Dr. Hincapie recognized that the two larger pieces of DNA— 2100 base pairs and 1800 base pairs—were from plasmids found in bacte
ria that cause infections. The brightness of a piece of DNA on a gel reveals two things: larger pieces of DNA are brighter than smaller pieces and larger amounts of DNA appear brighter than smaller amounts. Knowing this, which bands on this gel do you think contain a gene for resistance to: Antibiotic A: _____
Antibiotic B: _____
Antibiotic C: _____
Antibiotic D: _____
Answer: He didn’t grow a plant without fertilizer.
Explanation: Manu has nothing to compare his plant to. Meaning, he cannot prove that fertilizers help plants grow. He needs to grow a plant with and without fertilizer.