Most of the cellular secretions are ________ in nature?
Correct answer: B. Glycoproteins
- A. Glycolipids
- B. Glycoproteins
- C. Nucleohistones
- D. Proteins
Explanation
Many cellular secretions are glycoproteins, in which carbohydrate groups are attached to protein molecules; examples include several hormones, enzymes, antibodies and mucus components. Nucleohistones are nuclear DNA-protein complexes and are not typical secretions. Students may choose proteins because many secretions are protein-based, but the question is emphasizing the carbohydrate-protein conjugate.
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About Conjugated Molecules
Conjugated molecules contain a non-protein component attached to a protein portion, giving the molecule properties that a simple protein lacks. The content includes glycoproteins, lipoproteins, phosphoproteins, nucleoproteins, chromoproteins and metalloproteins, with attention to their prosthetic groups and roles in transport, protection, catalysis and cellular structure.
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