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Answer:
Peptide hormones in the bloodstream are always bound to carrier proteins.
Explanation:
Peptide hormones are also called protein hormones owing to the fact that they are produced from amino acid chains, which are different from their counterparts made of lipids i.e. steroid hormones. Peptide hormones are first synthesized as preprohormones which undergoes series of processing to form the PROHORMONE.
The prohormone undergoes further modifications in the Golgi complex and transported via vesicles to be released as mature hormones via exocytosis. Like every proteinous molecule, peptide hormones translated on ribosomes attached to the endoplasmic reticulum i.e. RER.
However, peptide hormones are hydrophilic in nature and hence will dissolve and move easily in aqueous environment without the need of carrier proteins. Carrier proteins are needed for water-fearing (hydrophobic) molecules.
There are different properties of peptide hormones. The false statement is that Peptide hormones in the bloodstream are always bound to carrier proteins.
- Peptide hormones are known to be water-soluble and, cannot readily cross hydrophobic cell membranes. A lot of peptide hormones use force of actions by attaching themselves to specific receptors found on the surface of target cells.
They are usually short or long ( proteins ) chains of amino acids that are water-soluble but cannot pass through the plasma membrane by themselves alone.
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