a-The protein Ras is involved in 25% of all cancers, and is attached to membrane

Question

a-The protein Ras is involved in 25% of all cancers, and is attached to membranes through a covalent bond to a phospholipid. Which of the following best describes how Ras is associated with a membrane?
1. Through a transmembrane domain
2. Through an anchor
3. As a pore
4. As a loose association with the surface of lipids.

b-The hormone insulin is a protein produced in the pancreas and then secreted into the blood stream after a meal to increase glucose uptake by tissues. Which of the following mechanisms would be used to secrete insulin from the pancreas?
1. active transport
2. facilitated diffusion
3. diffusion
4. endocytosis
5. exocytosis

Explanation / Answer

a) 2. Through an anchor (like a lipid anchor, and prenylation) b) 1. active transport

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