PLEASE HELP
Which most effectively describes the relationship between carrier and channel proteins? (Select all that apply.)
A. Carrier proteins are active transport mechanisms, but channel proteins can be either active or passive.
B. Channel proteins are active transport mechanisms, but carrier proteins can be either active or passive.
C. Carrier proteins are passive transport mechanisms, but channel proteins can be either active or passive.
D. Channel proteins are passive transport mechanisms, but carrier proteins can be either active or passive.