The alpha and beta-gamma subunits both can bind to target proteins. Once a G protein becomes active, its alpha subunit and beta-gamma dimer both have the ability to pass on messages in the cell via connecting or binding with other membrane proteins that are involved in the transduction of signals. In this light, B is the best option.
Rationale: A
sweet potato is equivalent to a serving of bread. One cup of skim or nonfat
milk is a serving of milk. A slice of avocado is equivalent to a serving of
fat. One teaspoon of mayonnaise is equivalent to a serving of fat.
