D Question 3 2 pts Boulder The protein Ras is involved in 25% of all cancers, an

Question

D Question 3 2 pts Boulder 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? O Through a transmembrane domain. O Through an anchor. O As a pore. O As a loose association with the surface of Courses Calendar lipids. Inbox Help DQuestion 4 2 pts 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? O Active transport O Facilitated diffusion Diffusion O Exocytosis

Explanation / Answer

Question 3

Ras acts as a signal transducer and hence is associated through its transmembrane domain with membrane.

Question 4

Insulin secretion from pancreas occur with the help of ATP sensitive potassium channels where influx of Ca+ causes fusion of insulin vesicles with cell membrane. In order to increase insulin secretion in bloodstream, exocytosis of insulin vesicles from pancrease would be more.

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