False
Not always, some proteins are used in a variety. <span>Protein channels are needed to transport substances because it accelerates the transport process. Very few substances enter or leave cells without being attached to a transport protein. Different types of substances require different types of proteins to transport them. Protein channels transport water or ions downwards and ATP-powered pumps transport molecules or ions upwards. ATP generates energy to transport the molecules upwards. </span>
Answer:
B and D? or the second and fourth ones
Explanation:
29.7%, which can be rounded to 30%
Answer:
molecule
Explanation:
because water aka h20 is a molecule
