but the latter could not be seen, and its presence was only inferred from the fact that the pigment granules must be held together in some way, thd the eye-spot as a whole is capable of expansion, and that the pigment granules can be separated from each other.

hope this   and an i get brainlsiest

a = executive branch; b = judicial branch