MCAT Question of the Day
    •

    Q:

    		 Ergosterol is a steroid compound found in fungi which serves a similar function to cholesterol in animal cells. Ergosterol is also often detected in samples of various grasses. Which of the following experiments would best identify whether ergosterol is produced by the plants or is a contaminant in the plant samples?
    		 

    A

    		 Compare ergosterol levels in fungus-contaminated seeds versus fresh seeds with no visible contamination.

    B

    		 Harvest seeds at various time points throughout the season and measure changes in ergosterol over time.

    C

    		 Transform fungal ergosterol-producing genes into plants and compare their ergosterol levels to the levels of unmodified plants.

    D

    		 Supply plants with Amphotericin B, an antifungal which targets ergosterol in membranes.



    Membrane Transport and Signalling | Prokaryotes |
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