Structure X represents a molecule of - phospholipid - VCE - SSCE Biology - Question 6 - 2014 - Paper 1

To determine what Structure X is, we need to consider the characteristics of each option:

1. Phospholipid:

   • Composed of a glycerol backbone, two fatty acids, and a phosphate group.
   • Important for cell membranes.

2. Glycoprotein:

   • A protein with carbohydrate chains attached.
   • Functions in cell recognition and signaling.

3. Carbohydrate:

   • Organic compounds made of carbon, hydrogen, and oxygen.
   • Commonly involved in energy storage.

4. Cholesterol:

   • A type of sterol involved in membrane structure.
   • Precursor for steroid hormones.

Based on the structure's features, the most likely candidate is a phospholipid (option A) since it plays a vital role in forming cell membranes.