Matt Wilcock just renewed his gym membership for the coming year and feels this is one of his best investments. You see, he works out regularly because he wants to look more muscular. Despite the reality that his friends tell him he looks great, Matt believes he looks skinny and that his friends are making fun of him behind his back. He continues to exercise excessively in order to increase his muscle mass and recently started taking anabolic steroids. Matt does not think any of this is working and he remains dissatisfied with his appearance. When his friends try to reassure him that he looks fine, Matt believes, "I just need to work harder at pumping up." What is the most likely diagnosis for Matt?

Rease is an enzyme used by plants to break down urea (a nitrogen-containing compound) into carbon dioxide and ammonia. urease urea > > > carbon dioxide and ammonia ammonia is broken down by plants into a nitrogen source plants need to grow. thus, plants could not use urea as a nitrogen source unless it was first converted to ammonia. in soybean plants there are two different kinds of urease, one produced in the seeds and the other produced in the leaves of the plant. three types of soybean plants were used in a set of experiments: normal soybeans and two mutant strains, one lacking the urease in the seeds only (strain 1) and one lacking urease in the leaves only (strain 2). experiment 1 separate areas in a field were planted with normal, strain 1, and strain 2 soybeans. all types of soybeans appeared to grow, flower, and produce seeds equally well. there were no externally detectable differences among the strains. experiment 2 small pieces of plant leaves of equal weight were obtained from each type of soybean plant and separately placed on media in culture dishes. tissue growing in this way will become an unorganized clump of cells referred to as callus. to provide a controlled nitrogen source, half the tissue samples of each type were placed on media containing urea, and the other half of the samples were placed on media containing ammonia. after 30 days, the weight gain for each of the callus samples was determined. results are shown in the table below.