In an experiment of the effect of fertilizer on tomato plant growth, Rick decides to apply the fertilizer to only some of the plants and use the rest as controls to compare. He applies fertilizer to the 2 smallest plants. When he measures their growth at the end of the week, he finds the plants treated with fertilizer haven’t grown as much as the untreated plants. What is the biggest mistake Rick made with his experiment?

When red blood cells are kept in a HYPOTONIC solution, the cells

In this picture, dialysis tubing is acting as the cell membrane of a model cell.  The tubing was filled with starch solution and placed in a beaker containing an iodine solution. THIS PICTURE demonstrates which property of the cell membrane?

One of the keys to discovering how DNA is replicated was the use of cesium chloride gradients coupled with the use of either heavy or light ______.

Which of the following items SHOULD NOT be disposed of in the receptacle shown in the image below? (Select all that apply).

Elodea cells were placed in solutions that were either isotonic, hypertonic, or hypotonic (relative to the Elodea cell contents). You mixed up your labels, but know that one of each solution was used in your experiment.  (Hint: plants have central vacuoles). Given the appearance of the cells in image A, the SOLUTION must be ___________________ compared to the Elodea cells.

The data shows the results from a test cross in peas. Green coloration (G) is dominant over yellow coloration (g), and smooth texture (S) is dominant over wrinkled texture (s). Based upon the information given, what would have been the genotype of the unknown individual?

During gel electrophoresis, which direction do DNA fragments travel toward?

What is the total magnification of this dissecting microscope?

This graph shows 3 enzyme reactions in which the only difference was the temperature conditions. What can you conclude from the graph?