Biology 9700/23 — May/June 2021
Cambridge AS Level · AS Level Structured Questions · worked solutions for every part, with the mark scheme
Topics Cell Structure · Biological Molecules · Cell Membranes and Transport · Infectious Diseases · Immunity · Nucleic Acids and Protein Synthesis · +5 more
The Golgi body, rough endoplasmic reticulum (RER) and smooth endoplasmic reticulum (SER) form part of the internal membrane system of a cell. The membranes have a fluid mosaic structure.
Fig. 1.1 is a transmission electron micrograph of one area of a liver cell showing a region with RER and a region with SER. Mitochondria are also visible in the image.
Describe the differences in structure and function between RER and SER.
Phospholipids are one of the main components of membranes.
Describe the structure of a phospholipid molecule.
One function of a Golgi body is to package molecules into Golgi vesicles.
A Golgi body and Golgi vesicles are not visible in Fig. 1.1.
Describe the features, other than the presence of Golgi vesicles, that would help you identify a Golgi body in a transmission electron micrograph of another area of the same liver cell.
Some Golgi vesicles contain secretory proteins for release from the cell.
Describe the sequence of events that occurs following the packaging of a secretory protein into a Golgi vesicle to its release from the cell.
Some Golgi vesicles contain glycoproteins or glycolipids to be added to the cell surface membrane.
Outline the role of glycolipids in the cell surface membrane.
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