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MDCAT
Biology
2025

Biology · Biological Molecules

Work through this past-paper style MCQ, then read the full explanation. Practice more biology questions on mMCQ with adaptive practice and topic analytics.

Question

Glycoproteins are formed as a result of the combination of:

Options
  • A

    Lipids and proteins

  • B

    Carbohydrates and proteins

  • C

    Nucleic acid and proteins

  • D

    Fatty acids and carbohydrates

Explanation

Glycoproteins are biomolecules formed from the combination of carbohydrates and proteins through a process called glycosylation. They are crucial for various biological functions, including cell-cell recognition, signaling, and immune responses. The correct answer is Option B, as it directly identifies the two components involved in the formation of glycoproteins.

Option A is incorrect because lipids are not a part of glycoprotein structure. Option C involves nucleic acids, which have distinct roles in genetic information storage and transmission, not glycoprotein formation. Option D is also incorrect as it suggests a combination that does not occur in glycoprotein synthesis.

While lipids can form complexes with proteins (lipoproteins), glycoproteins specifically involve carbohydrates, not lipids.

This is the correct answer. Glycoproteins are formed by the covalent bonding of carbohydrates to proteins, playing crucial roles in cellular functions.

Nucleic acids (DNA and RNA) do not combine with proteins to form glycoproteins; instead, they serve different functions within the cell.

Fatty acids are components of lipids and do not form glycoproteins, which specifically involve carbohydrates and proteins.

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Tagged under Biology · Biological Molecules · 2025