Ion channels and cellular transport structures belong to this classification of

Transporters

Explanation:

All proteins interacting with the cell membrane are called membrane proteins. A subclass of such proteins are the transporters which are involved in the transport of different kind of substances inside or outside the cell. This substances can be ions or macromolecules depending on the portein structure.

1. (1.2kw)x(15/60hours) = .3kwh --> a

2. (5kw)x(90/60hours)x(8cents/kwh) = $0.60 --> d

3. microwave --> 1200 watts = (1.2kw)x(6/60hours) = .12kwh

coffee-maker --> 900 watts = (.9kw)x(10/60hours) = .15kwh

therefore, it requires more energy for the coffee-maker to do the same amount of work.

so the answer is a.

b is the correct answer