Which of the following statement(s) is/are true concerning carrier proteins?
A.	Carrier proteins are distinguished by three types of mechanisms: carrier-type, channel-type, and conduction-type
B.	Conformational changes in the membrane protein occur between the conducting and the nonconducting states
C.	A channel-type carrier protein has two states—closed and open
D.	Carrier-type transport proteins are equally accessible from either side of the membrane
Answer:B
Which of the following statement(s) is/are true concerning carrier proteins?
A.	Carrier proteins are distinguished by three types of mechanisms: carrier-type, channel-type, and conduction-type B.	Conformational changes in the membrane protein occur between the conducting and the nonconducting states C.	A channel-type carrier protein has two states—closed and open D.	Carrier-type transport proteins are equally accessible from either side of the membrane