## Core Concept
Glycoproteins are proteins that have carbohydrate chains (glycans) covalently attached to their polypeptide side-chains. These molecules play critical roles in various biological processes, including cell-cell recognition, signaling, and as receptors or ligands in numerous physiological and pathological events. The addition of carbohydrate moieties to proteins can significantly affect their stability, folding, and interactions.

## Why the Correct Answer is Right
The correct answer relates to the characteristics and functions of glycoproteins. Typically, glycoproteins are involved in cell-cell interactions, serve as receptors, and have roles in immune responses and signaling. They are synthesized in the endoplasmic reticulum and Golgi apparatus, where the carbohydrate molecules are attached to the protein. This process, called glycosylation, can affect the protein's function, stability, and cellular localization.

## Why Each Wrong Option is Incorrect
- **Option A:** This option is not provided, but generally, any statement about glycoproteins being involved in cell-cell recognition, acting as receptors, or being synthesized in the ER and Golgi would be true.
- **Option B:** Similarly, without the specific content of Option B, we can't directly address its inaccuracies, but statements about glycoproteins having a wide range of functions or being critical in disease processes would typically be accurate.
- **Option C:** This option is also not provided, but if it suggested that glycoproteins are only found on cell surfaces, this would be incorrect because glycoproteins can also be secreted or found in various organelles.
- **Option D:** Without specific details, if Option D made a statement that glycoproteins do not have roles in immune responses or inflammation, this would be incorrect as many glycoproteins are indeed involved in these processes.

## Clinical Pearl / High-Yield Fact
A key point to remember is that **glycoproteins are crucial in the immune system**, serving as antibodies (immunoglobulins), cytokines, and receptors on immune cells, which facilitate the recognition and response to pathogens. Their carbohydrate moieties can also serve as ligands for lectins on the surface of immune cells, influencing immune responses.

## Correct Answer: D.