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Directions: Complete BOTH Part A and Part B of this discussion. Part A: Using CH 23, please answer the question “What is an animal?” and then select one phyla discussed in this chapter to investigate. In your post, please discuss 2-3 important features of the phyla you select, identify an […]

Tay-Sachs disease is inherited as an autosomal recessive. It is a devastating neurological disease that results from the lack of a normal enzyme, hexosaminidase A, whose job is to metabolize lipids (gangliosides) that are found in brain cells. A young couple is told that they are carriers for this disease. […]

I use an affinity column to purify a protein, “X” from cell lysate. The specific activity of the protein is very low after this step. So I run the affinity-purified sample through an anion exchanger, and collect the early fraction. This eluate has very high specific activity. My results from […]

(a) L1 is a slide of a stained transverse section through a plant stem. This plant species is a native of Europe and parts of Asia. You are not expected to be familiar with this specimen. (b) Draw a large plan diagram of the quarter of the stem, as shown […]