The correct answer is b. Glad to have helped
        
             
        
        
        
The Simple cuboidal epithelium<span> forms thyroid gland and secretes hormones is shown in the picture attached.
</span><span>Its main functions are secretion and absorption. It has an abundance of organelles to facilitate active transport frequently found in glands, such as salivary glands, the thyroid gland, and the pancreas, where its function is secretion. 
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The epithelial<span> cells tend to be </span>cubical<span> in </span>form after they are inactive, however additional <span>columnar </span>after they are<span> actively secreting hormones. 
The </span>epithelial<span> cells accumulate iodine from the blood and use this </span>component within the<span> synthesis of thyrog</span>lobulin<span>, </span>an oversized compound protein that<span> forms the </span>mixture<span>.</span>
 
        
             
        
        
        
A protein domain is a conserved part of a given protein sequence and (tertiary) structure that can evolve, function, and exist independently of the rest of the protein chain. Each domain<span> forms a compact three-dimensional structure and often can be independently stable and folded.
On the other hand, a motif is a </span>distinctive sequence<span> on a protein or DNA, having a three-dimensional structure that allows binding interactions to occur. Early on, clustering was used to detect common three-dimensional structural motifs in </span>proteins<span>.
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