Psychiatrists are testing the effectiveness of a proposed ADHD medicine. They recruit parents who are willing to allow their child to be a part of the
clinical tests. All of the children are between the ages of 9 and 14 and
have been diagnosed with ADHD. Group A has the new medication that
is being tested while children in Group B are given a sugar pill. In this
scenario, Group B represents the

answer; ///i believe the correct answer is (aids) acquired immune deficiency syndrome;

many other transport proteins, often called pumps, move materials against a concentration gradient. active transport drives molecules across a membrane from a region of lower concentration to a region of higher concentration. this process, shown in figure 5.1, uses transport proteins powered by chemi- cal energy.