4.1. Fluid mosaic membranes
A subsection of Biology, 9700, through 4. Cell membranes and transport
Listing 10 of 134 questions
Cholesterol is synthesised in the smooth endoplasmic reticulum (SER) in liver cells by a series of enzyme-catalysed reactions. Within the SER, molecules of cholesterol and triglycerides are surrounded by proteins and phospholipids to form lipoproteins. These lipoprotein particles enter the Golgi apparatus where they are packaged into vesicles and pass to the blood. is an electron micrograph of part of a liver cell showing lipoprotein particles within the Golgi apparatus. lipoprotein particle T membrane- bound duct Name structure T in and state its role in liver cells. Suggest why cholesterol is packaged into lipoproteins before release from liver cells into the blood. Explain why cells of the body need to be supplied with cholesterol. Cholesterol is also packaged into vesicles by the SER and then secreted from the cell into small fluid-filled spaces between the liver cells. These spaces form ducts that drain into the gall bladder to form bile. Suggest how cholesterol is secreted into ducts, such as the duct in . State one function of the Golgi apparatus other than the packaging of substances into vesicles for transport.
9700_w13_qp_21
THEORY
2013
Paper 2, Variant 1
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Questions Discovered
134