What is a characteristic feature of a carrier protein in a plasma membrane?

It exhibits specificity for a particular type of molecule .

Explanation:

Carrier proteins are a kind of transmembrane protein which helps in the transport of molecules across the cell membrane. Carrier proteins specifically binds to a particular and specific type of molecules and helps in their transportation.  

If they transport the molecules without the expenditure of energy then it is considered as facilitating diffusion and when they use ATP for transport it is called active transport.  

Inactive transport, molecules are moved against their concentration gradient and in facilitated diffusion, molecules are moved along their concentration gradient.

ecological efficiency: % of usable energy transferred as

biomass from one trophic level to the next typical is 10% efficient (90% of

energy is lost),is diagramed as the pyramid of energy flow. then osprey eagle

are tertiary consumer and the shrimp are primary consumer, so to balance

mass of shrimp (1/0.1) / 0.1 = 100 kg