Soluble proteins are proteins that can dissolve in water.
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The solubility of proteins in water is determined by their structure and amino acid composition. Proteins with a high proportion of hydrophilic amino acids (such as charged and polar amino acids) tend to be water soluble. Conversely, proteins with a high proportion of hydrophobic amino acids (such as nonpolar amino acids) tend to be insoluble in water. Additionally, the presence of strong intra- or intermolecular forces (such as disulfide bonds) can also contribute to protein insolubility in water.
Hydrophobic amino acids on lipid bi-layer
Some hydrophobic substances are soluble in water (ex.: proteins).
Steroids are lipids. Lipids are organic soluble, instead of water soluble. Their basic structure is that of the steroid ring: four linked rings of carbon.
No the soluble proteins can not pass though the transporters on the membrane. Transport proteins are highly specific they only allow the transport of ions such as Na or K across the cell. But transport proteins such as Hemoglobin can carry oxygen or CO2 to all the tissues for respiration.
In general, proteins are water soluble. We have several proteins circulating in our blood. By the way, there's one type of proteins which is made for carrying cholesterol and tryglicerides (that obviously are fat soluble) through the circulation.
no
Albumin and globulin are simple soluble proteins.
NO. Think of muscles as polypeptides, if they were soluble, then we would be a like a bag of bones in blood.
lipids
Yes they are
Protein synthesis on ribosomes attached to ER membrane: secreted proteins integral membrane proteins soluble proteins destined for life in a membrane bound compartment
The solubility of proteins in water is determined by their structure and amino acid composition. Proteins with a high proportion of hydrophilic amino acids (such as charged and polar amino acids) tend to be water soluble. Conversely, proteins with a high proportion of hydrophobic amino acids (such as nonpolar amino acids) tend to be insoluble in water. Additionally, the presence of strong intra- or intermolecular forces (such as disulfide bonds) can also contribute to protein insolubility in water.
Proteins are absorbed primarily as amino acids. These acids are water soluble and easily absorbed by the body via active transport.
Some hydrophobic substances are soluble in water (ex.: proteins).
Hydrophobic amino acids on lipid bi-layer
Thyroxine (T4) and triiodothyroxine (T3) are both lipid soluble. In order to travel through the blood they must bind to plasma proteins.